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• Missing over 100GB of Space on sda1 RHEL

  - by WifiGhost

  I have a server setup with a RAID 5 using (3) 500GB drives, 1 as a spare so unused in the RAID. So in my mind i start out with 990GB with the RAID 5 in place. When looking at DF or the built in disk space utility i only see a total of about 882GB, how can i find where the 100+GB went? How can i get it back? I've checked the RAID 5 BIOS and i see all the space. I've tried looking manually and through terminal commands with no luck. Filesystem - 1K-blocks - Used Available - Use% - Mounted on /dev/mapper/vg_web-lv_root 838084192 48368700 747153060 7% / tmpfs 12104644 592 12104052 1% /dev/shm /dev/sda1 495844 121546 348698 26% /boot /dev/mapper/vg_web-lv_home 82569904 259136 78116468 1% /home Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_web-lv_root 800G 47G 713G 7% / tmpfs 12G 592K 12G 1% /dev/shm /dev/sda1 485M 119M 341M 26% /boot /dev/mapper/vg_web-lv_home 79G 254M 75G 1% /home

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• VMware networking - PortChannel or not?

  - by dunxd

  My ESX hosts each have 8 NICS. I have set up 2 NICs for our iSCSI SAN - each is connected to a different SAN switch. 2 NICs are set up for vMotion and Service Console - these are each connected to a different core switch (ports are trunked with VLANs dedicated to vMotion and Management) I now have four ports left over. Currently we have these set up each going into our default VLAN. Two NICs are connected to one core-switch and two are connected to the other. We decided to aggregate the connections to each switch - so they are teamed at the vswitch end, and port channelled at the physical switch end. I am now reading that port channelling these connections is not particularly useful, perhaps even over complicating things. Is there a particular problem with using port channels for VMware? What method provides the best balance between redundancy and performance?

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• Windows 7 (32bit) not adding favorites to Windows Explorer

  - by bsigrist

  I am attempting to add several locations on my disk to my "Favorites" in Windows Explorer. I have used this feature in the 64bit version of Windows 7 without a problem, but it does not seem to work in this install. Here is my methodology so far. 1.) Go to a location in Windows Explorer "C:\users\Benjamin" 2.) Right click on the "favorites" in the left hand folder navigation window and select "Add current location to Favorites" It does not fire an error, but the location does not appear under favorites. What might be happening here to prevent "favorites" from populating?

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• Mono on Linux: Apache or Nginx

  - by Furism

  Hi, I'm developing an ASP.NET application that will be run under Linux/Mono for various reasons (mostly to stay away from IIS, quite frankly). Of course the first web server I had in mind was Apache. But Apache, for all its advantages, adds a lot of overhead. Also, the application I'm building needs to be highly scalable and performance is one of the main concern. Apache has, obviously, a very good reputation and its record speaks for itself, but I don't need things like Reverse Proxy or Load Balancing because dedicated network devices would be used for that. So those modules from Apache will never be used. So basically my question is: since Nginx seems to fit exactly needs, is there any caveat I should be aware of? For instance, is Nginx renowned to be particularity safe? When security flaws are detected, how fast are they patched? Any insight on the pros and cons of using either of those servers in conjunction with Mono is welcome.

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• MaxClients in apache. How to know the size of my proccess?

  - by Larry

  From http://httpd.apache.org/docs/2.2/misc/perf-tuning.html The single biggest hardware issue affecting webserver performance is RAM. A webserver should never ever have to swap, as swapping increases the latency of each request beyond a point that users consider "fast enough". This causes users to hit stop and reload, further increasing the load. You can, and should, control the MaxClients setting so that your server does not spawn so many children it starts swapping. This procedure for doing this is simple: determine the size of your average Apache process, by looking at your process list via a tool such as top, and divide this into your total available memory, leaving some room for other processes. The main issue is that I can't understand how to know the size, because, well i have the size of httpd on no more of 3888 But, if we need to determine the number for MaxClients, and I have 4GB of RAM, so I get: 972, so I should use like 900 in the MaxClients?

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• Apache Prefork Configuration

  - by user1618606

  I'm newbie on VPS configuration. So, I've installed apache, php and mysql and now I need to know how to configure Prefork to optimize Apache. The system configuration is: CPU Cores 2 x 2 Ghz @ 4 Ghz RAM Memory 2304 MB DDR3 Burst Memory 3 GB DDR3 Disk Space 30 GB SSD Bandwidth 3 TB SwitchPort 1 Gbps Actually, after linux, mysql, apache and php, there are 250 MB memory in use. Well, I don't have idea to calculate. I saw in some websistes, some vars like: KeepAlive On KeepAliveTimeout 1 MaxKeepAliveRequests 100 StartServers 15 MinSpareServers 15 MaxSpareServers 15 MaxClients 20 MaxRequestsPerChild 0 or StartServers 2 MaxClients 150 MinSpareThreads 25 MaxSpareThreads 75 ThreadsPerChild 25 MaxRequestsPerChild 0 How I could to do: Prefork or worker? Where and how the vars are placed? In httpd.conf?

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• Apache Prefork Configuration

  - by user1618606

  I'm newbie on VPS configuration. So, I've installed apache, php and mysql and now I need to know how to configure Prefork to optimize Apache. The system configuration is: CPU Cores 2 x 2 Ghz @ 4 Ghz RAM Memory 2304 MB DDR3 Burst Memory 3 GB DDR3 Disk Space 30 GB SSD Bandwidth 3 TB SwitchPort 1 Gbps Actually, after linux, mysql, apache and php, there are 250 MB memory in use. Well, I don't have idea to calculate. I saw in some websistes, some vars like: KeepAlive On KeepAliveTimeout 1 MaxKeepAliveRequests 100 StartServers 15 MinSpareServers 15 MaxSpareServers 15 MaxClients 20 MaxRequestsPerChild 0 or StartServers 2 MaxClients 150 MinSpareThreads 25 MaxSpareThreads 75 ThreadsPerChild 25 MaxRequestsPerChild 0 How I could to do: Prefork or worker? Where and how the vars are placed? In httpd.conf?

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• grep pattern interpretted differently in 2 different systems with same grep version

  - by Lance Woodson

  We manufacture a linux appliance for data centers, and all are running fedora installed from the same kickstart process. There are different hardware versions, some with IDE hard drives and some SCSI, so the filesystems may be at /dev/sdaN or /dev/hdaN. We have a web interface into these appliances that show disk usage, which is generated using "df | grep /dev/*da". This generally works for both hardware versions, giving an output like follows: /dev/sda2 5952284 3507816 2137228 63% / /dev/sda5 67670876 9128796 55049152 15% /data /dev/sda1 101086 11976 83891 13% /boot However, for one machine, we get the following result from that command: Binary file /dev/sda matches It seems that its grepping files matching /dev/*da for an unknown pattern for some reason, only on this box that is seemingly identical in grep version, packages, kernel, and hardware. I switched the grep pattern to be "/dev/.da" and everything works as expected on this troublesome box, but I hate not knowing why this is happening. Anyone have any ideas? Or perhaps some other tests to try?

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• KVM CLI install for CentOS 6.3 defaults to Minimal Install

  - by i.h4d35

  So I now I've installed KVM (and its associated tools and packages- libvirt, VMM etc.). On the GUI (i.e using the VMM), installation works as its supposed to. However, when I try to create a VM using the command line interface, the OS (I am working with CentOS 6.3) defaults to a Minimal Install instead of giving me options to choose from at the time of installation. I am trying to install using the following command: virt-install \ --connect qemu:///system \ --virt-type kvm --name testVM2 \ --ram 512 --disk path=/var/lib/libvirt/images/testVM2.img,size=8 --vnc \ --cdrom /media/db18de8e-0853-49fb-80de-5c794d58a46f/CentOS-6.3- x86_64-bin-DVD1.iso \ --network network=default Specifying the OS-type or the OS-variant parameters doesn't make a difference. Is there something that I am missing out on or some other parameter that I must specify? Thanks in advance.

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• How do you remove old Windows Vista Backups?

  - by leeand00

  I've been backing up my Vista box using Complete PC backup for quite a while now, and I was just wondering how it is that you remove old backups when your backup drive is to full for another backup. I recently received the following error: The backup did not complete successfully. An error occurred. The following information might help you resolve the error: There is not enough space to save the backup files. Free up disk space or change your backup settings. (0x81000005) I don't see anything in the settings for the backup to change this. Do I have to mount the backup to delete an old backup? If so where is that file located? Update Posted my question here

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• Which software could I use to setup a 4in6 IP tunnel (RFC 2473) on GNU/Linux

  - by Mildred

  Here is my problem. I have a server A that has two IP addresses. One public IPv4 and one IPv6. Server B has only one IPv6 address. I want to host most of my services on server B (because I have more disk space on it, I can control it better) but I need the IPv4 of the server A. I would like to set up a 4in6 tunnel (RFC 2473) between A and B so that I can transfer the traffic from the IPv4 address in A to B. If needed, I can request another IPv4 address on the server A, but I'd prefer not to. My question is: which software use to do the 4in6 tunnelling? I suppose OpenVPN can do the thing, but is there any implementation of the 4in6 protocol on Linux? A little more challenging: the IPv4 address comes from a venet interface, which cannot be bridged. How could I transfer ownership of this address I don't use on server A to the server B? Thank you

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• Are there any FIPS-140-2 certified solutions for Linux?

  - by Mark Renouf

  I'm not even 100% certain what this involves, but my current understanding is this: use of only approved cryptographic algorithms for network traffic (easy, we use SSL and lock down the algorithms to only the really strong ones). Some form of physical data protection, involving disk encryption and physical tamper evident packaging. Obviously we're on our own if we need a tamper-proof product. But what about software for encrpytion. My guess is just using LUKS (although secure) will not be certified because it's open source (gov't seems a bit biased towards proprietary solutions here). Guardian Edge was mentioned by someone, but that appears to be complete Windows-based. So we need something like it, certified FIPS-140 compliant we can use on Linux.

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• SQL Server: "This filegroup cannot be used as a backup destination" error when attempting restore

  - by Ariel

  When running a command like the following: "RESTORE FILELISTONLY FROM DISK='\\\\server\\folder\\DummyDB.bak'" I'm getting this error: Backup destination "\\server" supports a FILESTREAM filegroup. This filegroup cannot be used as a backup destination. Rerun the BACKUP statement with a valid backup destination. RESTORE FILELIST is terminating abnormally. Unless someone comes up with a better idea, it seems that the drive from which restore is being attempted must not contain any database file contained in a filegroup. Is that the case? Thanks in advance.

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• How to set up RAID 1 on Dell PERC S300 With Existing OS Install

  - by Daniel Dugger

  We have a server that is being used in production, but it was not originally meant to. The main thing I want to add to it is a Dell PERC S300 RAID Card to have the main hard drive (Windows Server 2008 R2) mirrored on another hard drive. I can not initialize the disk and wipe the the OS to create the array and then re-install. Is there a way to create the array with a current hard drive, without affecting it, and just mirroring the drive? If that card is not an option, is there a card that would allow that? The server is a Dell PowerEdge T110 II.

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• Restore data from overwritten LVM

  - by Matthias Bayer

  I lost all of my data (8 TB) which I collected over the past few years yesterday because I made some seriuos mistakes during the remounting of my LVM. I run a XenServer5.6 installation with additional 4 harddisks for data storage. An LVM over those 4 HDDs was used to store all of my data. Yesterday, I reinstalled XenServer and wanted to mount my old Harddrives and add the LVM. I run xe sr-create [...] for all disks (/dev/sdb .. /dev/sde), but that was totally wrong. This command deletes the old LVM on the disks and created an new, empty lvm on every single disk with no partitions. No i got 4 empty harddrives :( Is it possible to recover some data from that lost LVM volumes? I have no clue how to do it because i deleted all informations about the old LVM. Is there a way to access the files insed that old lvm directly?

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• Samsung 830 very slow benchmark numbers

  - by alekop

  I just bought a new SSD, and installed a fresh copy of Windows on it. I didn't see any noticeable difference in boot times, app start-up times, so I decided to benchmark it. Asus P7P55D-E Intel i5-760 Samsung 830 256GB SATA III Windows 7 Ultimate 64-bit The Windows experience index gave the drive a 7.3 rating, but real-world performance is not particularly impressive. Any ideas why the numbers are so low? UPDATE: It turns out that SATA III support is turned off by default on the P7P55D motherboard. After enabling it in BIOS (Tools - Level Up), the scores went up: Read Write Seq 325 183 4K 16 49 IOPS 32K 28K It's an improvement, but still far below what they should be for this drive.

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• Intermittent freeze of Windows 7 x64 on laptop

  - by georged

  I have Lenovo W500, 8GB RAM, 250GB Crucial SSD running Windows 7 x64 using boot-to-vhd. Lately I started to experience some random freezes for 5-30 seconds. And when I say "freeze" I mean it; it's like a time machine - no input taken, nothing is written anywhere, no log, no disk activity. And then suddenly machine would wake up and continue as if nothing happened. I do suspect that it's one of the drivers but I don't see any updates in the log lately except for .NET 4 framework and Adobe Reader. Out of new or updated software I can only recall Skype and IE9 but freezes started to occur definitely before IE install. Regular software includes but not limited to: Office 2010, VMWare Workstation, IE9, Chrome, Skype, Seesmic/TweeterDeck, Live Writer. How should I approach the "hunting season" to find our the culprit? Any tools or packages that could help me to identify the component, program, driver that causes the freeze? Cheers

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• SBS 2011 backup

  - by Chris

  I have a freshly installed SBS 2011 server that I need to configure for backup. I tried using the SBS backup configuration tool, but it didn't want to use anything but an external drive. Previously, with our W2K3 servers, I used NTBackup to back up the server to disk and then copied the backup files to a remote server on a regular basis. It doesn't appear this is possible with the built-in backup tools in SBS 2011. Am I missing something? What other options are there that won't cost an arm and a leg?

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• How to change controller numbering/enumeration in Solaris 10?

  - by Jim

  After moving a Solaris 10 server to a new machine, the rpool disk is now c1t0d0. We have some third party applications hard coded for c0t0d0. How can I change the controller enumeration on this machine? There is no longer a c0. I've tried rebuilding the /etc/path_to_inst, but the instance numbers don't seem to match up with the controller numbers. Also, it's not clear if i86pc platforms use this file. I've tried devfsadm -C to clear the dangling links, but I'm not sure how to cause devfsadm to start numbering from 0 again (or force certain devices in the tree to a specific controller number). Next I am going to try to create the symlinks manually in /dev/dsk and rdsk to point to the correct /devices. I feel like I am going way off path here. Any suggestions? Thanks

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• How can I restore my deleted calendar data in Windows Live Mail ?

  - by Cheryl

  I have been using the calendar in Windows Live Mail for months now. When I logged on yesterday, all of the data and appointments I have been inputting for months is gone. The calendar is completely blank. I have performed a system restore with no luck. I have run in safe mode with no luck. I have run a check disk in DOS with no luck. Any other ideas on what I can do to find my calendar info? Could the file be corrupt? I rely on this calendar and all of my info is gone, so any help will be greatly appreciated.

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• How does copy protection work?

  - by Yar

  Many programs refuse to go beyond a trial period. Even if they are trashed and then reinstalled, they 'remember' that the trial period has expired. Assuming no contact with a licensing server, what is the general way that most copy protection works? Do programs drop files in random folders on the hard disk that are hard to track down? I know there's no registry on OSX/Linux, but perhaps something similar... ? Or must it be a file/folder? I'm actually not curious from a hacking side but rather from the implementation side, but in any case the question is basically the same.

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• fdisk -l shows a partition is not in /dev directory

  - by zitronic

  I am having troubles on mounting my ntfs hard drive on linux. I am running ophcrack live CD. fdisk shows me the hard drive I have installed on my computer fdisk -l Disk /dev/hdc: 30.0 GB, 30005821440 bytes 255 heads, 63 sectors/track, 3648 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/hdc1 * 1 3647 29294496 7 HPFS/NTFS but I dont have that device on my /dev directory so I can not mount it ls /dev/hd* /dev/hda /dev/hda4 /dev/hda8 /dev/hdb2 /dev/hdb6 /dev/hdc /dev/hda1 /dev/hda5 /dev/hda9 /dev/hdb3 /dev/hdb7 /dev/hdd /dev/hda2 /dev/hda6 /dev/hdb /dev/hdb4 /dev/hdb8 /dev/hda3 /dev/hda7 /dev/hdb1 /dev/hdb5 /dev/hdb9 What could be going on_

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• Engineers are using explosives to remove hard rock outside our office building. What countermeasures should we take?

  - by Karrax

  Our building is located approx. 100 meters from the explosive charges. They happen several times per day, and really shake the entire building a lot. This is going to go on for many days and the blasts are supposed to get stronger. Our server rooms are nothing fancy; one of them has all the racks on hard concrete while the other one has a raised floor (the one which allows the cables to go beneath it). Does anyone have any tips, countermeasures or best practices for us? Currently we are thinking of the following countermeasures: Daily report of the server rooms status lights (HD lights, power supplies and so on). Nightly check disk scan on the most important servers Order in extra supply of spare harddrives Edit: Many good answers here! However one needs to be accepted. The highest voted answer at the time of this edit will get their answer accepted.

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• Instant database snapshot

  - by raj

  My product uses oracle 9 database in its backend. every week the new release of the product is launched which will want to fire some DML, DDL queries to the database. I usually test the product release in a dummy database before applying it in the main database. I create a database dump using exp command, then import them into dummy database using imp. then i test the product in the dummy database and checks if there are any errors. This exp and imp takes about 3 hours to complete. Is there any alternative as : instant snapshot of the live database (which will be independent of the live one)? or is there any option to keep dummydatabase in sync with the originl database always. Yhis can be done by making the product firing DML&DDL queries to both the databases.. but this will be a HUGE performance problem.. how can i overcome this?

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• OS X Snow Leopard fails to boot after upgrade to 10.6.1

  - by pixeline

  I'm a fairly recent mac user. Been using windows for decades and happily switched. But i upgraded from 10.6 to 10.6.1 last night and the upgrade looks like it failed. I restarted the machine when it asked to then went to bed. In the morning the computer was still trying to shut itself off. So i forced the shutdown, restarted, but now i'm stuck with the loading spinner. What can i do? UPDATE: Verbose didn't show anything interesting. i also did the hardware test. Nothing comes up wrong. Disk utility did not find any error on the HD. But, it did show a fatal error when checking permissions.

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