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• Compaq Presario R3000 randomly fails to boot on 11.10, 12.04, 12.10

  - by dlfuller

  I’m trying to figure what to do with random failures to boot. My old HP Presario R3000 with AMD Athlon XP-M sometimes boots, sometimes hangs with a blank screen during boot, and sometimes hangs on shutdown. After a few boot attempts it will finally boot to the GNU GRUB screen where I usually can select Recovery Mode, then select return to a normal boot, and the thing will startup and function normally. The pattern is not repeatable and seemed to start after upgrading from 11.04. Clean installs of 12.04 and 12.10 on newly-formatted hard drives make no difference. If this might be a clue, hangs on shutdown often stop at a line with: “pcmcia_socket pcmcia_socket0: cs: IO port probe 0x3000-0x7fff: excluding 0x3000-0x30ff 0x3400-0x34ff 0x3800-0x38ff 0x3c00-0x3cff”. I did try the “acpi=off” modification from 11.10 randomly fails to boot on Compaq Presario R3000 with no change in these random boot failures. Any suggestions sure appreciated.

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• Handling Backups for Rapid Resilience

  The backup and restore system in SQL Server hasn't changed a great deal over the years despite a huge growth in the typical size of databases. When disaster strikes, and an important service is taken offline while a restore is performed, there is often time to reflect on whether it might be possible to design databases for a more rapid recovery of the most critical parts of a database application. Uncover the flexibility of custom metricsKeep up to date from anywhere with SQL Monitor, and monitor the most important data for your servers and applications. Download a free trial.

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• resizing partitions

  - by venetin

  I have the following configuration: sda1 1 GB maybe fat32 (windows recovery partition) sda2 40 GB ntfs(windows drive c) with boot flag sda3 around 100GB ntfs(storage partition) sda4 extended partition:sda5 10 GB ext4 partition sda6 1 GB linux swap I want to make this changes: sda2 30 GB resize(decrease size with 10 GB) sda3 around 100GB(move and maybe decrease size with 4-5 GB) sda4 around 20-22 GB (move and increase size with 10-15GB) sda5 around 20 GB (move and increase size with 10-12 GB) sda6 2 GB (move and increase size with 1 GB) Is it safe to do this operations?Will i lose grub? I will do the changes with gparted on puppy linux live usb. Thanks

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• Cant get to install menu, liveCD

  - by user204979

  When I tried to run the Ubuntu install disc i get a purple screen with some little images down the bottom, then a flashing cursor for a second and then the screen goes black like there is no in I have tried changing BIOS settings that supposedly interfere, different disk drives and trying to access the advanced menu all to no avail! All the answers for black screens require you to be able to get the menu which i cant! Help would be much appreciated!

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• Getting the Most out of Statistics

  Statistics keep track of our data and will tell SQL Server how to make the best optimization decisions. Knowing how they work can make understanding query and performance problems much easier! Free eBook - Performance Tuning with DMVsThis free eBook provides you with the core techniques and scripts to monitor your query execution, index usage, session and transaction activity, disk IO, and more. Download the free eBook.

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• Analyzing I/O performance in Linux

  <b>cmdln.org:</b> "Monitoring and analyzing performance is an important task for any sysadmin. Disk I/O bottlenecks can bring applications to a crawl. What is an IOP? Should I use SATA, SAS, or FC? How many spindles do I need?"

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• Unable to access “430 GB Volume”

  - by user170924

  Error mounting /dev/sda3 at /media/fehr/D42CAFD92CAFB4C0: Command-line `mount -t "ntfs" -o "uhelper=udisks2,nodev,nosuid,uid=1000,gid=1000,dmask=0077,fmask=0177" "/dev/sda3" "/media/fehr/D42CAFD92CAFB4C0"' exited with non-zero exit status 14: The disk contains an unclean file system (0, 0). Metadata kept in Windows cache, refused to mount. Failed to mount '/dev/sda3': Operation not permitted The NTFS partition is in an unsafe state. Please resume and shutdown Windows fully (no hibernation or fast restarting), or mount the volume read-only with the 'ro' mount option.

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• SLOB: ?????????????

  - by katsumii

  Oracle DB????????????????????????????Introducing SLOB – The Silly Little Oracle Benchmark « Kevin Closson's Blog: Platforms, Databases and StorageSLOB supports testing Oracle logical read (SGA buffer gets) scalingSLOB supports testing physical random single-block reads (db file sequential read)SLOB supports testing random single block writes (DBWR flushing capacity)SLOB supports testing extreme REDO logging I/O????????????????Oracle?????????Swingbench ??????????IPC Semaphore?????C???????????????????Windows???????????Cygwin??????????????????????????????SwingbenchSwingbench can be used to demonstrate and test technologies such as Real Application Clusters, Online table rebuilds, Standby databases, Online backup and recovery etc.???????I/O?????????????????Oracle ORION DownloadsORION (Oracle I/O Calibration Tool) is a standalone tool for calibrating the I/O performance for storage systemsSLOB ??????????????????????????? 

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• ??????????

  - by Allen Gao

  ???????RAC??????????????????10gR2?11gR1.??????????????CRS???????1.ocssd : ???????????(Node Monitoring)????(Group Management),??CRS????????????????????????,????????????(network heartbeat)?????(disk heartbeat)???,?????????????????????,????????????,??????????????????,?????node kill escalation(???11gR1????????),??????????????????????????(reboot time,???3?)????????:ocssd.bin??????????????????????????,??????????????????????????????,misscount(???30?,??????????????600?),????????????,???????????????????,?????????????2???,??????,??????????????,?????????????????????:ocssd.bin?????????????(Voting File)??????????,?????????????????????????????,disk timeou(???200?),?????????????????????,CRS???[N/2]+1????????,??N??????,??????2.oclsomon:????????ocssd????,????ocssd.bin??????,???????3.oprocd:??????Linux?Unix??,????????????????????????????????,?????????:????????????init.cssd?????????????????????????1.??????2.<crs???>/log/<????>/cssd/ocssd.log3.oprocd.log(/etc/oracle/oprocd/*.log.* ? /var/opt/oracle/oprocd/*.log.*)4.<crs???>/log/<????>/cssd/oclsomon/oclsomon.log5. Oracle OSWatcher ????????????????????1.?ocssd???????????ocssd.log???????,????????????????????????????????,???????,OSW??(traceroute???),???????(cluster interconnect)??????,?????????[ CSSD]2012-03-02 23:56:18.749 [3086] >WARNING: clssnmPollingThread: node <node_name> at 50% heartbeat fatal, eviction in 14.494 seconds[ CSSD]2012-03-02 23:56:25.749 [3086] >WARNING: clssnmPollingThread: node <node_name> at 75% heartbeat fatal, eviction in 7.494 seconds[ CSSD]2012-03-02 23:56:32.749 [3086] >WARNING: clssnmPollingThread: node <node_name>at 90% heartbeat fatal, eviction in 0.494 seconds[CSSD]2012-03-02 23:56:33.243 [3086] >TRACE:   clssnmPollingThread: Eviction started for node <node_name>, flags 0x040d, state 3, wt4c 0[CSSD]2012-03-02 23:56:33.243 [3086] >TRACE:   clssnmDiscHelper: <node_name>, node(4) connection failed, con (1128a5530), probe(0)[CSSD]2012-03-02 23:56:33.243 [3086] >TRACE:   clssnmDiscHelper: node 4 clean up, con (1128a5530), init state 5, cur state 5[CSSD]2012-03-02 23:56:33.243 [3600] >TRACE:   clssnmDoSyncUpdate: Initiating sync 196446491[CSSD]2012-03-02 23:56:33.243 [3600] >TRACE:   clssnmDoSyncUpdate: diskTimeout set to (27000)ms??:???????ocssd.log?????????????????????,?????????????????????ocssd.log???????,??????????????????????????????,OSWatcher??(iostat???),???i/o????????,?????????2010-08-13 18:34:37.423: [    CSSD][150477728]clssnmvDiskOpen: Opening /dev/sdb82010-08-13 18:34:37.423: [    CLSF][150477728]Opened hdl:0xf4336530 for dev:/dev/sdb8:2010-08-13 18:34:37.429: [   SKGFD][150477728]ERROR: -9(Error 27072, OS Error (Linux Error: 5: Input/output errorAdditional information: 4Additional information: 720913Additional information: -1))2010-08-13 18:34:37.429: [    CSSD][150477728](:CSSNM00060: )clssnmvReadBlocks: read failed at offset 17 of /dev/sdb82010-08-13 18:34:38.205: [    CSSD][4110736288](:CSSNM00058: )clssnmvDiskCheck: No I/O completions for 200880 ms for voting file /dev/sdb8)2010-08-13 18:34:38.206: [    CSSD][4110736288](:CSSNM00018: )clssnmvDiskCheck: Aborting, 0 of 1 configured voting disks available, need 12010-08-13 18:34:38.206: [    CSSD][4110736288]###################################2010-08-13 18:34:38.206: [    CSSD][4110736288]clssscExit: CSSD aborting from thread clssnmvDiskPingMonitorThread 2010-08-13 18:34:38.206: [    CSSD][4110736288]###################################2. ?oclsomon???????????oclsomon.log ?????,??????????ocssd????,??ocssd??????(RT)???,?????????????(?cpu)??,?????????????,OSW??(vmstat,top???),?????????3.?oprocd???????????oprocd?????????,?????????oprocd????? Dec 21 16:15:30.369857 | LASTGASP | AlarmHandler:  timeout(2312 msec) exceeds interval(1000 msec)+margin(500 msec).   Rebooting NOW.??oprocd?????????????????????,?????ntp(?????????),??diagwait=13 ????????,??,?????????????,??????CRS,???????????????,??????????????oprocd????,??,?????OSWatcher??(vmstat,top???),??????????????????????????????,????????????????? ???????,??????MOS ???Note 265769.1 :Troubleshooting 10g and 11.1 Clusterware RebootsNote 1050693.1 :Troubleshooting 11.2 Clusterware Node Evictions (Reboots)

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• "shutting down hyper-v virtual machine management service"

  - by icelava

  I have a Windows 2008 R2 server that is a Hyper-V host (Dell PowerEdge T300). Today for the first time I encountered an odd situation; i lost connection with one of the guest machines but logging on physically it seems the guest OS is still running but no longer contactable via the network. I tried to shut down the guest machine (Windows XP) but it would not shut down, getting stuck in a "Not responding" dialog box that cannot be dismissed. I used the Hyper-V management console to reset the machine and it could not get out of resetting state. I tried to save another Windows 2003 guest machine, and it would be progress with its Saving state (0%). The other running Windows 2003 guest was stuck in the logon dialog. My first suspicion is perhaps one of the Windows update patches this week (10 Nov 2011) may something to do with it, which was still pending a system restart. Well, since I could not do anything with Hyper-V i proceeded with the Windows Update restart, and now it is stuck half an hour at "Shutting down hyper-v virtual machine management service" Prior to restarting I did not observe any hard disk errors reported in the system event log; doubt it is a disk-related condition. Shall I force a hard reboot? UPDATE As per answer report, it eventually restarted itself.

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• Oracle VM repository creation seems contradictory to its server pool?

  - by Michael

  I found something contradictory in Oracle VM. Clustered server pool creation in Oracle VM would format my FC LUN as ocfs2 , and start o2cb & ocfs2 services to build cluster environment. After that, when I wanted to create repository on the serverpool, unexpectedly, it told me that the physical disk I chose which is also my FC LUN, already contains a file system. What a contradictory! So what, delete the file system in serverpool? If so, why created it before?! OVM> list physicaldisk Command: list physicaldisk Status: Success Time: 2012-09-10 06:44:42.660 Data: id:0004fb00001800007765e62381895f61 name:OVM_HDS OVM> create serverpool clusterenable=true virtualip=10.84.21.123 physicaldisk=OVM_HDS name=ovmserverpool Serverpool creation took quite a long time since my FC LUN was big. When the creation completed, my FC LUN was created as ocfs2 and o2cb & ocfs2 services were started on my ovm servers successfully. But then repository creation indeed throws me a big surprise ... OVM> create repository serverpool=ovmserverpool physicaldisk=OVM_HDS name=ovmrepo Command: create repository serverpool=ovmserverpool physicaldisk=OVM_HDS name=ovmrepo Status: Failure Time: 2012-09-10 06:23:44.656 Error Msg: com.oracle.ovm.mgr.api.exception.RuleException: OVMRU_002026E Cannot use or delete physical disk: OVM_HDS, it already contains a file system: [Pool filesystem for ovmserverpool] Mon Sep 10 06:23:44 CST 2012 What should I do now? Delete the filesystem using dd command? That would destroy the serverpool, right? I'm really confused. My OVM Manager version is 3.1.1.399 which is the latest. Any tips are appreciated. Thanks.

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• Adaptec 6405 RAID controller turned on red LED

  - by nn4l

  I have a server with an Adaptec 6405 RAID controller and 4 disks in a RAID 5 configuration. Staff in the data center called me because they noticed a red LED was turned on in one of the drive bays. I have then checked the status using 'arcconf getconfig 1' and I got the status message 'Logical devices/Failed/Degraded: 2/0/1'. The status of the logical devices was listed as 'Rebuilding'. However, I did not get any suspicious status of the affected physical device, the S.M.A.R.T. setting was 'no', the S.M.A.R.T. warnings were '0' and also 'arcconf getsmartstatus 1' returned no problems with any of the disk drives. The 'arcconf getlogs 1 events tabular' command gives lots of output (sorry, can't paste the log file here as I only have remote console access, I could post a screenshot though). Here are some sample entries: eventtype FSA_EM_EXPANDED_EVENT grouptype FSA_EXE_SCSI_GROUP subtype FSA_EXE_SCSI_SENSE_DATA subtypecode 12 cdb 28 00 17 c4 74 00 00 02 00 00 00 00 data 70 00 06 00 00 00 00 00 00 00 00 00 02 00 00 00 00 00 00 00 00 00 00 00 00 0 The 'arcconf getlogs 1 device tabular' command reports mediumErrors 1 for two of the disks. Today, I have checked the status of the controller again. Everything is back to normal, the controller status is now 'Logical devices/Failed/Degraded: 2/0/0', the logical devices are also all back to 'Optimal'. I was not able to check the LED status, my guess is that the red LED is off again. Now I have a lot of questions: what is a possible cause for the medium error, why it is not reported by the SMART log too? Should I replace the disk drives? They were purchased just a month ago. The rebuilding process took one or two days, is that normal? The disks are 2 TByte each and the storage system is mostly idling. the timestamp of the logs seem to show the moment of the log retrieval, not the moment of the incident. Please advise, all help is very appreciated.

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• How to disable the RAID in x3400 M2

  - by BanKtsu

  Hi I just wanna disable the default RAID in my server IBM System X3400 M2 Server(7837-24X),i have 3 disk drives SAS. I want to make them a JBOD "Just a Bunch Of Disks", because I want to install in the drive 0 CentOS, and the other two make them cache files for a squid server. I disable the RAID in the BIOS: System Settings/Adapters and UEFI drivers/LSI Logic Fusion MPT SAS Driver -PciRoot(0x0)/Pci(0x3,0X0)/Pci(0x0,0x0) LSI Logic MPT Setup Utility RAID Properties/Delete Array Later I boot the CentOS live CD and install the OS in the drive 0, and the others 2 mounted like this: *LVM Volume Groups vg_proxyserver 139508 lv_root 51200 / ext4 lv_home 84276 /home ext4 lv_swap 4032 Hard Drive sdb(/dev/sdb) free 140011 sdc(/dev/sdc) free 140011 sdd(/dev/sdd) sdd1 500 /boot ext4 sdd2 139512 vg_proxyserver physical volume(LVM) But when I restart the server give me the error: Boot failed Hard Disk 0 UEFI PXE PciRoot(0x0)/Pci(0x1,0X0)/Pci(0x0,0x0)/MAC(001A64B15130,0X0)) ........PXE-E18:Server response timeout. UEFI PXE PciRoot(0x0)/Pci(0x1,0X0)/Pci(0x0,0x0)/MAC(001A64B15132,0X0)) ........PXE-E18:Server response timeout. and the OS not start. The IBM force me to do a RAID?,why?

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• "Dictionary problem." Error with VMPlayer

  - by George Mauer

  I'm pretty new to using vmware virtualization (been a virtualbox user) so I'm hoping you guys can help me out. I recently got an external usb disk containing a vm for a client, downloaded vmplayer, set it up with "Open a Virtual Machine", ran it, easy as pie. After working with it a bit this morning, I shut the VM down and now trying to start it back up again I get this: I tried removing the vm from my library, now it happens whenever I try to add it back in. In the meantime, I can still access other virtual machines so it seems like the problem might be with the virtual disk. So two questions: This is obviously not a very helpful error message. Where can I go to get more information? My Application EventLog doesn't contain anything from VMWare. What steps can I take to fix the problem? Edit: A couple more pieces of information. I did not take any snapshots. I don't think VM Player even has that ability. I have a zip file of (what I assume) is the state of the VM when it was sent to me. I cannot unzip it as it is huge and simply requires more HD space than I have available but I did extract the vmx file and examine it. Other than the UUIDs and the fact that mine reads cleanShutdown = "FALSE" they are identical. The log contains the following lines Jun 23 10:11:18.080: vmx| SNAPSHOT: SnapshotConfigInfoRead: Unable to load dict from 'E:....\MachineName.vmsd'. Jun 23 10:11:18.080: vmx| SNAPSHOT: SnapshotConfigInfoRead failed for file 'E:....\MachineName.vmx': Dictionary problem (6) Jun 23 10:11:18.082: vmx| SNAPSHOT: Snapshot_TimeStampTiers failed: Dictionary problem (6)

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• Performance analytics via DBMS "plugins", or other solution

  - by Polynomial

  I'm working on a systems monitoring product that currently focuses on performance at the system level. We're expanding out to monitoring database systems. Right now we can fetch simple performance information from a selection of DBMS, like connection count, disk IO rates, lock wait times, etc. However, we'd really like a way to measure the execution time of every query going into a DBMS, without requiring the client to implement monitoring in their application code. Some potential solutions might be: Some sort of proxy that sits between client and server. SSL might be an issue here, plus it requires us to reverse engineer and implement the network protocol for each DBMS. Plugin for each DBMS system that automatically records performance information when a query comes in. Other problems include "anonymising" the SQL, i.e. taking something like SELECT * FROM products WHERE price > 20 AND name LIKE "%disk%" and producing SELECT * FROM products WHERE price > ? AND name LIKE "%?%", though this shouldn't be too difficult with some clever parsing and regex. We're mainly focusing on: MySQL MSSQL Oracle Redis mongodb memcached Are there any plugin-style mechanisms we can utilise for any of these? Or is there a simpler solution?

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• Random software/shutdown problems Mac mini

  - by Oliver

  Hello I have a Mac mini using OS X 10.5.8. Recently I've been having problems that are becoming increasingly severe. Particular symptoms: Firefox "quits" but the dot on the dock remains. If I try shutting down at this point I can't and have to use the power button. I can't start Firefox either. Significantly higher than normal crash rate for CS4 Illustrator Photoshop and Dreamweaver. If Firefox remains open when sleeping the Mac, on waking up firefox is completely unresponsive and must be restarted. Can cause problem 1. Today I lost all my FTP settings for Dreamweaver CS4 Bluetooth switches on when booting despite being switched off. Network password retention is somewhat erractic. Tried running Apple Hardware Test as described in the manual. Cannot access install disk by pressing D at startup. My pen tablet (Bamboo) lost my preferences. Tried unstalling software and now cannot re-install. I've never had problems of this level outside warranty before so I don't know much about debugging Macs. Solutions attempted: Disable bluetooth (see problem 5) Disable time machine Run appple harware test (see problem 7) Tried using activity monitor but don't know which processes are normal Tried uninstalling more recent software. I don't have any idea what to do. It seems like a hard disk failure but I don't have the know how to continue.

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• BAD ARCHIVE MIRROR using PXE BOOT method

  - by omkar

  i m trying to automatically install UBUNTU on a client PC by using the method of PXE BOOT method....my Objectives are below:- i m following the steps given in this link installation using PXE BOOT INSTALL 1:-the server will have a KICKSTART config file which contains the parameters for the OS installation and the files which are required for the OS installations. 2:-the client will have to detect this configuration along with the setup files and complete the installation without any input from the user. In my server i have installed DHCP3-server,Apache2 and TFTP for helping me with the installation. i have nearly achieved my first objective,i m able to boot my client using the files stored in the server,but during the installation stage it is asking me to "CHOOSE A MIRROR of UBUNTU ARCHIVE".i gave the server's IP address and the path in the server where the files are located but then too its giving me error "BAD ARCHIVE MIRROR". so is it possible that instead of downloading all the files from the internet and storing them on my disk , can i use the files which comes with the UBUNTU-CD, and how to store this files in what format (should i zip them ) on the disk. secondly i am also generating the ks.cfg which i wanted to give to the client for automatic installation of the OS ,so how should the configuration file be given to the installation process.

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• Excel techniques for perfmon csv log file analysis

  - by Aszurom

  I have perfmon running against several servers, where I'm outputting to a .csv file data like CPU %time, memory bytes free, hard disk I/O metrics like s/write and writes/s. The ones graphing the SQL servers are also collecting SQL stats. The web servers are collecting .Net relevant stuff. I am aware of PAL, and used it as a template of what data to capture based on server type actually. I just don't think the output it generates is detailed or flexible enough - but it does a pretty remarkable job of parsing logs and making graphs. I'm borderline incompetent with Excel, so I'm hoping to be directed to some knowledge of how to take a perfmon output .csv and mine it in Excel to produce some numbers that are meaningful to me as a sysadmin. I could of course just pick a range of data and assemble a graph out of that and look for spikes and trends, but I'm convinced there is some technique to this that makes it more manageable than looking at a monsterous spreadsheet of numbers and trying to make graphs of it. Plus, it's pretty time consuming and not something I can do as a "take a glance at the servers" sort of routine. I'm graphing CPU, disk use, network b/sec, etc. in Cacti as well, which is nice for seeing big trends. The problem is that it is 5 minute averages, so a server could have a problem but it's intermittent and washes out in a 5 min average. What do you do with perfmon data that I could learn from?

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• Have set Expiration time: Still getting "Query string present but no explicit expiration time"

  - by oligofren

  I have one local Apache instance running with mod_cache (+ disk & mem) enabled, and it seems to cache content from my appserver fine. My app server sets Expiration headers and Last-modified. Yet, when deploying on a production server with the same modules enabled, I am getting the following error in my logs: blablabla not cached. Reason: Query string present but no explicit expiration time Any clues on why Apache is not caching content? The only difference is the Apache version. Locally I am running 2.2. This is from my config CacheRoot "/var/cache/apache2/" CacheEnable disk / This is example output < HTTP/1.1 200 OK < Date: Mon, 19 Nov 2012 16:09:13 GMT < Server: Sun GlassFish Enterprise Server v2.1.1 < X-Powered-By: Servlet/2.5 < Expires: Tue Nov 20 05:00:00 CET 2012 < Last-Modified: Mon Nov 19 17:09:13 CET 2012 < Cache-Control: no-transform < Content-Type: application/x-javascript < Transfer-Encoding: chunked

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• VSS Post Backup failures for Virtual Server 2005 R2 SP1 virtual machines

  - by califguy4christ

  We've been seeing strange errors with Volume Shadow Copy services on our Virtual Server 2005 R2 SP1 host. It appears to be failing on a strange mountpoint in the C:\WINDOWS\Temp\ folders, which I believe is used by VSS to mount a writeable image file. To summarize: The Microsoft Virtual Server 2005 Writer continually goes into a failed retryable state The Virtual Server log reports errors during the Post Backup phase VSS reports errors backing up a mount point of unknown origins The mount point causes NTFS and ftdisk errors The host is x86 Windows Server 2003 Standard, SP2. The virtual machine is the same. Both use basic disks. Here is the writer state: Writer name: 'Microsoft Virtual Server 2005 Writer' Writer Id: {76afb926-87ad-4a20-a50f-cdc69412ddfc} Writer Instance Id: {78df98e2-bf19-4804-890b-15865efef3bd} State: [11] Failed Last error: Retryable error From the Virtual Server log: Virtual Server - Vss Writer - Event ID: 1035: The VSS writer for Virtual Server failed during the PostBackup phase. The guest shadow copies did not get exposed on the host machine, after mounting all the virtual hard disks of the virtual machine VMACHINE. From the Application log: VSS - None - Event ID: 12290: Volume Shadow Copy Service warning: GetVolumeInformationW( \\?\Volume{fb84bae7-87f5-11dd-9832-001cc4961ca6}\,NULL,0, NULL,NULL,[0x00000000], , 260) == 0x0000045d. hr = 0x00000000. From the System log: Ntfs - Disk - Event ID: 55: The file system structure on the disk is corrupt and unusable. Please run the chkdsk utility on the volume C:\WINDOWS\Temp\ {fb84bae7-87f5-11dd-9832-001cc49.... My current theory is that VSS creates a mount point for an image file of the VHD, then the software panics for some reason, leaving everything in an inconsistent state. Removing the mount point doesn't resolve the problem. All of the other disks check out fine with CHKDSK. There's no exclusion option for VHDs or to turn off online backups. Has anyone seen this kind of thing before or point me in the right direction for getting more information about the mount point and it's origins? I haven't been able to trace what application is creating that mount point.

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• Preseeding Ubuntu partman recipe using LVM and RAID

  - by Swav

  I'm trying to preseed Ubuntu 12.04 server installation and created a recipe that would create RAID 1 on 2 drives and then partition that using LVM. Unfortunately partman complains when creating LVM volumes saying there no partitions in recipe that could be used with LVM (in console it complains about unusable recipe). The layout I'm after is RAID 1 on sdb and sdc (installing from USB stick so it takes sda) and then use LVM to create boot, root and swap. The odd thing is that if I change the mount point of boot_lv to home the recipe works fine (apart from mounting in wrong place), but when mounting at /boot it fails I know I could use separate /boot primary partition, but can anybody tell me why it fails. Recipe and relevant options below. ## Partitioning using RAID d-i partman-auto/disk string /dev/sdb /dev/sdc d-i partman-auto/method string raid d-i partman-lvm/device_remove_lvm boolean true d-i partman-md/device_remove_md boolean true #d-i partman-lvm/confirm boolean true d-i partman-auto-lvm/new_vg_name string main_vg d-i partman-auto/expert_recipe string \ multiraid :: \ 100 512 -1 raid \ $lvmignore{ } \ $primary{ } \ method{ raid } \ . \ 256 512 256 ext3 \ $defaultignore{ } \ $lvmok{ } \ method{ format } \ format{ } \ use_filesystem{ } \ filesystem{ ext3 } \ mountpoint{ /boot } \ lv_name{ boot_lv } \ . \ 2000 5000 -1 ext4 \ $defaultignore{ } \ $lvmok{ } \ method{ format } \ format{ } \ use_filesystem{ } \ filesystem{ ext4 } \ mountpoint{ / } \ lv_name{ root_lv } \ . \ 64 512 300% linux-swap \ $defaultignore{ } \ $lvmok{ } \ method{ swap } \ format{ } \ lv_name{ swap_lv } \ . d-i partman-auto-raid/recipe string \ 1 2 0 lvm - \ /dev/sdb1#/dev/sdc1 \ . d-i mdadm/boot_degraded boolean true #d-i partman-md/confirm boolean true #d-i partman-partitioning/confirm_write_new_label boolean true #d-i partman/choose_partition select Finish partitioning and write changes to disk #d-i partman/confirm boolean true #d-i partman-md/confirm_nooverwrite boolean true #d-i partman/confirm_nooverwrite boolean true EDIT: After a bit of googling I found below snippet of code from partman-auto-lvm, but I still don't understand why would they prevent that setup if it's possible to do manually and booting from boot partition on LVM is possible. # Make sure a boot partition isn't marked as lvmok if echo "$scheme" | grep lvmok | grep -q "[[:space:]]/boot[[:space:]]"; then bail_out unusable_recipe fi

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• MacBook Pro 13" Install DVD Wont Start

  - by Belliez

  Hi, Excuse such a basic question... I am a Laptop Fixer and deal with Windows based laptops only but very recently took in a 13" MacBook Pro for a re-install of the OS (easy I thought!) I inserted the Install DVD, held the C button and turn on. I could hear the disk spinning up and after about a min the DVD is ejected. There are a few scratches on the DVD but should be ok as not that deep. However, Windows Vista was installed (it failed to install properly hence the re-install of Mac OS). Should I wipe clean and format the hard disk first? Could this be the reason the DVD is ejected? Any advice would be gratefully accepted? p.s. never held a MacBook Pro before... first impressions, wow... alu casing and massive touch pad... and the magnetic power socket.... so impressed and it doesn't even work!

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• Can compressing Program Files save space *and* give a significant boost to SSD performance?

  - by Christopher Galpin

  Considering solid-state disk space is still an expensive resource, compressing large folders has appeal. Thanks to VirtualStore, could Program Files be a case where it might even improve performance? Discovery In particular I have been reading: SSD and NTFS Compression Speed Increase? Does NTFS compression slow SSD/flash performance? Will somebody benchmark whole disk compression (HD,SSD) please? (may have to scroll up) The first link is particularly dreamy, but maybe head a little too far in the clouds. The third link has this sexy semi-log graph (logarithmic scale!). Quote (with notes): Using highly compressable data (IOmeter), you get at most a 30x performance increase [for reads], and at least a 49x performance DECREASE [for writes]. Assuming I interpreted and clarified that sentence correctly, this single user's benchmark has me incredibly interested. Although write performance tanks wretchedly, read performance still soars. It gave me an idea. Idea: VirtualStore It so happens that thanks to sanity saving security features introduced in Windows Vista, write access to certain folders such as Program Files is virtualized for non-administrator processes. Which means, in normal (non-elevated) usage, a program or game's attempt to write data to its install location in Program Files (which is perhaps a poor location) is redirected to %UserProfile%\AppData\Local\VirtualStore, somewhere entirely different. Thus, to my understanding, writes to Program Files should primarily only occur when installing an application. This makes compressing it not only a huge source of space gain, but also a potential candidate for performance gain. Testing The beginning of this post has me a bit timid, it suggests benchmarking NTFS compression on a whole drive is difficult because turning it off "doesn't decompress the objects". However it seems to me the compact command is perfectly capable of doing so for both drives and individual folders. Could it be only marking them for decompression the next time the OS reads from them? I need to find the answer before I begin my own testing.

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• cPanel web servers mounting home partition to a NAS or SAN

  - by Scott

  Hello, I currently have 2 cPanel web servers that are little 1RU dual cpu quad core xeons. They have a lot of resources for processing and handling web requests, and never exceed more than 10% cpu usage. They also have plenty of RAM. The problem is though that they both have RAID 1 160Gb SAS hard disk drives in them that are 75% full, and growing by the day. I didnt think that the amount of disk usage would be so high, but due to the nature of the sites hosted, this has become an issue. The easy fix would be just to upgrade the hard drives to something bigger (probably not of the SAS variety), but I am thinking of keeping the current machines as "processing servers" and buying a central "storage server" with about 12TB of storage. The /home/ partition on each of the 1RU servers would be mounted to a NAS or SAN point on this central storage server. My questions are: - Has anyone got a cPanel setup where they mount /home/ to a NAS or SAN elsewhere? If so, can you provide details as to what you did and how it went :) - Any recommendations on networking? Is gigabit ethernet enough? Is TCP/IP going to be a noticable performance problem? Anyone used a TOE key? - Anyone benchmarked or had any performance issues with SAN over NAS? Any help greatly appreciated. Scott

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• fsck on LVM snapshots

  - by Alpha01

  I'm trying to do some file system checks using LVM snapshots of our Logical Volumes to see if any of them have dirty file systems. The problem that I have is that our LVM only has one Volume Group with no available space. I was able to do fsck's on some of the logical volumes using a loopback file system. However my question is, is it possible to create a 200GB loopback file system, and saved it on the same partition/logical volume that I'll be taking a snapshot of? Is LVM smart enough to not take a snapshot copy of the actual snapshot? [root@server z]# vgdisplay --- Volume group --- VG Name Web2-Vol System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 29 VG Access read/write VG Status resizable MAX LV 0 Cur LV 6 Open LV 6 Max PV 0 Cur PV 1 Act PV 1 VG Size 544.73 GB PE Size 4.00 MB Total PE 139450 Alloc PE / Size 139450 / 544.73 GB Free PE / Size 0 / 0 VG UUID BrVwNz-h1IO-ZETA-MeIf-1yq7-fHpn-fwMTcV [root@server z]# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda2 9.7G 3.6G 5.6G 40% / /dev/sda1 251M 29M 210M 12% /boot /dev/mapper/Web2--Vol-var 12G 1.1G 11G 10% /var /dev/mapper/Web2--Vol-var--spool 12G 184M 12G 2% /var/spool /dev/mapper/Web2--Vol-var--lib--mysql 30G 15G 14G 52% /var/lib/mysql /dev/mapper/Web2--Vol-usr 13G 3.3G 8.9G 27% /usr /dev/mapper/Web2--Vol-z 468G 197G 267G 43% /z /dev/mapper/Web2--Vol-tmp 3.0G 76M 2.8G 3% /tmp tmpfs 7.9G 92K 7.9G 1% /dev/shm The logical volume in question is /dev/mapper/Web2--Vol-z. I'm afraid if I created the loopback file system in /dev/mapper/Web2--Vol-z and take a snapshot of it, the disk size will be trippled in size, thus running out of disk space available.

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