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  • I get an "serious errors while checking the disk drives for /boot" error while booting

    - by Vaios Argiropoulos
    I have just set up my new system by creating three partitions on a whole hard disk (/boot,/home,swap and /(root)) .I saw this article and now i am getting those errors and the system provide me with some options (I to ignore, S to skip mounting or M for manual recovery). I am forced to choose skip mounting because i don't know what manual recovery is. Despite the error i get i think that the system boots ok because i can use the system but this error is very annoying.

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  • "No caching mode page present" when USB flash disk attached

    - by evgeny9
    When attaching a USB flash disk (NTFS formatted) to a laptop with Ubuntu Server 12.04 on board, I get following messages: [ 3572.355603] sd 2:0:0:0: [sdb] No Caching mode page present [ 3572.355640] sd 2:0:0:0: [sdb] Assuming drive cache: write through [ 3572.361599] sd 2:0:0:0: [sdb] No Caching mode page present [ 3572.361636] sd 2:0:0:0: [sdb] Assuming drive cache: write through I get them right in the terminal, so that I should press Ctrl+C to proceed with working (entering commands). Is it normal or do I have to setup Caching mode somehow? Thank you.

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  • Create a Monitoring Server for SQL Server with PowerShell

    At some point you are going to need a notification system for a range of events that occur in your servers. Laerte Junior shows how you can even set up temporary or permanent alerts for any WMI events to give you a system that fits your server environment perfectly. Get Smart with SQL Backup Pro Powerful centralised management, encryption and more.SQL Backup Pro was the smartest kid at school Discover why.

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  • process monitoring in c under linux

    - by poly
    I'm trying to write a multi threaded/processes application and it need to know how to monitor a process from another process all the time. So here is what I have, I have a 2 processes, each with multiple threads that handle the network part, then another 2 process also with multiple threads that interact with DB and with the network processes, what I need to do is that if for example one of the network processes goes down the DB process start sending to the live network process until the second one is up again. I'm using fifo between the DB and the network process. I was thinking of sending messages with message passing all the time but not sure whether this is a good idea or I need to use some other IPC for this issue, or probably neither is good and I need to use entirely something else? Thanks,

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  • Process monitoring in Linux environment?

    - by poly
    I'm trying to write a multi threaded/processes application and it need to know how to monitor a process from another process all the time. So here is what I have, I have a 2 processes, each with multiple threads that handle the network part, then another 2 process also with multiple threads that interact with DB and with the network processes, what I need to do is that if for example one of the network processes goes down the DB process start sending to the live network process until the second one is up again. I'm using fifo between the DB and the network process. I was thinking of sending messages with message passing all the time but not sure whether this is a good idea or I need to use some other IPC for this issue, or probably neither is good and I need to use entirely something else?

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  • CPU and Scheduler Performance Monitoring using SQL Server and Excel

    This article will demonstrate a method of creating an Excel-based CPU/scheduler performance dashboard for SQL Server 2005+. NEW! Deployment Manager Early Access ReleaseDeploy SQL Server changes and .NET applications fast, frequently, and without fuss, using Deployment Manager, the new tool from Red Gate. Try the Early Access Release to get a 20% discount on Version 1. Download the Early Access Release.

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  • Simple VM That allows booting from folder or disk

    - by None
    I was wondering if there was a very simple and free virtual machine that would allow you to boot from a folder or disk image that couldn't damage my hard disk. I am using a MacBook and am looking into operating system programming. I found a tutorial on the internet that looked promising (http://www.viralpatel.net/taj/tutorial/hello_world_bootloader.php). I want to try this but using a VM instead of actually booting from a disk. If I made a folder or disk image containing the boot.bin file and wanted to try the OS I made (while booting from a folder or disk image, not a disk), is there a VM that would let me do it? I have no previous experience with virtual machines. I also want to be sure my hard disk would not be damaged.

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  • Need data on disk drive management by OS: getting base I/O unit size, “sync” option, Direct Memory A

    - by Richard T
    Hello All, I want to ensure I have done all I can to configure a system's disks for serious database use. The three areas I know of (any others?) to be concerned about are: I/O size: the database engine and disk's native size should either match, or the database's native I/O size should be a multiple of the disk's native I/O size. Disks that are capable of Direct Memory Access (eg. IDE) should be configured for it. When a disk says it has written data persistently, it must be so! No keeping it in cache and lying about it. I have been looking for information on how to ensure these are so for CENTOS and Ubuntu, but can't seem to find anything at all! I want to be able to check these things and change them if needed. Any and all input appreciated.

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  • MRTG Monitoring of Disk

    - by Antitribu
    I am trying to monitor Disk usage over SNMP using MRTG on CentOS5.2. I'm open to any suggestions as to the best way to achieve this (I would also like to do other metrics like CPU). Please don't assume I know anything about MRTG. I am using the following config: LoadMIBs: /usr/share/snmp/mibs/UCD-SNMP-MIB.txt,/usr/share/snmp/mibs/TCP-MIB.txt workdir: /var/www/html/mrtg/temp/ # # Disk Usage Monitoring # Target[servername.]: dskPercent.0&dskPercent.0:[email protected] Title[servername.]: / on servername routers.cgi*Desc[servername.]: / on servername routers.cgi*ShortDesc[servername.]: / MaxBytes[servername.]: 100 AbsMax[servername.]: 100 Options[servername.]: growright,nopercent,gauge YLegend[servername.]: used disk space ShortLegend[servername.]: % used Legend1[servername.]: usage Legend2[servername.]: usage Legend3[servername.]: peak usage Legend4[servername.]: peak usage LegendI[servername.]: usage LegendO[servername.]: usage routers.cgi*Icon[servername.]: disk-sm.gif routers.cgi*Options[servername.]: noo,nomax,noabsmax Unscaled[servername.]: dwmy I receive the errors: Unknown SNMP var dskPercent.0 at /usr/bin/mrtg line 2035 Unknown SNMP var dskPercent.0 at /usr/bin/mrtg line 2035 From forum surfing etc the suggestion is to use the fully qualified OIDs, I'd like to avoid this (for readability). So essentially I'm wondering where can I find a mib file compatible with mrtg for it's reference or a working config file.

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  • Why does 12.04 upgrade abort with out of space error when I have lots of it?

    - by Kristian Thomsen
    When upgrading Ubuntu from 11.10 to 12.04 I discovered an unexpected problem. The upgrade was stopped because there wasn't enough free space for the installation. I managed to free some space and do the upgrade but now a prompt appears after logging in saying I'm out of space. This prompt asks me if I want to examine the problem. The "Disk Usage Analyser" is opened. In the top it says: Total filesystem capacity: 47.0 GB (used: 13.5 GB available: 33.4 GB) Folder -- Usage -- Size / -- 100% -- 12.5 GB usr -- 44.8 % -- 5.6 GB home -- 30.3 % -- 3.8 GB lib -- 13.0 % -- 1.6 GB var -- 9.1 % -- 1.1 GB boot 2.5 % 309.5 GB and a lot of small contributors like: etc, opt, sbin, bin etc. I do not really understand this problem since the analyser in the top says that I have 33.4 GB left in this file system. What can I do to make Ubuntu use the remaining space? Running df -i in the terminal gives: Filesystem Inodes IUsed IFree IUse% Mounted on /dev/sda7 610800 576874 33926 95% / udev 213451 563 212888 1% /dev tmpfs 218524 486 218038 1% /run none 218524 3 218521 1% /run/lock none 218524 7 218517 1% /run/shm /dev/sda8 2264752 16371 2248381 1% /home The output of df -h Filesystem Size Used Avail Use% Mounted on /dev/sda7 9,3G 7,8G 1,1G 88% / udev 993M 4,0K 993M 1% /dev tmpfs 401M 884K 400M 1% /run none 5,0M 0 5,0M 0% /run/lock none 1003M 152K 1002M 1% /run/shm /dev/sda8 35G 4,0G 29G 13% /home /dev/sda2 101G 64G 37G 64% /media/A2C8E28BC8E25CD3 Running sudo fdisk -l gives Disk /dev/sda: 160.0 GB, 160041885696 bytes 255 heads, 63 sectors/track, 19457 cylinders, total 312581808 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000080 Device Boot Start End Blocks Id System /dev/sda1 63 96389 48163+ de Dell Utility /dev/sda2 * 98304 210434488 105168092+ 7 HPFS/NTFS/exFAT /dev/sda3 210436094 312576704 51070305+ f W95 Ext'd (LBA) /dev/sda5 306279288 312576704 3148708+ dd Unknown /dev/sda6 210436096 214341631 1952768 82 Linux swap / Solaris /dev/sda7 214343680 233873407 9764864 83 Linux /dev/sda8 233875456 306278399 36201472 83 Linux Partition table entries are not in disk order

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  • Read only file system error on ubuntu after partitioning

    - by Ranjith R
    I am not sure if I am the root cause of this problem but this is what I did: I wanted latest ubuntu and latest linux mint together on my thinkpad laptop. Windows 7 was already there. I already had mint. So I put in the USB with ubuntu image and started installing ubuntu. I chose to install side by side. It was taking a long time to finish defragmenting and partitioning. I decided to give up as I became a little impatient and I pressed the skip button. After the skipping, I realized that the partitioning was complete and went ahead with installing ubuntu. Now the linux mint OS starts reporting the file system as read only at least once every day and I have restart and tell the OS to fix errors in hard disk. After I press F key, the system fixes the issues, restarts and all is well again. Is there some way to fix the issue permanently. I think reinstalling will solve the issues, but I can not do it as I have a lot of data and I will have reinstall and configure a lot of softwares that I use daily. I checked the smart check in disk utility and the hard disk seems to be fine Also I checked both the partitions for errors with disk utility and the report says they are fine. Is there something I can do before I reinstall?

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  • How do I throttle a command in a terminal window?

    - by To Do
    I needed to run convert with a lot of images at the same time. The command took quite a while but this doesn't bother me. The issue is that this command rendered my computer unusable while the command was running (for about 15 minutes). So is it possible to throttle the command by limiting resources (processor and memory) to the command, directly from the command line? This can only work if I add something to the same line before pressing Enter because once I start the process the computer slows so much that it is impossible for example to switch to "System monitor" and reduce priority. Edit: top and iotop results I managed to run top and sudo iotop >iotop.txt while doing one of these convert operations. (The iotop.txt file produced is difficult to read) Results of top: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 14275 username 20 0 4043m 3.0g 1448 D 7.0 80.4 0:16.45 convert Results of iotop: [?1049h[1;24r(B[m[4l[?7h[?1h=[39;49m[?25l[39;49m(B[m[H[2JTotal DISK READ: 1269.04 K/s | Total DISK WRITE:[59G0.00 B/s (B[0;7m TID PRIO USER DISK READ DISK WRITE SWAPIN(B[0;1;7m IO(B[0;7m COMMAND [3;2H(B[m2516 be/4 username 350.08 K/s 0.00 B/s 0.00 % 0.00 % zeitgeist-datahub 7394 be/4 username 568.88 K/s 0.00 B/s 77.41 % 0.00 % --rendere~.530483991[5;1H14275 idle username 350.08 K/s 0.00 B/s 37.49 % 0.00 % convert S~f test.pdf[6;2H2048 be/4 root[6;24H0.00 B/s 0.00 B/s 0.00 % 0.00 % [kworker/3:2] [5G1 be/4 root[7;24H0.00 B/s 0.00 B/s 0.00 % 0.00 % init Furthermore, even after the process ends, the computer does not return to the previous performance. I found a way around this by running sudo swapoff -a followed by sudo swapon -a

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  • Tuning Red Gate: #3 of Lots

    - by Grant Fritchey
    I'm drilling down into the metrics about SQL Server itself available to me in the Analysis tab of SQL Monitor to see what's up with our two problematic servers. In the previous post I'd noticed that rg-sql01 had quite a few CPU spikes. So one of the first things I want to check there is how much CPU is getting used by SQL Server itself. It's possible we're looking at some other process using up all the CPU Nope, It's SQL Server. I compared this to the rg-sql02 server: You can see that there is a more, consistently low set of CPU counters there. I clearly need to look at rg-sql01 and capture more specific data around the queries running on it to identify which ones are causing these CPU spikes. I always like to look at the Batch Requests/sec on a server, not because it's an indication of a problem, but because it gives you some idea of the load. Just how much is this server getting hit? Here are rg-sql01 and rg-sql02: Of the two, clearly rg-sql01 has a lot of activity. Remember though, that's all this is a measure of, activity. It doesn't suggest anything other than what it says, the number of requests coming in. But it's the kind of thing you want to know in order to understand how the system is used. Are you seeing a correlation between the number of requests and the CPU usage, or a reverse correlation, the number of requests drops as the CPU spikes? See, it's useful. Some of the details you can look at are Compilations/sec, Compilations/Batch and Recompilations/sec. These give you some idea of how the cache is getting used within the system. None of these showed anything interesting on either server. One metric that I like (even though I know it can be controversial) is the Page Life Expectancy. On the average server I expect see a series of mountains as the PLE climbs then drops due to a data load or something along those lines. That's not the case here: Those spikes back in January suggest that the servers weren't really being used much. The PLE on the rg-sql01 seems to be somewhat consistent growing to 3 hours or so then dropping, but the rg-sql02 PLE looks like it might be all over the map. Instead of continuing to look at this high level gathering data view, I'm going to drill down on rg-sql02 and see what it's done for the last week: And now we begin to see where we might have an issue. Memory on this system is getting flushed every 1/2 hour or so. I'm going to check another metric, scans: Whoa! I'm going back to the system real quick to look at some disk information again for rg-sql02. Here is the average disk queue length on the server: and the transfers Right, I think I have a guess as to what's up here. We're seeing memory get flushed constantly and we're seeing lots of scans. The disks are queuing, especially that F drive, and there are lots of requests that correspond to the scans and the memory flushes. In short, we've got queries that are scanning the data, a lot, so we either have bad queries or bad indexes. I'm going back to the server overview for rg-sql02 and check the Top 10 expensive queries. I'm modifying it to show me the last 3 days and the totals, so I'm not looking at some maintenance routine that ran 10 minutes ago and is skewing the results: OK. I need to look into these queries that are getting executed this much. They're generating a lot of reads, but which queries are generating the most reads: Ow, all still going against the same database. This is where I'm going to temporarily leave SQL Monitor. What I want to do is connect up to the server, validate that the Warehouse database is using the F:\ drive (which I'll put money down it is) and then start seeing what's up with these queries. Part 1 of the Series Part 2 of the Series

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  • Cannot Mount USB 3.0 Hard Disk ?!!

    - by Tenken
    Hi, I have a USB 3.0 external hard disk which I am unable to mount. The entry appears in the "lsusb" command, but I do not exactly understand how to mount it. This is the output for my lsusb command. "ASMedia Technology Inc." is the USB 3.0 device. I would appreciate some help in mounting and accessing the hard disk. This the relevant output of my "lsusb -v" : Bus 009 Device 002: ID 174c:5106 ASMedia Technology Inc. Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.10 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 64 idVendor 0x174c ASMedia Technology Inc. idProduct 0x5106 bcdDevice 0.01 iManufacturer 2 ASMedia iProduct 3 AS2105 iSerial 1 00000000000000000000 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 32 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 0 bmAttributes 0xc0 Self Powered MaxPower 0mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 8 Mass Storage bInterfaceSubClass 6 SCSI bInterfaceProtocol 80 Bulk (Zip) iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x02 EP 2 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0200 1x 512 bytes bInterval 0 Device Qualifier (for other device speed): bLength 10 bDescriptorType 6 bcdUSB 2.10 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 64 bNumConfigurations 1 Device Status: 0x0001 Self Powered Bus 009 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 3.00 bDeviceClass 9 Hub bDeviceSubClass 0 Unused bDeviceProtocol 3 bMaxPacketSize0 9 idVendor 0x1d6b Linux Foundation idProduct 0x0003 3.0 root hub bcdDevice 2.06 iManufacturer 3 Linux 2.6.35-28-generic xhci_hcd iProduct 2 xHCI Host Controller iSerial 1 0000:04:00.0 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 25 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 0 bmAttributes 0xe0 Self Powered Remote Wakeup MaxPower 0mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 1 bInterfaceClass 9 Hub bInterfaceSubClass 0 Unused bInterfaceProtocol 0 Full speed (or root) hub iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0004 1x 4 bytes bInterval 12 Hub Descriptor: bLength 9 bDescriptorType 41 nNbrPorts 4 wHubCharacteristic 0x0009 Per-port power switching Per-port overcurrent protection TT think time 8 FS bits bPwrOn2PwrGood 10 * 2 milli seconds bHubContrCurrent 0 milli Ampere DeviceRemovable 0x00 PortPwrCtrlMask 0xff Hub Port Status: Port 1: 0000.0100 power Port 2: 0000.0100 power Port 3: 0000.0503 highspeed power enable connect Port 4: 0000.0503 highspeed power enable connect Device Status: 0x0003 Self Powered Remote Wakeup Enabled This is the error given when I try to mount the hard drive: shinso@shinso-IdeaPad:~$ sudo mount /dev/sdb /mnt [sudo] password for shinso: mount: /dev/sdb: unknown device This the output of "dmesg|tail": [30062.774178] Either the lower file is not in a valid eCryptfs format, or the key could not be retrieved. Plaintext passthrough mode is not enabled; returning -EIO [30535.800977] usb 9-4: USB disconnect, address 3 [30659.237342] Valid eCryptfs headers not found in file header region or xattr region [30659.237351] Either the lower file is not in a valid eCryptfs format, or the key could not be retrieved. Plaintext passthrough mode is not enabled; returning -EIO [31259.268310] Valid eCryptfs headers not found in file header region or xattr region [31259.268313] Either the lower file is not in a valid eCryptfs format, or the key could not be retrieved. Plaintext passthrough mode is not enabled; returning -EIO [31860.059058] Valid eCryptfs headers not found in file header region or xattr region [31860.059062] Either the lower file is not in a valid eCryptfs format, or the key could not be retrieved. Plaintext passthrough mode is not enabled; returning -EIO [32465.220590] Valid eCryptfs headers not found in file header region or xattr region [32465.220593] Either the lower file is not in a valid eCryptfs format, or the key could not be retrieved. Plaintext passthrough mode is not enabled; returning -EIO I am using Ubuntu 10.10 (64 bit). Any help is appreciated.

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  • Not enough free disk space

    - by carmatt95
    I'm new to Ubuntu and I'm getting an error in software updater. When I try and do my daily updates, it says: The upgrade needs a total of 25.3 M free space on disk /boot. Please free at least an additional 25.3 M of disk space on /boot. Empty your trash and remove temporary packages of former installations using sudo apt-get clean. I tried typing in sudo apt-get clean into the terminal but I still get the message. All of the pages I read seem to be for experianced Ubuntuers. Any help would be appreciated. I'm running Ubuntu 12.10. I want to upgrade to 13.04 but understand I have to finish these first. EDIT: @Alaa, This is the output from typing in cat /etc/fstab into the terminal: # /etc/fstab: static file system information. # # Use 'blkid' to print the universally unique identifier for a # device; this may be used with UUID= as a more robust way to name devices # that works even if disks are added and removed. See fstab(5). # # <file system> <mount point> <type> <options> <dump> <pass> /dev/mapper/ubuntu-root / ext4 errors=remount-ro 0 1 # /boot was on /dev/sda1 during installation UUID=fa55c082-112d-4b10-bcf3-e7ffec6cebbc /boot ext2 defaults 0 2 /dev/mapper/ubuntu-swap_1 none swap sw 0 0 /dev/fd0 /media/floppy0 auto rw,user,noauto,exec,utf8 0 0 matty@matty-G41M-ES2L:~$ df -h: Filesystem Size Used Avail Use% Mounted on /dev/mapper/ubuntu-root 915G 27G 842G 4% / udev 984M 4.0K 984M 1% /dev tmpfs 397M 1.1M 396M 1% /run none 5.0M 0 5.0M 0% /run/lock none 992M 1.8M 990M 1% /run/shm none 100M 52K 100M 1% /run/user /dev/sda1 228M 222M 0 100% /boot matty@matty-G41M-ES2L:~$ dpkg -l | grep linux-image: ii linux-image-3.5.0-17-generic 3.5.0-17.28 i386 Linux kernel image for version 3.5.0 on 32 bit x86 SMP ii linux-image-3.5.0-18-generic 3.5.0-18.29 i386 Linux kernel image for version 3.5.0 on 32 bit x86 SMP ii linux-image-3.5.0-19-generic 3.5.0-19.30 i386 Linux kernel image for version 3.5.0 on 32 bit x86 SMP ii linux-image-3.5.0-21-generic 3.5.0-21.32 i386 Linux kernel image for version 3.5.0 on 32 bit x86 SMP ii linux-image-3.5.0-22-generic 3.5.0-22.34 i386 Linux kernel image for version 3.5.0 on 32 bit x86 SMP ii linux-image-3.5.0-23-generic 3.5.0-23.35 i386 Linux kernel image for version 3.5.0 on 32 bit x86 SMP ii linux-image-3.5.0-24-generic 3.5.0-24.37 i386 Linux kernel image for version 3.5.0 on 32 bit x86 SMP ii linux-image-3.5.0-25-generic 3.5.0-25.39 i386 Linux kernel image for version 3.5.0 on 32 bit x86 SMP ii linux-image-3.5.0-26-generic 3.5.0-26.42 i386 Linux kernel image for version 3.5.0 on 32 bit x86 SMP iF linux-image-3.5.0-28-generic 3.5.0-28.48 i386 Linux kernel image for version 3.5.0 on 32 bit x86 SMP

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  • Which program do you recommend for monitoring the list of installed programs in Windows? [closed]

    - by Nickolai Leschov
    I am in charge of a computer network in a small company (20..30 computers). Recently the need arose to control what kinds of programs our company is using i.e. to collect information that is available when one opens "Add or Remove Programs" in Windows. I would like to have a program that will collect this kind of information over the network of Windows machines. What is your recommendation?

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  • Framework for Monitoring logs of an application

    - by whyjava
    hello I am working on writing an web application which will be monitoring an java process which moves files from one location to another. The monitoring application needs to do following things Monitor log files View the content of moved files Is there any opensource framework which provides monitoring capabilities over logging. I am building this application in java. Thanks

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