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• Home Directory Folders

  - by George

  I am looking for a way to acomplish the following: Currently users have home drives mapped via AD profile as follow: \\fileserver\users\username However if once a user was able to access \\fileserver\users and view everyones folder, but had no access to them. This is not ideal since we have people saving important stuff to on their drives. How can I restrict users permissions and views only to THEIR home drives? I also saw this solution, but not sure if it would apply to me: ================================================================================ Share level permissions - Everyone full permission and remove all others On the file/folder level set the following: Authenticated users special permissions on the root of the \\server\homeshare\ to Check the boxes next to the following: Traverse folder / execute file List Folder / read data Read attributes Read extended attributes / List item All other boxed leave unchecked and make sure you apply "This Folder Only" Domain Adminsfull rights and apply “this folder, subfolders, and files” This will block the users from accessing other user home directories. When you create the new user and set the home directory it will create the folder for you with the correct permissions.

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• How do I add an Approver to SharePoint 2010?

  - by CompGeekess

  I am still new to SharePoint and am learning so much, but have came in to a few hic-ups and here is one. I want to add an approver to SharePoint 2010 who has FULL CONTROL. My manager requested that I find out where the approval request are going and redirect them to him. (I have no idea where or how to find this out). Is this possible to do on the Central Administration or must I go into each site/subsite and set him to be the approver this way? Googled and the site was showing me how to approve workflows or how to create approvals, my other resources didn't give much help either. So far I had gone into a few individual sites and set my manager and I up as approvers with full control, but am uncertain if this is the correct procedure or if there is a better way to do this. For example, have the lower levels inherit from the higher level - set security at the highest level and cascade to the child levels. Thank You.

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• Apache https is slow

  - by raucous12

  Hey, I've set apache up to use SSL with a self signed certificate. With https (KeepAlive on), I can get over 3000 requests per second. However, with https (KeepAlive off), I can only get 13 requests per second. I know there is supposed to be a bit of an overhead, but this seems abnormal. Can anyone suggest how I might go about debugging this. Here is the ab log for https: Server Software: Apache/2.2.3 Server Hostname: 127.0.0.1 Server Port: 443 SSL/TLS Protocol: TLSv1/SSLv3,DHE-RSA-AES256-SHA,4096,256 Document Path: /hello.html Document Length: 29 bytes Concurrency Level: 5 Time taken for tests: 30.49425 seconds Complete requests: 411 Failed requests: 0 Write errors: 0 Total transferred: 119601 bytes HTML transferred: 11919 bytes Requests per second: 13.68 [#/sec] (mean) Time per request: 365.565 [ms] (mean) Time per request: 73.113 [ms] (mean, across all concurrent requests) Transfer rate: 3.86 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 190 347 74.3 333 716 Processing: 0 14 24.0 1 166 Waiting: 0 11 21.6 0 165 Total: 191 361 80.8 345 716 Percentage of the requests served within a certain time (ms) 50% 345 66% 377 75% 408 80% 421 90% 468 95% 521 98% 578 99% 596 100% 716 (longest request)

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• Recovering database files from a corrupted VHD

  - by Apocalypse9

  We have a SQL server hosted on a virtual machine. Our hosting company updated/restarted the server and for some reason the virtual machines became unbootable. We've spoken to Microsoft and used a few higher level tools to attempt to recover the virtual machines but were unsuccessful. In browsing the file system the database folder doesn't even appear. I'm wondering if there are any lower level tools that might be able to find and copy the database files. As far as I know the physical hard drive is ok, so I'm hoping there may be some way to recover the files themselves even if the rest of the virtual machine file-system is a loss. Obviously we're in a bit of a bind, and any help/ suggestions are very much appreciated.

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• Remote Desktop Encryption

  - by Kumar

  My client is RDP 6.1 (On Windows XP SP3) and Server is Windows Server 2003. I have installed an SSL certificate on server for RDP. In the RDP settings (General tab), the Encryption method is set to SSL/TLS 1.0 and Encryption level is set to "Client Compatible". I have following questions In this case is it guaranteed that all communication is encrypted even when I remote login to the server? I mean pwd is encrypted Does RDP always use some kind of encryption even if there is no SSL certificate installed on the server? In this case I do not see security lock in the connection bar. When I set encryption level to "High" then I see security lock. I do believe that communication is both cases will be encrypted. Is it true? Please reply to my questions Thanks in advance Kumar

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• Limit a process's relative (not absolute) processor consumption in Linux

  - by BobBanana

  What is the standard way in Linux to enforce a system policy to limit the relative CPU use of a single process? That is, on a quad-core machine, I never want a process to use more than 2 CPUs at once, even if the process creates more threads. I do not want an absolute time limit, just a relative limit so that one task cannot dominate the machine. This is also different than renice, which allows a process to use all the resources but just politely step aside if others need them too. ulimit is the usual resource limiting tool, but it does not allow such CPU restrictions.. it can limit the number of processes per user, or absolute CPU time, not restrict the maximum number of active threads of a single process. I've found a couple of user-level tools, like CPUlimit, but not a system level tool or setting. Does such a standard resource controller exist in Linux (Red Hat Enterprise, if it matters.) If there is such a limit imposed, how would a user identify it?

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• Which RAM is faster (or, is Crucial's Memory Advisor giving non-optimal advice)?

  - by adpe

  In general, if a PC's motherboard is only specified for RAM up to a given core speed x, will that PC be faster with: RAM of latency y capable of running at a maximum core speed >x or RAM of latency <y capable of running at a maximum core speed of exactly x ? I would have thought the latter, but Crucial's Memory Adviser tool advises the former. So, which of us is correct - me, or the machine? (Here is a concrete example: I wish to upgrade a Toshiba Satellite Pro L300-155 laptop from its current 1GB RAM to 2GB Crucial RAM. The laptop's specifications are given here. I see from those specifications that the laptop is designed for DDR2-667 Ram. Crucial sells two compatible 2GB kits, priced exactly the same as each other: DDR2-667, CL=5; DDR2-800, CL=6. It seems to me that of these two upgrade kits, the first kit would run slightly faster on the L300-155 than the second, because both will presumably be capped at DDR2-667 core speed (see laptop specs), but the second kit has more latency. However, Crucial's Memory Advisor tool recommends the second kit.)

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• Which permissions need to be assigned to a normal user to allow him to change SHARE permissions?

  - by guest

  As in the subject - I am wondering, which permissions (if it is possible) do I need to assign to a regular user to modify the share permissions - e.g. to add another user with full control permissions, or to deny someone read access to the folder - on a share level. I know that this is possible through NTFS permissions, but I am wondering whether it is also possible on share level. Any ideas how to do that? Or perhaps only the adminstrator/creator/person who shared the folder has the access to this? I am using win2003 Any ideas? Thanks

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• How can I see if apache is overloaded and dropping or not accepting connections?

  - by cat pants

  Basically I just want to see if apache is handling a current level of high traffic or if I need to tune it to handle more connections. (I have found plenty of information on the actual tuning, so no help needed there) I know it has been dropping or not accepting connections earlier today, but not seeing anything in the error logs. Is the expected behavior to throw a 503 in the error log if apache cannot accept more connections? If so, what error logging level do I need in order to see these? What is the correct terminology: dropping connections or not accepting connections? MPM is prefork, OS is Linux, apache version is 2.2.15.

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• What are the recognized ways to increase the size of the RAID array online/offline?

  - by user149509

  Is it possible, in theory, increase the size of the RAID-array of any level just by adding new drive(s)? Variant like "backup whole data - delete old array - add/replace disks - create new array - restore data" is obvious so what are the other options? Does it depend on the RAID-level only or on the implementation of RAID-controller only, or on both? Adding new disks to a striped array necessarily leads to a rebuilding of the array with the redistribution of the strips to the new drives? What steps should be done to increase size of RAID-array in online/offline scenarios? Especially interesting RAID-5 and RAID-10. I would like to see the big picture.

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• Is it safe to set MySQL isolation to "Read Uncommitted" (dirty reads) for typical Web usage? Even with replication?

  - by Continuation

  I'm working on a website with typical CRUD web usage pattern: similar to blogs or forums where users create/update contents and other users read the content. Seems like it's OK to set the database's isolation level to "Read Uncommitted" (dirty reads) in this case. My understanding of the general drawback of "Read Uncommitted" is that a reader may read uncommitted data that will later be rollbacked. In a CRUD blog/forum usage pattern, will there ever be any rollback? And even if there is, is there any major problem with reading uncommitted data? Right now I'm not using any replication, but in the future if I want to use replication (row-based, not statement-based) will a "Read Uncommitted" isolation level prevent me from doing so? What do you think? Has anyone tried using "Read Uncommitted" on their RDBMS?

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• Why does my router log crazy amounts of blocked traffic on port 1701?

  - by Vlad Seghete

  I have a 2701HGV-B 2Wire modem and router (AT&T). The log is basically full with entries similar to the following with a time between a fifth and a third of a second between entries: src=86.156.7.170 dst=xxx.xxx.xxx.38 ipprot=17 sport=6882 dport=1701 Unknown inbound session stopped src=58.176.22.252 dst=xxx.xxx.xxx.38 ipprot=17 sport=21573 dport=1701 Unknown inbound session stopped src=91.221.6.250 dst=xxx.xxx.xxx.38 ipprot=17 sport=25902 dport=1701 Unknown inbound session stopped ... where the source IP will be different for every entry. The entries accumulate constantly, every single second that the router is on several of them appear in the log. The destination is the WAN address for my router. I understand that this is somehow related to VNCs, but I don't know enough to figure out why my router is getting bombarded with requests for a VNC session. Is there anything fishy going on or is this normal? If it is normal, how do I keep these entries from spamming my log files? Since there's about two or three of them every second, everything else gets drowned out.

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• Informaton of pendriver with libudv on linux

  - by Catanzaro

  I'm doing a little app in C that read the driver information of my pendrive: Plugged it and typed dmesg: [ 7676.243994] scsi 7:0:0:0: Direct-Access Lexar USB Flash Drive 1100 PQ: 0 ANSI: 0 CCS [ 7676.248359] sd 7:0:0:0: Attached scsi generic sg2 type 0 [ 7676.256733] sd 7:0:0:0: [sdb] 7831552 512-byte logical blocks: (4.00 GB/3.73 GiB) [ 7676.266559] sd 7:0:0:0: [sdb] Write Protect is off [ 7676.266566] sd 7:0:0:0: [sdb] Mode Sense: 43 00 00 00 [ 7676.266569] sd 7:0:0:0: [sdb] Assuming drive cache: write through [ 7676.285373] sd 7:0:0:0: [sdb] Assuming drive cache: write through [ 7676.285383] sdb: sdb1 [ 7676.298661] sd 7:0:0:0: [sdb] Assuming drive cache: write through [ 7676.298667] sd 7:0:0:0: [sdb] Attached SCSI removable disk with "udevadm info -q all -n /dev/sdb" P: /devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1/1-1:1.0/host7/target7:0:0/7:0:0:0/block/sdb N: sdb W: 36 S: block/8:16 S: disk/by-id/usb-Lexar_USB_Flash_Drive_AA5OCYQII8PSQXBB-0:0 S: disk/by-path/pci-0000:02:03.0-usb-0:1:1.0-scsi-0:0:0:0 E: UDEV_LOG=3 E: DEVPATH=/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1/1-1:1.0/host7/target7:0:0/7:0:0:0/block/sdb E: MAJOR=8 E: MINOR=16 E: DEVNAME=/dev/sdb E: DEVTYPE=disk E: SUBSYSTEM=block E: ID_VENDOR=Lexar E: ID_VENDOR_ENC=Lexar\x20\x20\x20 E: ID_VENDOR_ID=05dc E: ID_MODEL=USB_Flash_Drive E: ID_MODEL_ENC=USB\x20Flash\x20Drive\x20 E: ID_MODEL_ID=a813 E: ID_REVISION=1100 E: ID_SERIAL=Lexar_USB_Flash_Drive_AA5OCYQII8PSQXBB-0:0 E: ID_SERIAL_SHORT=AA5OCYQII8PSQXBB E: ID_TYPE=disk E: ID_INSTANCE=0:0 E: ID_BUS=usb E: ID_USB_INTERFACES=:080650: E: ID_USB_INTERFACE_NUM=00 E: ID_USB_DRIVER=usb-storage E: ID_PATH=pci-0000:02:03.0-usb-0:1:1.0-scsi-0:0:0:0 E: ID_PART_TABLE_TYPE=dos E: UDISKS_PRESENTATION_NOPOLICY=0 E: UDISKS_PARTITION_TABLE=1 E: UDISKS_PARTITION_TABLE_SCHEME=mbr E: UDISKS_PARTITION_TABLE_COUNT=1 E: DEVLINKS=/dev/block/8:16 /dev/disk/by-id/usb-Lexar_USB_Flash_Drive_AA5OCYQII8PSQXBB-0:0 /dev/disk/by-path/pci-0000:02:03.0-usb-0:1:1.0-scsi-0:0:0:0 and my software is: Codice: Seleziona tutto #include <stdio.h> #include <libudev.h> #include <stdlib.h> #include <locale.h> #include <unistd.h> int main(void) { struct udev_enumerate *enumerate; struct udev_list_entry *devices, *dev_list_entry; struct udev_device *dev; /* Create the udev object */ struct udev *udev = udev_new(); if (!udev) { printf("Can't create udev\n"); exit(0); } enumerate = udev_enumerate_new(udev); udev_enumerate_add_match_subsystem(enumerate, "scsi_generic"); udev_enumerate_scan_devices(enumerate); devices = udev_enumerate_get_list_entry(enumerate); udev_list_entry_foreach(dev_list_entry, devices) { const char *path; /* Get the filename of the /sys entry for the device and create a udev_device object (dev) representing it */ path = udev_list_entry_get_name(dev_list_entry); dev = udev_device_new_from_syspath(udev, path); /* usb_device_get_devnode() returns the path to the device node itself in /dev. */ printf("Device Node Path: %s\n", udev_device_get_devnode(dev)); /* The device pointed to by dev contains information about the hidraw device. In order to get information about the USB device, get the parent device with the subsystem/devtype pair of "usb"/"usb_device". This will be several levels up the tree, but the function will find it.*/ dev = udev_device_get_parent_with_subsystem_devtype( dev, "block", "disk"); if (!dev) { printf("Errore\n"); exit(1); } /* From here, we can call get_sysattr_value() for each file in the device's /sys entry. The strings passed into these functions (idProduct, idVendor, serial, etc.) correspond directly to the files in the directory which represents the USB device. Note that USB strings are Unicode, UCS2 encoded, but the strings returned from udev_device_get_sysattr_value() are UTF-8 encoded. */ printf(" VID/PID: %s %s\n", udev_device_get_sysattr_value(dev,"idVendor"), udev_device_get_sysattr_value(dev, "idProduct")); printf(" %s\n %s\n", udev_device_get_sysattr_value(dev,"manufacturer"), udev_device_get_sysattr_value(dev,"product")); printf(" serial: %s\n", udev_device_get_sysattr_value(dev, "serial")); udev_device_unref(dev); } /* Free the enumerator object */ udev_enumerate_unref(enumerate); udev_unref(udev); return 0; } the problem is that i obtain in output: Device Node Path: /dev/sg0 Errore and dont view information. subsystem and the devtype i think that are inserted well : "block" and "disk". thanks for help. Bye

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• Galaxy Tab 3 producing continuous LightSensor error in LogCat

  - by Richard Tingle

  I am using a Galaxy Tab 3 as a test device for writing an android app. As such I'm interested in the output of the LogCat which is being filled with these error level messages. The device itself appears to work correctly, apps which rely on the light sensor correctly respond to it and the number in the error itself goes down if the light sensor is obscured. If I wasn't using it to develop apps I wouldn't even be aware of the issue but I believe it is an issue with the device itself not my app: simply plugging the tab 3 into the computer and using Eclipse - ADT to look at the LogCat without any app running leads to these errors being shown. I know I could filter the LogCat to ignore these errors but inconvenience aside; they concern me. A sample of the log cat is below (it generates errors continuously). This is on verbose so it includes some debug level (D/) messages as well as the error level messages (E/). How can I correct the device to no longer generate these errors. 06-11 10:08:45.789: E/LightSensor(377): LightSensor::readEvents mPendingEvent.light = 14 06-11 10:08:45.992: E/LightSensor(377): LightSensor::readEvents mPendingEvent.light = 14 06-11 10:08:46.195: E/LightSensor(377): LightSensor::readEvents mPendingEvent.light = 14 06-11 10:08:46.398: E/LightSensor(377): LightSensor::readEvents mPendingEvent.light = 14 06-11 10:08:46.601: E/LightSensor(377): LightSensor::readEvents mPendingEvent.light = 14 06-11 10:08:46.804: E/LightSensor(377): LightSensor::readEvents mPendingEvent.light = 14 06-11 10:08:47.007: E/LightSensor(377): LightSensor::readEvents mPendingEvent.light = 14 06-11 10:08:47.210: E/LightSensor(377): LightSensor::readEvents mPendingEvent.light = 14 06-11 10:08:47.414: E/LightSensor(377): LightSensor::readEvents mPendingEvent.light = 14 06-11 10:08:47.617: E/LightSensor(377): LightSensor::readEvents mPendingEvent.light = 14 06-11 10:08:47.820: E/LightSensor(377): LightSensor::readEvents mPendingEvent.light = 14 06-11 10:08:48.023: E/LightSensor(377): LightSensor::readEvents mPendingEvent.light = 14 06-11 10:08:48.039: D/dalvikvm(15201): GC_CONCURRENT freed 1947K, 17% free 16973K/20359K, paused 13ms+13ms, total 50ms 06-11 10:08:48.226: E/LightSensor(377): LightSensor::readEvents mPendingEvent.light = 14 06-11 10:08:48.429: E/LightSensor(377): LightSensor::readEvents mPendingEvent.light = 13 06-11 10:08:48.632: E/LightSensor(377): LightSensor::readEvents mPendingEvent.light = 13 06-11 10:08:48.632: D/STATUSBAR-NetworkController(472): refreshSignalCluster: data=0 bt=false 06-11 10:08:48.835: E/LightSensor(377): LightSensor::readEvents mPendingEvent.light = 14 06-11 10:08:49.039: E/LightSensor(377): LightSensor::readEvents mPendingEvent.light = 14 06-11 10:08:49.242: E/LightSensor(377): LightSensor::readEvents mPendingEvent.light = 14 06-11 10:08:49.445: E/LightSensor(377): LightSensor::readEvents mPendingEvent.light = 13 06-11 10:08:49.632: D/STATUSBAR-NetworkController(472): refreshSignalCluster: data=0 bt=false 06-11 10:08:49.648: E/LightSensor(377): LightSensor::readEvents mPendingEvent.light = 14 06-11 10:08:49.851: E/LightSensor(377): LightSensor::readEvents mPendingEvent.light = 13

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• Kill child process when the parent exits

  - by kolypto

  I'm preparing a script for Docker, which allows only one top-level process, which should receive the signals so we can stop it. Therefore, I'm having a script like this: one application writes to syslog (bash script in this sample), and the other one just prints it. #! /usr/bin/env bash set -eu tail -f /var/log/syslog & exec bash -c 'while true ; do logger aaaaaaaaaaaaaaaaaaa ; sleep 1 ; done' Almost solved: when the top-level process bash gets SIGTERM -- it exists, but tail -f continues to run. How do I instruct tail -f to exit when the parent process exits? E.g. it should also get the signal. Note: Can't use bash traps since exec on the last line replaces the process completely.

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• Hungry hungry BIOS: why do I have less than 4 GiB of memory?

  - by Rhymoid

  I thought I had 4 GiB of memory, but just to be sure, let's ask the BIOS about that: ?: sudo dmidecode --type 20 # dmidecode 2.12 SMBIOS 2.6 present. Handle 0x000B, DMI type 20, 19 bytes Memory Device Mapped Address Starting Address: 0x00000000000 Ending Address: 0x0007FFFFFFF Range Size: 2 GB Physical Device Handle: 0x000A Memory Array Mapped Address Handle: 0x000E Partition Row Position: Unknown Interleave Position: Unknown Interleaved Data Depth: Unknown Handle 0x000D, DMI type 20, 19 bytes Memory Device Mapped Address Starting Address: 0x00080000000 Ending Address: 0x000FFFFFFFF Range Size: 2 GB Physical Device Handle: 0x000C Memory Array Mapped Address Handle: 0x000E Partition Row Position: Unknown Interleave Position: Unknown Interleaved Data Depth: Unknown Alright, 4 GiB it is. But I can't use all of it: ?: cat /proc/meminfo | head -n 1 MemTotal: 3913452 kB Somehow, somewhere, I lost 274 MiB. Where did 6% of my memory go? Now I know the address ranges in DMI are incorrect, because the ACPI memory map reports usable ranges well beyond the ending address of the second memory module: ?: dmesg | grep -E "BIOS-e820: .* usable" [ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009e7ff] usable [ 0.000000] BIOS-e820: [mem 0x0000000000100000-0x00000000dee7bfff] usable [ 0.000000] BIOS-e820: [mem 0x0000000100000000-0x0000000117ffffff] usable I get pretty much the same info from /proc/iomem (except for the 4 kiB hole 0x000-0xFFF), which also shows that the kernel only accounts for less than 8 MiB. I guess 0x00000000-0x7FFFFFFF is indeed mapped to the first memory module, and 0x80000000-0xDFFFFFFF to part of the second memory module (a bunch of ACPI NVS things live between 0xDEE7C000 and 0xDEF30FFF, and the remaining 16-something MiB of that range are just 'reserved'). I guess the highest 0x18000000 bytes of the second memory module are mapped above the 4 GiB mark. But even then, there are two problems: 128 MiB (0x08000000 bytes, living somewhere between 0xE0000000 and 0xFFFFFFFF) are still completely unaccounted for. To note, my graphics card is on PCI-Express and (allegedly) has 1 GiB dedicated memory, so that shouldn't be the culprit. Did the BIOS screw up in moving the memory, leaving it partially shadowed by MMIO? Even with this mediocre explanation, I only 'found' 128 MiB. But /proc/meminfo is reporting a much larger deficit; where's the other 146 MiB? How does Linux count MemTotal?

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• Tomcat directly serve static (css, js) files shared by multiple applications

  - by Josvic Zammit

  I'm using the ExtJS framework which has a bulk of js and css files that are used for all apps. I intend to share these between a number of web applications (different war files). For this reason I would like to serve ExtJS js and css directly from the web server, in my case Tomcat6, which can be used to serve static files, as in this helpful link. Therefore I put my files under /var/lib/tomcat6/webapps/ROOT/extjs/. The static files that are directly under that directory are served correctly, e.g. /extjs/ext.js correctly serves the file at /var/lib/tomcat6/webapps/ROOT/extjs/ext.js. However files in lower-level directories, for example /extjs/welcome/css/welcome.css, which should serve the file at /var/lib/tomcat6/webapps/ROOT/extjs/welcome/css/welcome.css, return a 404. TL/DR Tomcat serves static files only at top-level directory. A 404 is returned for files deeper in the hierarchy. Config file contents: server.xml application's web.xml

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• Accessing a broken mdadm raid

  - by CarstenCarsten

  Hi! I used a western digital mybookworld (SOHO NAS storage using Linux) as backup for my Linux box. Suddenly, the mybookworld does not boot up any more. So I opened the box, removed the hard disk and put the hard disk into an external USB HDD case, and connected it to my Linux box. [ 530.640301] usb 2-1: new high speed USB device using ehci_hcd and address 3 [ 530.797630] scsi7 : usb-storage 2-1:1.0 [ 531.794844] scsi 7:0:0:0: Direct-Access WDC WD75 00AAKS-00RBA0 PQ: 0 ANSI: 2 [ 531.796490] sd 7:0:0:0: Attached scsi generic sg3 type 0 [ 531.797966] sd 7:0:0:0: [sdc] 1465149168 512-byte logical blocks: (750 GB/698 GiB) [ 531.800317] sd 7:0:0:0: [sdc] Write Protect is off [ 531.800327] sd 7:0:0:0: [sdc] Mode Sense: 38 00 00 00 [ 531.800333] sd 7:0:0:0: [sdc] Assuming drive cache: write through [ 531.803821] sd 7:0:0:0: [sdc] Assuming drive cache: write through [ 531.803836] sdc: sdc1 sdc2 sdc3 sdc4 [ 531.815831] sd 7:0:0:0: [sdc] Assuming drive cache: write through [ 531.815842] sd 7:0:0:0: [sdc] Attached SCSI disk The dmesg output looks normal, but I was wondering why the hardisk was not mounted at all. And why there are 4 different partitions on it. fdisk showed the following: root@ubuntu:/home/ubuntu# fdisk /dev/sdc WARNING: DOS-compatible mode is deprecated. It's strongly recommended to switch off the mode (command 'c') and change display units to sectors (command 'u'). Command (m for help): p Disk /dev/sdc: 750.2 GB, 750156374016 bytes 255 heads, 63 sectors/track, 91201 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00007c00 Device Boot Start End Blocks Id System /dev/sdc1 4 369 2939895 fd Linux raid autodetect /dev/sdc2 370 382 104422+ fd Linux raid autodetect /dev/sdc3 383 505 987997+ fd Linux raid autodetect /dev/sdc4 506 91201 728515620 fd Linux raid autodetect Oh no! Everything seems to be created as a mdadm software raid. Calling mdadm --examine with the different partitions seems to affirm that. I think the only partition I am interested in, is /dev/sdc4 (because it is the largest). But nevertheless I called mdadm --examine with every partition. root@ubuntu:/home/ubuntu# mdadm --examine /dev/sdc1 /dev/sdc1: Magic : a92b4efc Version : 00.90.00 UUID : 5626a2d8:070ad992:ef1c8d24:cd8e13e4 Creation Time : Wed Feb 20 00:57:49 2002 Raid Level : raid1 Used Dev Size : 2939776 (2.80 GiB 3.01 GB) Array Size : 2939776 (2.80 GiB 3.01 GB) Raid Devices : 2 Total Devices : 1 Preferred Minor : 1 Update Time : Sun Nov 21 11:05:27 2010 State : clean Active Devices : 1 Working Devices : 1 Failed Devices : 1 Spare Devices : 0 Checksum : 4c90bc55 - correct Events : 16682 Number Major Minor RaidDevice State this 0 8 1 0 active sync /dev/sda1 0 0 8 1 0 active sync /dev/sda1 1 1 0 0 1 faulty removed root@ubuntu:/home/ubuntu# mdadm --examine /dev/sdc2 /dev/sdc2: Magic : a92b4efc Version : 00.90.00 UUID : 9734b3ee:2d5af206:05fe3413:585f7f26 Creation Time : Wed Feb 20 00:57:54 2002 Raid Level : raid1 Used Dev Size : 104320 (101.89 MiB 106.82 MB) Array Size : 104320 (101.89 MiB 106.82 MB) Raid Devices : 2 Total Devices : 1 Preferred Minor : 2 Update Time : Wed Oct 27 20:19:08 2010 State : clean Active Devices : 1 Working Devices : 1 Failed Devices : 1 Spare Devices : 0 Checksum : 55560b40 - correct Events : 9884 Number Major Minor RaidDevice State this 0 8 2 0 active sync /dev/sda2 0 0 8 2 0 active sync /dev/sda2 1 1 0 0 1 faulty removed root@ubuntu:/home/ubuntu# mdadm --examine /dev/sdc3 /dev/sdc3: Magic : a92b4efc Version : 00.90.00 UUID : 08f30b4f:91cca15d:2332bfef:48e67824 Creation Time : Wed Feb 20 00:57:54 2002 Raid Level : raid1 Used Dev Size : 987904 (964.91 MiB 1011.61 MB) Array Size : 987904 (964.91 MiB 1011.61 MB) Raid Devices : 2 Total Devices : 1 Preferred Minor : 3 Update Time : Sun Nov 21 11:05:27 2010 State : clean Active Devices : 1 Working Devices : 1 Failed Devices : 1 Spare Devices : 0 Checksum : 39717874 - correct Events : 73678 Number Major Minor RaidDevice State this 0 8 3 0 active sync 0 0 8 3 0 active sync 1 1 0 0 1 faulty removed root@ubuntu:/home/ubuntu# mdadm --examine /dev/sdc4 /dev/sdc4: Magic : a92b4efc Version : 00.90.00 UUID : febb75ca:e9d1ce18:f14cc006:f759419a Creation Time : Wed Feb 20 00:57:55 2002 Raid Level : raid1 Used Dev Size : 728515520 (694.77 GiB 746.00 GB) Array Size : 728515520 (694.77 GiB 746.00 GB) Raid Devices : 2 Total Devices : 1 Preferred Minor : 4 Update Time : Sun Nov 21 11:05:27 2010 State : clean Active Devices : 1 Working Devices : 1 Failed Devices : 1 Spare Devices : 0 Checksum : 2f36a392 - correct Events : 519320 Number Major Minor RaidDevice State this 0 8 4 0 active sync 0 0 8 4 0 active sync 1 1 0 0 1 faulty removed If I read the output correctly everything was removed, because it was faulty. Is there ANY way to see the contents of the largest partition? Or seeing somehow which files are broken? I see that everything is raid1 which is only mirroring, so this should be a normal partition. I am anxious to do anything with mdadm, in fear that I destroy the data on the hard disk. I would be very thankful for any help.

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• Amazon S3 - Storage Class and Server Side Encryption

  - by Steven

  Ahhh! I am using Amazon S3 for some low price storage to clear down out SAN. I created the bucket and created a root folder. I set the storage class to standard and server side encryption AES. I started a copy job to move the files, some files copied over and i checked the files: Reduced Redundancy Encryption set to none WTF? So i deleted all files and folders. I manuallyed created the folder structure and again set the storage class and encryption level. I coped some files and bamm, still showing (at a file level as Reduced and no encryption). So my question is this, is it really raid'd and encrypted just not showing it properly (as the root folder is, how can the file not be??) or (b) am i being a huge tool and missing something?

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• htaccess rewriting all subdomains to subdirectories

  - by indorock

  I'm trying to build a catch-all for any subdomains (not captured by previous rewrite rules) for a certain domain, and serve a website from a subdirectory that resides in the same folder as the .htaccess file. I already have my vhosts.conf to send all unmapped requests to a "playground" folder, where I want to easily create new subdomains by simply adding a subfolder. So, my structure looks like this: /var/www/playground |-> /foo |-> /bar The .htacces living inside the /playground folder and /foo and /bar being seperate websites. I want http://foo.domain.com to point to /foo and http://bar.domain.com to /bar. Here is my .htaccess file: RewriteEngine On RewriteCond %{HTTP_HOST} ^([^.]+).domain.com$ [NC] RewriteCond %{REQUEST_URI} !^/%1/(.*) RewriteRule ^(.*) /%1/$1 [L] This is supposed to capture the subdomain, add it as a subfolder in RewriteRule, then append after the slash and path information. The second RewriteCond is there to prevent an infinite loop. My idea was that %1 in the second RewriteCond would be able to capture the capture group in the first RewriteCond. But so far I haven't had any success, it's always ending up in a redirect loop. If I would replace %1 in the second RewriteCond with hardcoded 'foo' or 'bar', it works, which leads me to believe that you cannot refer to a capture group inside a RewriteCond. Is is true? Or am I missing something?

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• Nightly backups (and maybe other tasks) causing server alerts

  - by J. Pablo Fernández

  I have two independent alert notification systems for my servers. The server is a virtual machine on Linode and one of the alerts comes from Linode. The other monitoring system we use is New Relic. They are both watching out for IO utilization. Every night I get alerts from both of them as the server is using too much IO. I run quite a few tasks in the middle of the night but the one I confirmed that can cause IO-warnings is running the backups. The backup is done by s3cmd sync. I tried ionice but it still generates the warnings. Getting warnings every night reduces the efficacy of warnings when they happen for real. For Linode I could raise the level at which a warning is issued, but it might mean making the whole thing useless as the level is too high. What would be the proper solution for this?

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• Determining percentage of students between certain grades

  - by dunc

  I have an Excel spreadsheet with the following data: #-----------------------------------------------------------------------------------------------------------------------------------# # Student # KS2 Grade # Target # Expected 1 # Expected 2 # Expected 3 # FSM Status # Gifted & Talented # #-----------------------------------------------------------------------------------------------------------------------------------# # User 1 # 4 # 6 # 7 # 5 # 6 # Y # N # # User 2 # 3 # 5 # 5 # 4 # 4 # N # N # # User 3 # 5 # 6 # 6 # 6 # 7 # N # N # # User 4 # 4 # 6 # 5 # 6 # 6 # N # Y # # User 5 # 5 # 7 # 7 # 6 # 7 # N # N # # User 6 # 3 # 4 # 4 # 4 # 4 # N # N # # User 7 # 3 # 4 # 5 # 3 # 4 # Y # Y # #-----------------------------------------------------------------------------------------------------------------------------------# What I'd like to do is determine the percentage of students with certain levels, i.e. a range of levels. For instance, in the data above, I'd like to determine the % of all students that have a Target level of 5 - 7. I'd then like to also expand the formula to specify % of Gifted & Talented students with a Target level of 5 - 7. Is this possible in Excel? If so, where do I start?

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• Restore only one partition of Windows Backup

  - by VitoShadow

  I have a MacBook Pro with an HD partitioned. This HD was divided in two partitions: the first was about 650 GB, with OS X installed, and the second one (created with BootCamp Assistant) was about 100 GB, with Windows 7 installed. I needed more space for Windows, so I decided to backup the Windows partition using the Windows backup tool, from Control Panel. I created an image of my partition, stored it in an external HD, and now I'm trying to use it. In order to give more space to Windows, I formatted the HD, and recreate a new partition table, with the first partition of about 250 GB (with OS X) and the second of the exactly size of the previous partition in which was installed Windows (about 100 GB); thre rest was empty space. In the second, I tried to restore the Windows backup. I plugged in the Windows Installation CD (with the HD with the backup connected to the computer), and select the option "Repair your computer". Then, I choose the image of the backup (automatically recognized), and I try to restore it. The problem is that now the System Recovery Tool wants to format all the HD, in order to install only Windows! In this way, I should lose everything, also the MacOS partition! Is there a way to install the backup only in the Windows partition?

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• Mysql: Working With 192 Trillion Records... (Yes, 192 Trillion)

  - by Sarah

  Here's the question... Considering 192 trillion records, what should my considerations be? My main concern is speed. Here's the table... CREATE TABLE `ref` ( `id` INTEGER(13) AUTO_INCREMENT DEFAULT NOT NULL, `rel_id` INTEGER(13) NOT NULL, `p1` INTEGER(13) NOT NULL, `p2` INTEGER(13) DEFAULT NULL, `p3` INTEGER(13) DEFAULT NULL, `s` INTEGER(13) NOT NULL, `p4` INTEGER(13) DEFAULT NULL, `p5` INTEGER(13) DEFAULT NULL, `p6` INTEGER(13) DEFAULT NULL, PRIMARY KEY (`id`), KEY (`s`), KEY (`rel_id`), KEY (`p3`), KEY (`p4`) ); Here's the queries... SELECT id, s FROM ref WHERE red_id="$rel_id" AND p3="$p3" AND p4="$p4" SELECT rel_id, p1, p2, p3, p4, p5, p6 FROM ref WHERE id="$id" INSERT INTO rel (rel_id, p1, p2, p3, s, p4, p5, p6) VALUES ("$rel_id", "$p1", "$p2", "$p3", "$s", "$p4", "$p5", "$p6") Here's some notes... The SELECT's will be done much more frequently than the INSERT. However, occasionally I want to add a few hundred records at a time. Load-wise, there will be nothing for hours then maybe a few thousand queries all at once. Don't think I can normalize any more (need the p values in a combination) The database as a whole is very relational. This will be the largest table by far (next largest is about 900k) UPDATE (08/11/2010) Interestingly, I've been given a second option... Instead of 192 trillion I could store 2.6*10^16 (15 zeros, meaning 26 Quadrillion)... But in this second option I would only need to store one bigint(18) as the index in a table. That's it - just the one column. So I would just be checking for the existence of a value. Occasionally adding records, never deleting them. So that makes me think there must be a better solution then mysql for simply storing numbers... Given this second option, should I take it or stick with the first... [edit] Just got news of some testing that's been done - 100 million rows with this setup returns the query in 0.0004 seconds [/edit]

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• SQL SERVER – Generate Report for Index Physical Statistics – SSMS

  - by pinaldave

  Few days ago, I wrote about SQL SERVER – Out of the Box – Activity and Performance Reports from SSSMS (Link). A user asked me a question regarding if we can use similar reports to get the detail about Indexes. Yes, it is possible to do the same. There are similar type of reports are available at Database level, just like those available at the Server Instance level. You can right click on Database name and click Reports. Under Standard Reports, you will find following reports. Disk Usage Disk Usage by Top Tables Disk Usage by Table Disk Usage by Partition Backup and Restore Events All Transactions All Blocking Transactions Top Transactions by Age Top Transactions by Blocked Transactions Count Top Transactions by Locks Count Resource Locking Statistics by Objects Object Execute Statistics Database Consistency history Index Usage Statistics Index Physical Statistics Schema Change history User Statistics Select the Reports with name Index Physical Statistics. Once click, a report containing all the index names along with other information related to index will be visible, e.g. Index Type and number of partitions. One column that caught my interest was Operation Recommended. In some place, it suggested that index needs to be rebuilt. It is also possible to click and expand the column of partitions and see additional details about index as well. DBA and Developers who just want to have idea about how your index is and its physical statistics can use this tool. Click to Enlarge Note: Please note that I will rebuild my indexes just because this report is recommending it. There are many other parameters you need to consider before rebuilding indexes. However, this tool gives you the accurate stats of your index and it can be right away exported to Excel or PDF writing by clicking on the report. Reference : Pinal Dave (http://blog.SQLAuthority.com) Filed under: Pinal Dave, SQL, SQL Authority, SQL Index, SQL Optimization, SQL Performance, SQL Query, SQL Server, SQL Server Management Studio, SQL Tips and Tricks, SQL Utility, T SQL, Technology

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