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• How to determine source of file corruption for downloaded images?

  - by sunpech

  I've been downloading Visual Studio 2010 off of the Dreamspark.com website using Akamai Downloader. The .img file is 2.2 GB in size. I've downloaded it twice so far, and when I try to mount it using Gizmo, it complains that "the disk structure is corrupted and unreadable". The drive does mount, but it is unreadable. Is there a way to determine where the source of the data corruption is coming from? Is it my computer as it's receiving it? The hosting server(s)? My ISP? My router? My ethernet cable? It's a hefty download to do again and again from home, only to find out once it's fully downloaded that it's unreadable. I think I can almost rule out my PC, router, and ethernet cable, as I've been able to download various other files without corruption. Note: There is no checksum to verify against

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• After using lvextend, I can't recover unused space

  - by Cory Gagliardi

  I needed to add more disk space to my CentOS VM, so I added another virtual disk, then used lvextend to add the space to the existing partition. The steps I followed was: echo "- - -" > /sys/class/scsi_host/host0/scan pvcreate /dev/sdb vgextend VolGroup00 /dev/sdb lvextend -l +100%FREE /dev/VolGroup00/LogVol00 resize2fs /dev/VolGroup00/LogVol00 This worked fine. I subsequently filled up the VM, then deleted most of the used disk space. However, the unused disk space was never recovered after I deleted all of the files. This will illustrate what I'm saying better: # df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 61G 32G 26G 56% / /dev/sda1 99M 20M 75M 21% /boot tmpfs 1006M 0 1006M 0% /dev/shm # pwd; du -h --max-depth=0 / 5.1G . I cannot figure out how to get the partition to see that only 5.1 GB is used. Any ideas what I'm doing wrong?

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• Windows Server 2008 Standard vs. Web

  - by Andreas

  I'm currently comparing Windows Server 2008 versions to see what to use. What i found is this, that might affect me: RAM: 32GB. (the same) Sockets: 4 (the same) Remote Desktop: 2 (the same) IIS: true (the same) Application Server: Only standard. I will run my server as a single CPU (4 core) 8GB RAM, 2x raid1 web-server running: IIS Asp.net .Net 4 Third part mail server. (Only for sending mail from my web-application) SQL Server Express (My data is not more then 10 GB) Some minor applications for import and export of data. I might use external load balancer if I install a second machine in the future. My question is if you see any reason for me to go for standard that is 4 x price compared to web. BR Andreas

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• Slow NFS transfer performance of small files

  - by Arie K

  I'm using Openfiler 2.3 on an HP ML370 G5, Smart Array P400, SAS disks combined using RAID 1+0. I set up an NFS share from ext3 partition using Openfiler's web based configuration, and I succeeded to mount the share from another host. Both host are connected using dedicated gigabit link. Simple benchmark using dd: $ dd if=/dev/zero of=outfile bs=1000 count=2000000 2000000+0 records in 2000000+0 records out 2000000000 bytes (2.0 GB) copied, 34.4737 s, 58.0 MB/s I see it can achieve moderate transfer speed (58.0 MB/s). But if I copy a directory containing many small files (.php and .jpg, around 1-4 kB per file) of total size ~300 MB, the cp process ends in about 10 minutes. Is NFS not suitable for small file transfer like above case? Or is there some parameters that must be adjusted?

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• Fast user switching is logging users off instead of switching users

  - by Nathan Osman

  I have a netbook running Windows 8.1 Pro that will no longer allow more than one user to be logged in at the same time. The steps necessary to reproduce this are as follows: The current user presses WIN to bring up the start screen. The user clicks his name in the corner and a list of other users appears. As soon as one of the other names is clicked, the user is unceremoniously logged off without any prompts. This behavior seems to have started some time after upgrading to Windows 8.1 from Windows 8. Before that point, everything worked fine and more than one user could be logged in at the same time. I've tried searching for others experiencing similar problems but this appears to be unique. System Details: CPU: Intel Atom N455 @ 1.66 GHz RAM: 1 GB OS: Windows 8.1 Pro w/ Media Center 32-bit

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• Content server backups

  - by Dan Sosedoff

  What is the best way to backup data on content servers? For example, I have 15 servers that just have content, no applications running on it. Each server has a 250 GB hard drive. So, it's a pretty big amount of data. All the data have external access (via HTTP). So, the question is: what methodology is best in my case? The most useful method I know is cross-backup: when each server contains its own data and backup of one other server. But, there is significant reduction in total capacity. RAID?

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• Queries related to Windows 8 Upgrade installation media

  - by Karan

  I don't expect all these questions to be answered right away. Gradually over time is fine. Also, I guess the answers would differ depending on the language, so I'm looking for information related to the English/en-US versions only (I believe there is an en-GB version as well?) The Windows 8 Upgrade Assistant allows one to create USB/DVD (ISO) media: Is the media customised per-PC in any way, or are copies created on different PCs with different base OSes (XP/Vista/7) exactly the same? If the ISOs are not customised, are they exactly the same content-wise as the Upgrade DVDs available for purchase?

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• PostgreSQL server: 10k RPM SAS or Intel 520 Series SSD drives?

  - by Vlad

  We will be expanding the storage for a PostgreSQL server and one of the things we are considering is using SSDs (Intel 520 Series) instead of rotating discs (10k RPM). Price per GB is comparable and we expect improved performance, however we are concerned about longevity since our database usage pattern is quite write-heavy. We are also concerned about data corruption in case of power failure (due to SSDs write cache not flushing properly). We currently use RAID10 with 4 active HDDs (10k 146GB) and 1 spare configured in the controller. It's a HP DL380 G6 server with P410 Smart Array Controller and BBWC. What makes more sense: upgrading the drives to 300GB 10k RPM or using Intel 520 Series SSDs (240GB)?

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• Exchange Transport Service Started but not working

  - by Philippe

  Good day, Here is the problem : We are hosting a Microsoft Exchange Server. Everything working fine until recently, where the mail transport seems to go wrong. We almost have to restart the service every morning. The thing is that the transport service is started, but the mail are not delivered to the users and senders to our server get a delayed delivery notification. When we restart the service, all the mail is then delivered to the users and we're good to go for a day or two. Things I've noticed : The store service is growing to around 6 Gb of used RAM, and the w3wp.exe service is hanging around 700mb RAM. Is there a way to schedule a restart of the transport role every 4 hours or something while I'm solving the issue so I don't have to worry when I leave for the week-end? And most of all...does anyone have any idea on how to solve this issue? Thanks, Philippe

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• Server 2008 Hard Faults

  - by claw

  Hey all, plase bear with me as I haven't looked at a server in a very long time. The problem I am having is with a Windows 2008 Standard FE Service Pack 2 Intel Xeon X3430 @ 2.40 2.39 GHZ 4 GB Memory 64 Bit There seems to be no problems other than the physical memory peaking at 91%, always with over 100 Hard Faults Per Second. To my understanding hard faults should be fairly rare on a machine with. Are there any logs I can show you? Or investigate myself. The general performance of the machine is ok, i can access SBS2008 and change settings fairly smoothly without hangs etc. However, we connect to the server and do quite a bit of SQL via an application. For a record to retrieve say 20 rows, it can take 20+ seconds. Thanks in advance, Jamie EDIT: What the server is used for: IIS ASP Web Service SQL 2008 List item Exchange unable to upload screenshots due to low reputation - why doesnt my SO work here :)

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• Add unallocated space to lvm

  - by Newbie

  I shrunk my windows partition and now have 10 GB of unallocated space that I now want to use to grow my / partition which is an ext4 in an lvm. I'm running Fedora 12. I ran system-config-lvm but the "Initialize Entry" button is greyed out. The unallocated space is not adjacent to the lvm but I cannot move the partitions in GParted like I was able to with ext3 in the past. I cannot create a new partition either as it says it cannot have more than 4 primary partitions. I don't see any option to create an extended partition. So my question is, how do I add that unallocated space to the lvm so I can grow the size of the / partition? I don't want to reinstall Fedora.

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• Create new partition on live production CentOS server

  - by Kimmel

  I have a production server that is running on CentOS. I'd like to create a partition on the server without having to reinstall everything. I have CLI and VNC access to the remote server. Is there anyway that I can create a partition safely? Here's my output from fdisk -l Disk /dev/sda: 85.9 GB, 85899345920 bytes 255 heads, 63 sectors/track, 10443 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: 0x00033d5e Device Boot Start End Blocks Id System /dev/sda1 * 1 10444 83885056 83 Linux Thanks.

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• JVM memory initializazion error after windows update

  - by gianni

  We have three Windows Server 2003 with 2 GB RAM. Server1 tomcat 5.5.25 jvm version SUN 1.6.0_11-b03 Server2 tomcat 5.5.25 jvm version SUN 1.6.0_14-b08 Server3 tomcat 6.0.18 jvm version SUN 1.6.0_14-b08 For the three servers JVM parameters are: -XX:MaxPermSize=256m -Dcatalina.base=C:\Programmi\Apache Group\apache-tomcat-5.5.25 -Dcatalina.home=C:\Programmi\Apache Group\apache-tomcat-5.5.25 -Djava.endorsed.dirs=C:\Programmi\Apache Group\apache-tomcat-5.5.25\common\endorsed -Djava.io.tmpdir=C:\Programmi\Apache Group\apache-tomcat-5.5.25\temp vfprintf -Xms512m -Xmx1024m For some months everithing worked fine. Last friday we installed some windows updates. After the reboot tomcat doesnt start with error: Error occurred during initialization of VM Could not reserve enough space for object heap We reduced the parameter -Xmx1024m to -Xmx768m and now tomcat starts. But we need greater max heap size What happened to our servers ? Thanks in advance.

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• How to increase hard drive transfer speed

  - by atif089

  This is my motherboard GA-M61PME-S2 (SATA upto 3.0 Gbps) and This is my Hard Disk Samsung hd502hi Capacity 500 GB Cache 16MB Disks / Heads 1 / 2 Interface SATA 3Gb/s Spindle Speed 5400 RPM Sustained Data Rate OD 100 MB/s Average Seek 8.9 ms Average Latency 5.56 ms Data Transfer Rate 300 MB/sec Weight 470 grams Power: Idle / Seek / R-W / Spin-up 3.9W / 4.8W / 5.1W / ~24W Acoustics (sound power) 2.2 / 2.7 Bel (idle / quiet seek / performance seek) When I copy things from one partition to another they transfer at a maximum of 30 MBps. However the drive supports upto 300 MBps right ? How do I increase the transfer speeds? P.S - Using Windows XP, All partitions are NTFS.

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• Postfix performance

  - by Brian G

  Running postfix on ubuntu, sending alot of mail ( ~ 1 million messages ) per day. loads are extremly high but not much in terms of cpu and memory load. Anyone in a similiar situation and know how to remove the bottleneck? All mail on this server is outbound. I would have to assume the bottleneck is disk. Just an update, here is what iostat looks like: avg-cpu: %user %nice %system %iowait %steal %idle 0.00 0.00 0.12 99.88 0.00 0.00 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 0.00 12.38 0.00 2.48 0.00 118.81 48.00 0.00 0.00 0.00 0.00 sdb 1.49 22.28 72.28 42.57 629.70 1041.58 14.55 135.56 834.31 8.71 100.00 Are these numbers in line with the performance you would expect from a single disk? sdb is dedicated to postfix. I think it is queue shuffling, from incoming-active-deferred More details from questions: Server: Quad core Xeon(R) CPU E5405 @ 2.00GH with 4 GB ram Load average: 464.88, 489.11, 483.91, 4 cores. but the memory utilization and cpu is minimal Postfix instances between 16 - 32

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• How to (hardware) RAID 10 on Ubuntu 10.04 LTS with 4 drives and motherboard with RAID contoller

  - by lollercoaster

  I have 4 500GB hard drives. I set up a RAID 10 in BIOS, much like shown here: http://www.supermicro.com/manuals/other/RAID_SATA_ESB2.pdf Then I followed these instructions: http://www.unrest.ca/Knowledge-Base/configuring-mdadm-raid10-for-ubuntu-910 Basically I cannot get it to work. I go through the instructions when I get to the "partition" section of the install, creating 4 RAID 1's (2 partitions on each drive, one for primary and one for swap space), then combining to make a RAID 10. Unfortunately it still shows 2 partitions, one 500 GB and another being 36GB for some reason. Any ideas? I think best would be if anyone had found good instructions (step by step) for how to do this...I've been googling for hours and haven't found anything...

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• IDE <-> SATA Adapter Issue - Hard Drive Not recognized

  - by nicorellius

  I was trying to use one of these IDE to SATA adapters (Syba SD-ADA50016 IDE/SATA Converter Bi-directional IDE to SATA) and I connected a working hard drive (Seagate Barracuda 500 GB SATA 3.5 Inch 7200 RPM Version 12 Desktop Internal Hard Drive ST3500418AS). I could get the drive to be recognized by the BIOS, but I couldn't boot a Linux disc or install to the drive. I tried to install pfSense to this drive and the install failed because the setup couldn't recognize the file. Has anyone heard of these adapters giving trouble and/or not working properly? I would like to be able to use this device for newer drives on older boards.

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• Linux software to maintain old/backup versions of directory tree

  - by Bittrance

  I am replacing an old Linux file server serving NFS and CIFS. For the new server (still serving CIFS and NFS), I would like to have software that automatically and efficiently maintains old revisions of files in parallel trees, so that they can be accessed by users without special tools. I am looking for software that is akin to Time Machine or Flyback, but works well on a server. The dataset is some 10000 files weighing maybe 60 GB. Changes are relatively few, usually less than 100 files changes daily. Using LVM snapshots will not cut it, as the old revisions must reside on a separate set of disks from the live data. Edit: To clarify: keeping old revisions is non-vital addition to the solution, so any suggestion will have to stay in the range of some hundred euros.

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• Why do Finder and du report different file size?

  - by flipdoubt

  I am writing a geektool 3 script to show the size of a particular VMware Fusion virtual machine. Get Info in Finder says the file is "52.91 GB". I run the following du command to get the file size: > du -hs ~/Documents/Virtual\ Machines.localized/MY-PRECIOUS-7.vmwarevm | awk '{print $1}' This du -hs command returns the file size as "49G". What accounts for the difference from what Finder reports? Alternatively, I have tried replacing the -s option with the -d option like so: du -hd ~/Documents/Virtual\ Machines.localized/MY-PRECIOUS-7.vmwarevm | awk '{print $1}' This du -hd command returns the file size as "59G". What accounts for the difference between Finder, du -hd, and du -hs? Also, this du -hd command produces no output in geektool 3. What gives?

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• Add unallocated space to lvm

  - by Newbie

  I shrunk my windows partition and now have 10 GB of unallocated space that I now want to use to grow my / partition which is an ext4 in an lvm. I'm running Fedora 12. I ran system-config-lvm but the "Initialize Entry" button is greyed out. The unallocated space is not adjacent to the lvm but I cannot move the partitions in GParted like I was able to with ext3 in the past. I cannot create a new partition either as it says it cannot have more than 4 primary partitions. I don't see any option to create an extended partition. So my question is, how do I add that unallocated space to the lvm so I can grow the size of the / partition? I don't want to reinstall Fedora.

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• Laptop HDD failure imminent?

  - by Andrei Rinea

  I have an HP Compaq 615 laptop with an 160 GB 7200 rpm HDD. Hasn't been dropped or shaken, in fact it almost always stayed on my desk. I've treated it as nice as I could. The other day, however, my OS froze and I could hear a repeated clink-clink-clink coming from the HDD zone of the laptop. I had to switch off hardware-ly the laptop and re-start it. It worked very well after, including now. However I backed up immediately the core data on my USB drive and ordered an external USB HDD for periodic backups. Will it die soon or it was just a "blip"?

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• How do I recover from a Linux CentOS 4.6 Operating System Crash

  - by Greg Omebije

  Our x86 Linux server running CentOS4.6 has crashed. The machine boots only to the Grub prompt. We have tried using the "rescue mode" to recover the System, but it hasn't worked. How can we fix this problem, so that the machine boots normally? How can we fix this problem to the point were we can recover our files from the server Our Linux Server Configuration: Dell PowerEdge 1950 Intel Xeon 2 HDD (146GB each) 4GB RAM Hardware and Software raid setup CentOS 4.6 We used Sysrecord to boot the computer: the following are the output of fdisk -l Disk /dev/sda: 293.3 GB, 292326211584 255 heads, 63 sectors/track, 35539 Cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x00000080 Device Boot Start End Blocks Id System /dev/sda1 * 1 13 104391 83 Linux /dev/sda2 14 17769 142625070 8e Linux LVM

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• local cache for NAS or network folder

  - by HugoRune

  I am planning to build a network attached storage (NAS) server. Is there a way to cache frequently acccessed files from the remote storage automatically on the local PC? (I am not looking for a way to sync whole folders like rsync, but rather something that automatically and transparently caches the last accessed 50 gb of files.) Ideally I am searching for something that caches writes as well as reads, since only one pc will be accessing the server (and one day of lost changes if the local cache is damaged would be acceptable) I looked into windows offline files, but as far as I could tell this requires manual interaction to disconnect the server or go into offline mode in order to use the cache. The server would probably be running Linux or freeNAS, the pc runs Windows xp, but could be upgraded to 7 if required.

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• Can I provision half a core as a virtual CPU?

  - by ramdaz

  I am virtualization newbie. Please advise on these questions. Please note using a commercial VM software like Citrix or VMware is not a choice for me. I have at my disposal a couple of 2x 4 core servers with 32 GB RAM. I need to create 16 VMs on each server to test some web applications. Can I provision half a core as a virtual CPU for each VM? To my best knowledge I can't do so on Xen. Is it possible on KVM or some other free open source VM solution? If it's not possible to assign half a core, how do I ensure that uniform processing power is available for all VMs? Since the job is to create separate instances for hosting 16 web apps in a physical server, do you recommend setting up a private cloud using Ubuntu Enterprise Cloud as a better option? Is there HA solution under KVM, like Remus for Xen?

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• Several "SideBySide" errors in the event viewer (Windows XP SP3)

  - by Wesley

  Hi all, For some reason, my netbook continuously comes up with SideBySide errors in the event viewer under Computer Management. Is there some way to get rid of these errors? My netbook occasionally BSODs and looking back into the event viewer after, at least 8 SideBySide errors were logged prior to BSOD. Please help! Thanks in advance. Netbook is a Samsung N120 with upgraded RAM to 2 GB. EDIT: So, SideBySide errors have been resolved and apparently the BSOD isn't related. But I remember specifically, that last time I had a BSOD, it was due to an "unknown hard error." What causes that?

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