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• Can't pop3 from exchange server after a reboot

  - by BLAKE

  Last night I shutdown my Exchange 2003 Virtual Machine, I added a new VHD (For backups), and booted it again. Now I can't POP3 email from it with Outlook 2007. In Outlook I get the error: Task '[email protected] - Receiving' reported error (0x800CCC0F) : 'The connection to the server was interrupted. If this problem continues, contact your server administrator or Internet service provider (ISP).' Does anybody know what is wrong? All I did was a reboot. I haven't formated the added disk. There are no weird errors in the event log. I can still send mail with Outlook over port 25. I can send and recieve mail with OWA. I can POP3 the mail to my phone (it take about 15 minutes after sending a message, but I do get it eventually). EDIT: The 'Microsoft Exchange POP3' Service says that it is started but if I stop it and try to start it again, it fails saying 'Could not start the Microsoft Exchange POP3 service on Local Computer. Error 1053: The service did not respond to the start or control request in a timely fashion.' I did some googling and someone on exchangefreaks.com said that if I use task manager to 'End Task' on inetinfo.exe, then I can start the POP3 service fine. Does anyone know what causes this problem? I am fine for now since I did get the Service started, but If it does this after every reboot...

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• Intel Rapid Storage Technology (pre-OS) driver installation

  - by Nero theZero

  My desktop machine is built on Gigabyte GA-Z87-UD3H and Gigabyte provides the latest driver for Intel Rapid Storage Technology (IRST), which I installed after installing the OS. Same goes for my Lenovo Thinkpad-T420. And for both machine, checking the controller device under the IDE ATA/ATAPI Controllers section in Device Manager I see the driver has been updated to the latest version. I set the SATA controller to AHCI from BIOS On the desktop machine I have one WD 2TB BLACK & one WD 3TB Green I don’t use RAID, & no chance of using in near future, but according to Intel IRST improves performance in single disk scenario too. Now I have the following questions – What is the actual purpose of IRST (pre-OS install) driver that doesn’t get served with a post-OS driver that I installed? There must be some difference, otherwise there wouldn’t be a pre-OS version of the driver. Right? In the pre-OS procedure (loading the drivers at OS-installation time) after successfully completing the OS installation, do I need that post-OS driver? Because after installing from that one I got a quick launch icon that runs the IRST configuration application. Where do get that after installing the pre-OS driver? As it is “pre-OS”, when I load it at OS-installation time, does it updates anything at BIOS level or anywhere other than HDD? That’s because I’m going to dual boot Windows 7 with Windows 8.1, and after installing Windows 7 when I install Windows 8.1 & load the IRST driver for that, is there any chance of any “overwriting” or OS-incompatibility? In short, is there anything specific to follow while installing the second OS?

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• Rack layout for future growth

  - by bleything

  We're getting ready to move to a new colo facility and I'm designing the rack layout. While we have a full rack, we only have 12U worth of hardware right now: 1x 1U switch 7x 1U servers 1x 2U server 1x 2U disk shelf The colo facility requires us to front-mount the switch and use a 1U brush strip, so we'll be using a total of 13U of space. Regarding growth, I'm reasonably sure we'll be adding another 4U in servers, 1-2U of network gear, and 2-4U of storage in the mid-term. Specific questions I'm hoping to get help with: where should I mount the switch? the LEDs are on top... should I group the servers by function with space for adding new machines? as an alternative, should I group servers based on whether they are production or staging? where in the rack should I start? in the middle? at the top? at the bottom? equally spaced? Here's a silly little ASCII diagram of what I'm thinking right now. Please feel free to tear my design apart, I've really no idea what I'm doing :) Any advice is very welcome. edit: to be clear, the colo is providing redundant power with UPS and generator, so that's why there's no power gear in the plan, except for the 0U PDU that I didn't diagram. 42 | -- switch ---------------------- 41 | -- brush strip ----------------- 40 | ~~ reserved for second switch ~~ 39 | ~~ reserved for firewall ~~~~~~~ 38 | 37 | -- admin01 --------------------- 36 | 35 | -- vm01 ------------------------ 34 | -- vm02 ------------------------ 33 | ~~ reserved for vm03 ~~~~~~~~~~~ 32 | ~~ reserved for vm04 ~~~~~~~~~~~ 31 | ~~ reserved for vm05 ~~~~~~~~~~~ 30 | 29 | -- web01 ----------------------- 28 | -- web02 ----------------------- 27 | ~~ reserved for web03 ~~~~~~~~~~ 26 | ~~ reserved for web04 ~~~~~~~~~~ 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | -- db01 ------------------------ 15 | +- disks ----------------------+ 14 | +------------------------------+ 13 | ~~ reserved for more ~~~~~~~~~~~ 12 | ~~ db01 disks ~~~~~~~~~~~~~~~~~~ 11 | 10 | +- db02 -----------------------+ 9 | +------------------------------+ 8 | ~~ reserved for db02 ~~~~~~~~~~~ 7 | ~~ disks ~~~~~~~~~~~~~~~~~~~~~~~ 6 | ~~ reserved for more ~~~~~~~~~~~ 5 | ~~ db02 disks ~~~~~~~~~~~~~~~~~~ 4 | 3 | 2 | 1 |

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• On a failing hard drive, I am able to view data but unable to copy it - why?

  - by Tom

  I have a 2.5" external hard drive that is failing. It's not making the expected 'clicking' noise that most hard drives and I am able to view the data, but I am unable to actually retrieve the data. I attempted to use SpinRite in order to access the data on the drive, but it didn't like the external drive. When I view the drive's property page, the drive shows that it's used space is at 100% and that it has 0 bytes available; however, the progress indicator under the drive icon in Windows Explorer shows that it's roughly 50% full (which is correct). When I attempt to run Windows' "Error Checking" tool and attempt to "scan for an attempt recovery of bad sectors," the tool begins to run then immediately closes with no error message. I am able to browse the contents of the drive using Windows Explorer. When I begin to try copying any given single file, the copy process begins, an indicator starts, and then the copy fails with no real error message. The Disk Management page in Computer Management under Control Panel also shows this drive has being 'Healthy.' I dropped the drive off at a data recovery store and they said that "The data seems to be intact, but an internal failure is preventing any information from being retrieved." They offered to provide me references to a data recovery specialist. I've also attempted to run CHKDSK on the drive (with and without arguments) but it returns the following error: The type of the filesystem is RAW. CHKDSK is not available for RAW drives. Before going the route of more expensive data recovery, I'm wondering if these symptoms sound familiar to anyone? Other questions... I'm willing to continue trying tools such as TestDisk and/or PhotoRec (as the majority of the data that I'd like to salvage are photos) but how long I should expect either tool to run given approximately 400GB of data? I'm also comfortable using Linux so I welcome any suggestions for utilities or tools and strategies with which you've had success.

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• Macbook Pro Triple Boot OS X Lion, Windows 7 and Windows 8

  - by Lloyd Sparkes

  MacBook Pro (Summer 2010 Model, Basic Model) I currently have OS X Lion and Windows 7 running side by side on my MacBook Pro. However I have a need to get Windows 8 running as well in this mix (a Virtual Machine is not good enough, I need the performance). I have created a suitably sized parition (80GB) that is recognizable in Boot Camp. However every time I try to boot from the USB stick (that worked to install Windows 8 on my PC) using the latest version of rEFIt, it just boots Windows 7 and not the Windows 8 installer. I cannot start the installation within Windows 7 as it will just install over Windows 7. I'm guessing the Boot Camp emulation is doing something werid to stop the "Press any key to install Windows..." message from appearing (which should happen if the installer detects Windows is already installed (e.g. if you left your install disk in). Is there a way to get around this / force the installer to start? (Note I cannot start the Windows 7 installer either if I wanted to install a second copy of Windows 7 to upgrade to Windows 8)

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• Ubuntu 10.04 - Add RAID 1 Array?

  - by N Rahl

  I have an existing Ubuntu 10.04 desktop system setup and running on a hard drive (Drive A). I'd like to add 2 more hard drives (Drives B & C, same size) to the system and mount them as a RAID 1 array. How do I do that? I know how to create RAID arrays during the installation, but I don't want to reinstall my system, and I shouldn't have to since my system files will stay on their own drive separate from the RAID array. I've physically added both drives to the system, and formatted them as EXT3 with gparted. Ubuntu's disk utility has a "create raid" option, but it won't let me select any of my drives (it thinks they're all full). I don't mind using mdadm, but I've found several guides that are old, and give conflicting advice. Some say I have to edit an /etc/raidtab file, some say this is done automatically. So what's the current (Ubuntu 10.04) preferred way of adding a RAID 1 to an existing system? It should turn into a raid at boot, and mount itself in /home/myname/files/. Thanks!

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• File sharing for small, distributed, non-technical, non-profit organization?

  - by mnmldave

  Problem: I've started volunteering for a small non-profit with fewer than five non-technical Windows users who need to share 20-30GB of files (Office documents, images, PDFs, etc.) amongst themselves online. Background: The users are accustomed to a Windows network share on a machine that backed up their data locally. An on-site "disaster" has forced them to work from their homes for awhile and to re-evaluate their file sharing needs (office was located in an old building with obvious electrical issues, etc.). Access to time from volunteers with IT experience seems to be difficult. Demonstrably minimizing energy consumption is a nice-to-have. I'm currently considering Jungle Disk (a Desktop account shared amongst the handful of employees since their TOS and my inquiries to their helpdesk seem to indicate this is permissible). It appears easy-to-use, inexpensive, secure, has backup functionality, and can scale to accomodate more data when needed. I've not used it myself though (have only used Dropbox for personal use) and systems isn't my area of expertise, so am worried I might be jumping on a bandwagon. That said, any suggestions, thoughts or similar experiences would be really appreciated.

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• Change which server mailbox is associated with in Exchange 2007

  - by tacos_tacos_tacos

  I have restored and mounted an EDB file onto a new Exchange 2007 Server. However, the old server is still online and although all the mailboxes I need are in the newly-mounted database, in Exchange 2007 System Manager it still shows that the mailbox is associated with the old server. If I try to "Move" the database it actually tries to copy the files from the old server to the new server, which is not necessary because they are already there - and produces and error about the mailbox on the destination already existing. How can I simply tell Exchange (AD?) to use the new server to find the mailbox rather than the old? Edit: I did the restore by taking the old server offline (turning off all Exchange services), copying EDB file to the new server, restoring it with eseutil, and mounting it to the new server. I did it this way in part because I didn't know a better way and in part because I couldn't use move-mailbox as the source location had a horrible Internet connection (which is why Exchange is being moved to the new location). I had to copy the EDB from the old server to a hard disk, go somewhere with a better Internet connection, upload the EDB to the new server.

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• How to deduplicate 40TB of data?

  - by Michael Stauffer

  I've inherited a research cluster with ~40TB of data across three filesystems. The data stretches back almost 15 years, and there are most likely a good amount of duplicates as researchers copy each others data for different reasons and then just hang on to the copies. I know about de-duping tools like fdupes and rmlint. I'm trying to find one that will work on such a large dataset. I don't care if it takes weeks (or maybe even months) to crawl all the data - I'll probably throttle it anyway to go easy on the filesystems. But I need to find a tool that's either somehow super efficient with RAM, or can store all the intermediary data it needs in files rather than RAM. I'm assuming that my RAM (64GB) will be exhausted if I crawl through all this data as one set. I'm experimenting with fdupes now on a 900GB tree. It's 25% of the way through and RAM usage has been slowly creeping up the whole time, now it's at 700MB. Or, is there a way to direct a process to use disk-mapped RAM so there's much more available and it doesn't use system RAM? I'm running CentOS 6.

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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 Update: This is on virtual ESXi hardware with an additional pass-through HBA. There is no controller 0 on the machine, that is for sure. devfsadm -C cleans up all the c0 device symlinks but keeps the already linked controllers at their current ids.

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• running automated fsck on remote server

  - by GriffinHeart

  I had another question about df, and now i came to conclusion i need to run fsck my partition, i've been reading about it and would like some advice, if possible. The situation is like this, no physical access to the server and i want to run fsck. from what i read i just need to touch /forcefsck and when i reboot it will run fsck. My question is, at its basis, with what arguments will the fsck run? Will it need user input to correct errors, etc? and after running will it save a log of what happened? if this was how it ran it would be perfect, anyway of enforcing that on reboot? fsck -v -p /machine/disk/p1 2>&1 > fscklog.txt Also here they describe this: it's also a good idea on debian and debian-derivatives like ubuntu to edit /etc/default/rcS on remote servers and set "FSCKFIX=yes" that adds "-y" to the boot time fsck, so it doesn't risk the remote server being stuck waiting for someone to login at the console and run fsck. But on Centos that doesn't seem to exist I only have ssh access at the moment so that is why i'm being so picky with it. here's some info about disks and mounted volumes on the server: http://pastebin.centos.org/33314 Thanks.

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• corrupted, hidden, wireless network adapter from "Network Connections" in Windows 7

  - by srihari reddy

  The issue is that when I install a wireless network adapter on my Windows 7 Professional machine I have no connectivity, the system tray icon has a red X. First, I tried the obvious, install updated drivers from the manufacturer. When I did this, the Network Connections icon had gray bars and there was no connectivity. So I tried installling the network adapter on a different computer on the same network and I verified that it does work with no issues. Next, I ran scan disk with no issues. Next, I ran sfc as admin with no issues. At this point I turned to the router and turned SSID broadcast on but that didn't help. I turned MAC address filtering off at the router but that didn't help. Whenever I installed the original network adapter (a wireless N usb adapter with WPA2 TKIP+AES) it showed up as "Wireless Network Connection 2" with a grayed out icon and no connectivity. Lastly, I tried installing two different "verified working" usb wireless adapters on to the Windows 7 Pro machine. The results were the same "Wireless Network Connection 2" that had a green bar icon but no connectivity. I installed the manufacturers software and it indicated the NIC was not there even thought the driver installed successfully in Device Manager. I guess I should mention, I first tried (insanely in vain) to use the (worthless) Windows Network troubleshooter. The results were....drumroll please... There is a problem with the network adapter... well No Duh! Also, during all of this the network adapter is always showing as "Working Properly" in the properties dialogue of Device Manager for the wireless NIC. I checked for hidden devices in Device Manager but there were none. Here is my fundamental question that I've tried to find in the Windows 7 support center with no luck. How do I remove/delete/uninstall network adapters from the Windows 7 registry? in particular hidden, corrupted network adapters, that used to be working.

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• DIR $file "File Not Found" vs DIR $filedir shows it....not permissions, not USB

  - by Kev

  I was having this problem before on a USB drive, but now it's happening on my main RAID5-backed hard disk: 2013-10-17 9:37 C:\>dir "C:\Shares\Shared\Reference\Safety Management System\Vid eo CD\AutoPlay\Docs\Manuel*" Volume in drive C has no label. Volume Serial Number is 3C18-E114 Directory of C:\Shares\Shared\Reference\Safety Management System\Video CD\AutoP lay\Docs 2003-09-09 11:29 PM 1,056,768 Manuel d'intervention d'urgence MFC.doc 2004-06-20 10:36 PM 139,849 Manuel d'intervention d'urgence MFC.pdf 2 File(s) 1,196,617 bytes 0 Dir(s) 196,068,691,968 bytes free 2013-10-17 9:38 C:\>dir "C:\Shares\Shared\Reference\Safety Management System\Vid eo CD\AutoPlay\Docs\Manuel d'intervention d'urgence MFC.doc" Volume in drive C has no label. Volume Serial Number is 3C18-E114 Directory of C:\Shares\Shared\Reference\Safety Management System\Video CD\AutoP lay\Docs File Not Found 2013-10-17 9:38 C:\> This is from a Command Prompt window where I went to Properties and told it I wanted to modify who it ran as. I opened it, had it run as me with the "restricted access" unchecked, then ran the above. The file in question has the following ACLs: Administrators, SYSTEM, and OurCompanyUsers. All three have full control of everything. Nobody has any Deny bits set. I am a member of Administrators. So I don't believe it's a permissions issue. It's not a USB drive, so this time there is no question of USB hardware. Windows Server 2003 Standard Edition SP2. What does this mean? Is this more likely a hardware or software problem?

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• How do I create and conveniently search through Libraries in Windows 8?

  - by mtone

  In Windows 7, I took the habit of putting most of my frequently accessed disk areas as Libraries - there were about a dozen. Typing a word in the Start menu would then give me a summary of matches by Library. For example, searching for "WPF" would tell me that I've got some results in the Books library, in the Coding library and a few other PDFs in the Downloads library, one of which I could then expand to see all results within. In Windows 8, that functionality appears to be gone. The Search function in the Charms Bar lists tons of results by type (Documents, Pictures, et cetera) but not by Library. This is practically useless since Documents contains hundreds of .txt and .cs files, a few of which might be Books or Downloads. The only option I found is to go into Explorer and use the search bar in the Library section. However, there again, all search results are mixed together, and I can't seem to find a way to know which Library each result came from (in the Details view, I didn't find a Library column I could add). So, if I want to know which Library contains stuff about a given topic, I have to search the Libraries one by one. Very inconvenient. Is Microsoft slowly deprecating libraries? Any tips? How else can I search through libraries?

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• Cheapest iSCSI SAN for Windows 2008/SQL Server clustering?

  - by MichaelGG

  Are there any production-quality iSCSI SANs suitable for use with Windows Server 2008/SQL Server for failover clustering? So far, I've only seen Dell's MD3000i, and HP's MSA 2000 (2012i), which both are around $6K with a minimal disk configuration. Buffalo (yea, I know), has a $1000 device with iSCSI support, but they say it will not work for 2008 failover clustering. I'm interested in seeing something suitable for failover in a production environment, but with very low IO requirements. (Clustering, say, a 30GB DB.) As for using software: On Windows, StarWind seems to have a great solution. But it's actually more money than buying a hardware SAN. (As I understand, only the enterprise edition supports having replicas, and that's $3000 a license.) I was thinking I could use Linux, something like DRBD + an iSCSI target would be fine. However, I haven't seen any free or low-cost iSCSI software that supports SCSI-3 persistent reservations, which Windows 2008 needs for failover clustering. I know $6K isn't much at all, just curious to see if there are practical cheaper solutions out there. And finally, yes, the software is expensive, but many small business get MS BizSpark, so the Windows 2008 Enterprise / SQL 2008 licenses are completely free.

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• Xen guests accessing LUNs

  - by mechcow

  We are using RHEL5.3 with a Clarion SAN attached by FC. Our situation is that we have a number of LUNs presented to Hosts and we want to dynamically present the LUNs to Xen Guests. We are not sure on what the best practice approach is to set this up. The Xen guests will form a cluster together and need the LUNs only for data partitions, i.e. when they are actively running services. So one approach would be to always present all disks to all Xen guests, and then rely up on the cluster software, and mount itself, to not mount the disk twice in two locations. This sounds kinda risky and also is not very secure (one cracked guest can see/destroy all the data). Another approach would be to dynamically add and remove the disks from the Xen guests at the dom0 level (using xm block-attach). This could work but sounds slightly complicated, I'm wondering whether Red Hat Cluster Suite supports this in some way or whether there are scripts to do this. Yet another approach would be to have the LUNs endpointed at the Xen guests themselves - I'm not sure whether this is technically possible since the multipathing has to be done at the Host level.

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• Xen networking is inconsistent in multiple ways

  - by WildVelociraptor

  I've been running xen for a few weeks now on an Ubuntu 12.04 server. I've got 3 guests: a Windows Server 2003 guest, an Ubuntu guest, and a Windows 7 Guest. My Server 2003 guest seems to work fine; I can ping it from the network, the hostname resolves correctly, and it can see the internet. This guest is attached to xenbr0, and its IP is 10.100.1.21. My Win7 guest is what is driving me crazy. I use the same configuration script as a base, changing the important parts (hostname and boot disk, mainly). It installed correctly, and is currently running, but I am unable to ping this guest. It's hostname is "alexander", with an IP of 10.100.1.22. It is also using xenbr0. The guest can ping the firewall and various IP addressess, but seems unable to resolve hostnames. Now heres the weird part: when I use rdesktop (RDP client) from my laptop (not the xen host) to connect to alexander, it works just fine. It apparently resolves the hostname fine, and does the same with the IP address. So, can someone tell me why I can access this guest using RDP, but not using ping, nslookup, traceroute, etc? It's apparently invisible to all but RDP. Also, is it okay to use two guests on the same bridge, or do i need different ones for each guest? Thanks in advance for any help. Regards

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• Monit - script not being executed as expected

  - by Thaís

  I'm working on a Windows 7 machine, having a VM for Ubuntu (image disk: 12.04-desktop-i386.iso). On the VM I installed Monit 5.3.2, and configured some processes and applications. So I created a script to run my application. This application should display some content on the screen (Im basically displaying two images, using Feh). The thing is: if I call my script through the command line, it runs ok, and display the images. But if I run through monit, it seems to be running ok, but it doesn't display the images.In the case I try to debug it (remote debug), then I can see the images. So I was supposing this could be some kind of configuration, but didn't find out what (even using the option -I wou'ldn't work). I"m showing below more details: -Piece of script on Monit---- check program runMediaHandler with path "/usr/bin/runMediaHandler.sh" if status == 1 then alert -runMediaHandler.sh ---- #!/bin/bash java -jar /home/thais/Desktop/MediaHandler_RC2.jar Summarizing: 1.What works: if I run java directly: java -jar /home/thais/Desktop/MediaHandler_RC2.jar if I run the script directly: runMediaHandler.sh if I remote debug putting a breakpoint where the image should be displayed 2.What does not work: putting that piece of information on Monit to "check program", writen above (even if calling monit -I start runMediaHandler) Thank you in advance, Thaís

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• Using AddEncoding x-gzip .gz without actual files

  - by STATUS_ACCESS_DENIED

  With Apache (2.2 and later) how can I achieve the following. I want to transparently compress using GZip encoding (not plain Deflate) the output when a certain file is queried with its name plus the extension .gz, where the .gz version doesn't physically exist on disk. So let's say I have a file named /path/foo.bar and no file foo.bar.gz in the folder to which the URI /path maps, how can I get Apache to serve the contents of /path/foo.bar but with AddEncoding x-gzip ... applied to the (non-existing) file? The rewrite part appears to be easy, but the problem is how to apply the encoding to a non-existent item. The other way around also seems to be simple as long as the client supports the encoding. Is the only solution really a script that does this on the fly? I'm aware of mod_deflate and mod_gzip and it is not what I'm looking for - at least not alone. In particular I need an actual GZIP file and not just a deflated stream. Now I was thinking of using mod_ext_filter, but couldn't bridge the gap between rewriting the name of the (non-existent) file.gz to file on one side and the LocationMatch on the other. Here's what I have. RewriteRule ^(.*?\.ext)\.gz$ $1 [L] ExtFilterDefine gzip mode=output cmd="/bin/gzip" <LocationMatch "/my-files/special-path/.*?\.ext\.gz"> AddType application/octet-stream .ext.gz SetOutputFilter gzip Header set Content-Encoding gzip </LocationMatch> Note that the header for Content-Encoding isn't really needed by the clients in this case. They expect to see actual GZIP files, but I want to do this on-the-fly without caching (this is a test scenario).

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• ext4 filesystem corruption -- maybe hardware error?

  - by pts

  I'm getting these errors in dmesg after about half an hour after I turn on the computer: [ 1355.677957] EXT4-fs error (device sda2): htree_dirblock_to_tree: inode #1318420: (comm updatedb.mlocat) bad entry in directory: directory entry across blocks - block=5251700offset=0(0), inode=1802725748, rec_len=179136, name_len=32 [ 1355.677973] Aborting journal on device sda2-8. [ 1355.678101] EXT4-fs (sda2): Remounting filesystem read-only [ 1355.690144] EXT4-fs error (device sda2): htree_dirblock_to_tree: inode #1318416: (comm updatedb.mlocat) bad entry in directory: directory entry across blocks - block=5251699offset=0(0), inode=2194783952, rec_len=53280, name_len=152 [ 1356.864720] EXT4-fs error (device sda2): htree_dirblock_to_tree: inode #1312795: (comm updatedb.mlocat) bad entry in directory: directory entry across blocks - block=5251176offset=1460(13748), inode=1432317541, rec_len=208208, name_len=119 /dev/sda is an SSD, and it's using the noop scheduler. /etc/fstab entry: UUID=acb4eefa-48ff-4ee1-bb5f-2dccce7d011f / ext4 errors=remount-ro,noatime,discard,user_xattr 0 1 System information: $ cat /proc/mounts | grep /dev/sd /dev/sda1 /boot ext2 rw,noatime,errors=continue 0 0 $ cat /etc/lsb-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=10.04 DISTRIB_CODENAME=lucid DISTRIB_DESCRIPTION="Ubuntu 10.04.3 LTS" $ uname -a Linux leetpad 2.6.35-30-generic-pae #61~lucid1-Ubuntu SMP Thu Oct 13 21:14:29 UTC 2011 i686 GNU/Linux I've run memtest for 7 hours, it didn't found any memory errors. Any obvious ideas what can go wrong in this case? The most reasonable thing I can imagine is that the SSD is silently dropping some write requests, which eventually leads to an EXT4 filesystem inconsistency (but no disk I/O errors). How can this happen? Is there a relevant configuration option I should ensure to be set correctly? What tools should I use to diagnose the hardware failures? Would it be possible to diagnose the SSD failure without overwriting data?

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• PHP/MySQL Performance Testing with Just PHP

  - by Mike Gifford

  I'm trying to diagnose a server where the website is loading very slowly, but unfortunately my client has only provided me with FTP access. I've got FTP access so I can upload PHP scripts, but can't set up any other server side tools. I have access to phpMyAdmin, but not direct access to the MySQL server. It is also unfortunately a Windows server (and we've been a Linux shop for over a decade now). So, if I wan to evaluate MySQL & disk speed performance through PHP on a generic server, what is the best way to do this? There are already tools like: https://github.com/raphaelm/php-benchmark or https://github.com/InfinitySoft/php-benchmark But I'm surprised there isn't something that someone has already set up & configured to just run through and do some basic testing of a server's responsiveness. Every time we evaluate a new server environment it's handy to be able to compare it to an existing one quickly to see if there are any anomalies. I guess I'd just hoped that someone else had written up a script to do this already. I know I have, but that was before Github when there was a handy place to post scraps of code like this. Originally posted in http://stackoverflow.com/questions/12321498/php-mysql-performance-testing-with-just-php but it was recommended that I re-post it here.

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• How to Refresh or Reset Windows 8 without the System Reserved partition?

  - by Karan

  The article Refresh and reset your PC mentions exactly what happens during the refresh and reset operations in Windows 8: Refresh The PC boots into Windows RE. Windows RE scans the hard drive for your data, settings, and apps, and puts them aside (on the same drive). Windows RE installs a fresh copy of Windows. Windows RE restores the data, settings, and apps it has set aside into the newly installed copy of Windows. The PC restarts into the newly installed copy of Windows. Reset The PC boots into the Windows Recovery Environment (Windows RE). Windows RE erases and formats the hard drive partitions on which Windows and personal data reside. Windows RE installs a fresh copy of Windows. The PC restarts into the newly installed copy of Windows. It is my understanding that Windows RE (Recovery Environment) is included as part of the System Reserved partition created by default on the first hard disk. The size of this partition has gone up to 350 MB from the 100 MB it used to be in Vista/Windows 7, no doubt as a result of adding these features. Now we have already discussed how to skip the creation of this System Reserved partition during Setup. Basically, the same techniques that used to work with Windows 7 work with Windows 8 as well. What I want to know is, what will be the exact repercussions of not having the System Reserved partition in place? I assume Troubleshoot / Advanced options should still be available as before: But what about the Troubleshoot menu itself? Will the Refresh and Reset options disappear? Will they remain but be unavailable? Or possibly they will throw an error if selected? Also, will it be possible to access and successfully execute these options if installation media is available? Anything else that might be affected?

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• Using ZFS or XFS on a Xen guest running Linux

  - by zoot

  Background: I'm investigating the viability of using a filesystem other than ext3/4, with the ability to run snapshots for backup and rollback purposes. The servers under consideration are mailbox server nodes running on Linode's Xen based VPS platform. I'm particularly drawn to the various published benefits which ZFS offers in terms of data integrity and this year's stable release of native ZFS support in Linux - http://zfsonlinux.org ZFS appears to be the more thorough option in terms of benefits and simplicity (instead of LVM+XFS). Please note that I have little experience with ZFS (which I use on a local FreeNAS installation) and none with XFS, hence the post. To date, my servers are using ext3 filesystems, not managed under LVM. Question in detail: So, I have two questions. (1) Which of the two filesystems would be the better choice for the best of all of the following 3 aspects, running on a Xen Linux guest? Snapshots Data Integrity Performance (2) If ZFS is a viable option, is it practical to use ZRAID across Xen disk images to further enhance the solution for data integrity? Note: I'm reluctant to consider btrfs, given the many warnings I've read about in using it on production systems.

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• Identifying and Resolving Oracle ITL Deadlock

  - by Allan

  I have an Oracle DB package that is routinely causing what I believe is an ITL (Interested Transaction List) deadlock. The relevant portion of a trace file is below. Deadlock graph: ---------Blocker(s)-------- ---------Waiter(s)--------- Resource Name process session holds waits process session holds waits TM-0000cb52-00000000 22 131 S 23 143 SS TM-0000ceec-00000000 23 143 SX 32 138 SX SSX TM-0000cb52-00000000 30 138 SX 22 131 S session 131: DID 0001-0016-00000D1C session 143: DID 0001-0017-000055D5 session 143: DID 0001-0017-000055D5 session 138: DID 0001-001E-000067A0 session 138: DID 0001-001E-000067A0 session 131: DID 0001-0016-00000D1C Rows waited on: Session 143: no row Session 138: no row Session 131: no row There are no bit-map indexes on this table, so that's not the cause. As far as I can tell, the lack of "Rows waited on" plus the "S" in the Waiter waits column likely indicates that this is an ITL deadlock. Also, the table is written to quite often (roughly 8 insert or updates concurrently, as often as 240 times a minute), so and ITL deadlock seems like a strong possibility. I've increased the INITRANS parameter of the table and it's indexes to 100 and increased the PCT_FREE on the table from 10 to 20 (then rebuilt the indexes), but the deadlocks are still occurring. The deadlock seems to happen most often during an update, but that could just be a coincidence, as I've only traced it a couple of times. My questions are two-fold: 1) Is this actually an ITL deadlock? 2) If it is an ITL deadlock, what else can be done to avoid it? Cross-posted from Stack Overflow. Deadlocks are normally a programming problem, but ITL deadlocks relate directly to how Oracle writes to disk, so this may be an area where DBAs have more experience.

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• Force spin-down of external hard-drive on linux (raspberry pi)

  - by user258346

  I'm currently setting up a home-server using a Raspberry Pi with an external hard-disk connected via usb. However, my hard-drive will never spin down when being idle. I tried already the hints provided at raspberrypi.org ... without any success. 1.) sudo hdparm -S5 /dev/sda returns /dev/sda: setting standby to 5 (25 seconds) SG_IO: bad/missing sense data, sb[]: 70 00 04 00 00 00 00 0a 00 00 00 00 44 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 2.) sudo hdparm -y /dev/sda returns /dev/sda: issuing standby command SG_IO: bad/missing sense data, sb[]: 70 00 04 00 00 00 00 0a 00 00 00 00 44 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ...and 3.) sudo sdparm --flexible --command=stop /dev/sda returns /dev/sda: HDD 1234 ... without spin-down of the drive. I use the following hardware: Inateck FDU3C-2 dual Ports USB 3.0 HDD docking station Western Digital WD10EZRX Green 1TB Is it possible, that the sent spin-down-signals are somewhere overwritten/lost/ignored?

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