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• Recommendations for USB flash drive fast at writing small files

  - by Andrew Bainbridge

  I want a drive that I can be used as my work drive, storing a Subversion repo and sandbox for a small project. I'd also like it to be able to store a DVD rip. At the moment I've got a Super Talent pico-C 8gb. It's fast at reading and writing DVD rips, but the performance on small files (ie less than 4k) is utterly terrible (we're talking floppy disk speeds here). This Ars review measured a similar Super Talent drive and pretty much confirmed my measurements (take a look at the random write speeds on page 5). So, I'm looking for a 8gb or bigger drive that doesn't suck at read and write of small files and still has acceptable performance for very large files.

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• Need to get a file written to a floppy.

  - by dboarman-FissureStudios

  I asked this question over on SO. I have tried dd if=kernel.sys of=/dev/fd0 bs=512 seek=1 to get this file to write to the floppy. It is a kernel shell that must be written to the sector immediately following the bootsector of a disk to boot the PC. No matter what I've tried, for some reason, kernel.sys is not writing to the floppy. I know the bootstrap loader is being written and executed. However, it cannot find the kernel to load the shell. Any ideas on what I am doing wrong? I mean, really, how is it so difficult to get this file written to a floppy? OpenSUSE 11.2

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• Database checksum features - redundant? useful?

  - by Eloff

  Just about every mainstream DB has a feature to calculate checksums per page, per sector, or per record. Now for a DB that does full recover after any crash, like PostgreSQL, is a checksum even useful? There will be no data loss as long as the xlog is ok, no matter what kind of corruption happened to the data itself, as the redo log is replayed every committed transaction will be restored. So checksums are useless on restore. Doesn't the filesystem or disk keep checksums anyway to detect corruption? So unless the checksum is per record, all it does is tell you there is corruption - which the OS should be yelling at you the minute you try to read it - so useless in operation? I can't imagine how a checksum can be helpful in any sane database - but since they all use them - I'd say that's just failure of imagination on my part. So how is it useful?

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• Optimising bare-metal hypervisor installation

  - by Stephen

  what is the best way to install a bare metal hypervisor (i.e. to host multiple VM's)? I spoke to a friend and he is using a HP server to host all his VMs with VMware ESXi, but he installed the VMWARE esxi software on a flash card. He can then use his full hard disk capacity from each drive for the VMs. Is this a pretty standard setup when configuring a bare-metal hypervisor? How do you guys do it, and what is best?

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• How to rotate log files when running pyapns and twistd

  - by Henrik

  I use pyapns (Iphone push server) which in turn uses twisted (twistd daemon). twistd daemon produces twistd.log files. It rotates them to twistd.log.1, twistd.log.2 and so on when twistd.log reaches 1MB but it doesn't use logrotate so I guess it's built in. The problem is that this continues forever and that old log files are never deleted. This eventually fills my disk. I've tried to use logrotate or similar to rotate the logs, but then I would need to run logrotate very very often since I need to rotate BEFORE twistd.log reaches 1MB. This could happen within a second for all I know depending on how much log is produced. So how could I logrotate without hacking pyapns/twistd scripts?

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• PERC 5/i Enable alarm on disks failures

  - by Andy M

  I'm trying to enable one the alarm of my server's raid controller PERC 5/i. Using this documentation, under the chapter Audible Alarm Warnings, it's explained that enabling an audible alarm is allowed in order to quickly spot failures on my hard disks. My trouble is that when entering the disk controller configuration (Ctrl+R at boot time), I'm able to set up lot of things but I cannot navigate to Enable Audible Alarm. I have : Enable Controller BIOS Enable Alarm Enable BIOS stop on Error I can navigate with my arrow keys to both the first and third items, but I cannot navigate to or select the second! It's not greyed out, and seems like I should be able to select go on this entry, but my cursor keep skipping it. Any ideas about what I'm missing here?

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• How to get Windows Server 2008 VM to use multiple cores

  - by David Fraser

  I have a Windows Server 2008 machine running in VirtualBox. On initial installation, only one processor was made available, but now I want to run it as a multiprocessor machine. I have made all four cores available in the VirtualBox settings (as well as enabling VT-x/AMD-V and Nested Paging), but Task Manager still only shows one CPU. However, the four CPU cores are visible in Device Manager under Processors. In the event log on startup, I can see the following relevant events: EventLog.6009 Microsoft (R) Windows (R) 6.00.6002 Service Pack 2 Multiprocessor Free Kernel-Processor-Power.4 Processor 0 exposes the following: 1 idle state(s), 0 performance state(s), 0 throttle state(s) Kernel-Processor-Power.4 Processor 255 exposes the following: 0 idle state(s), 0 performance state(s), 0 throttle state(s) Kernel-Processor-Power.4 Processor 255 exposes the following: 0 idle state(s), 0 performance state(s), 0 throttle state(s) Kernel-Processor-Power.4 Processor 255 exposes the following: 0 idle state(s), 0 performance state(s), 0 throttle state(s) How can I make this system actually boot up as a multiprocessor machine?

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• Ubuntu server very slow out of the blue sky (Rails, passenger, nginx)

  - by snitko

  I run Ubuntu server 8.04 on Linode with multiple Rails apps under Passenger + nginx. Today I've noticed it takes quite a lot of time to load a page (5-10 secs). And it's not only websites, ssh seems to be affected too. Having no clue why this may be happening, I started to check different things. I checked how the log files are rotated, I checked if there's enough free disk space and memory. I also checked IO rate, here's the output: $ iostat avg-cpu: %user %nice %system %iowait %steal %idle 0.17 0.00 0.02 0.57 0.16 99.07 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn xvda 2.25 39.50 16.08 147042 59856 xvdb 0.00 0.05 0.00 192 0 xvdc 2.20 25.93 24.93 96530 92808 xvdd 0.01 0.12 0.00 434 16 xvde 0.04 0.23 0.35 858 1304 xvdf 0.37 0.31 4.12 1162 15352 Rebooting didn't help either. Any ideas where should I be looking?

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• what might cause a print error in perl?

  - by Mark J Seger

  I have a long running script that every hour opens a file, prints to it and closes the file. I've recently found very rarely, the print is failing, not because I'm testing the status of the print itself but rather due to the fact of missing entries in the file until the system is actually rebooted! I do trap for file open failures and write a message to syslog when that happens and I'm not seeing any open failures so I'm now guessing it may be the print that is failing. I'm not trapping the print failures, which I suspect most people don't but am now going to update that one print. Meanwhile, my question is does anyone know what types of situations could cause a print statement to fail when there is plenty of disk storage and no contention for a file which has been successfully opened in append mode?

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• Monitor sleep in Windows XP does not work. Is there an add on to force it?

  - by bert

  I have an EEE box with XP Home and a DVI connected TFT, and it does not sleep the monitor. It only starts working after I go to the energy control panel and turn it off and on again. Then the timed sleep works for the current session of computer use. After a shut down and boot next day, sleep does not work again (it is still set in the preferences however). What can hold the sleep function from working? Are there issues with Skype or MSN? Is there a utility to be less critic to processes interrupting sleep and offer a more reliable monitor sleep function for XP?

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• Navigation keys on numeric keypad randomly stop working

  - by Tom Hughes

  Shortly after a restart, the arrow and navigation (Home, End...) keys on my numeric keypad will randomly stop working, and -- regardless of the state of the NumLock -- return only numbers. I notice this the most in browser applications (like this edit box) but the same effect is true on the command line and in desktop applications like Word. I swapped keyboards and now use a Microsoft keyboard (both are USB keyboards) but the same behavior persists. I also tried a clean boot to clean out startup programs but this made no difference. The separate arrow keys and navigation keys between the QWERTY keys and the numeric keypad work fine, but my strong preference (dating back to DOS and MS Flight Simulator) is to use the navigation keys in the numeric keypad.

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• Clonezilla-SE with another DHCP Server in LAN

  - by aleroot

  I want to install Clonezilla-Server(192.168.1.100) in a network that already have a DHCP Server (dd-wrt with dnsmasq - 192.168.1.1). I've installed Clonezilla-SE on ubuntu Server 10.10, once installed and configured Clonezilla Server i've removed the DHCP-Server and set pxe server address in dnsmasq configuration on DHCP Server : dhcp-boot=pxelinux.0,,192.168.1.100 When i try to start from PXE a Computer in the network clonezilla start, but give me an error that the ipddress of the machine is not given by the clonezilla server and can't continue ... Someone has already tried to configure Clonezilla-SE in a similar enviroment? Is there some configuration on DRBL server of Clonezilla that i need to do ?

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• Stop RAID 5 from Initializing

  - by Antz

  Hi, I am trying to follow Ictinike's guide on Recovering Intel RAID "Non-Member Disk" Error found here, Ictinike's RAID recovery Guide I have recreated my RAID array as per the instructions. However my RAID array status is then automatically set to: INITIALIZE When I boot back into my Windows XP desktop, the Intel Matrix Storage Utility begins to "Initialize" my drives. This is a long slow process that will take about 20 hours. I suspect all my data will be lost. I have gone back into my bios and disabled my RAID controller to prevent any further initialization and data loss. I have read that initialization will cause data loss. I've also read somewhere that it won't. I am not so confident in the latter. Is there anyway to stop this initialization process so I can continue to follow the steps in the recovery guide? Some system specs: ABIT IP35 Pro Motherboard ICH9R on board RAID controller

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• Can KVM CPU assignment count differ from physical hosts CPU count?

  - by javano

  I have read this question. I knew already that I could for example, have a quad core machine with four guests each having two vCPUs. As they don't all be require 100% CPU usage all the time, the scheduler would handle this for me. My question is about how this relates to a fail-over or migration situation; If host1 has two dual-core CPUs, and I assign guest1 four vCPUs (so it accessed all four physical cores), what will happen if I try and migrate it to host2 which only has one dual-core CPU? Can qemu-kvm emulate more vCPUs than there are physical? Or would I have to shut down the virtual machine, change the CPU assignment, migrate it, and then boot it back up (so no live migration)? Many thanks.

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• Reboot VPS by reaching memory limit

  - by Ali

  When a server uses memory more than available RAM, the system will shut down the virtual machine. Then, it is only possible to boot from outside (VPS control panel, e.g. vePortal or SolusVM). However, it should be possible to plan a reboot before possible shut down. What is the best practical method to check the used memory, and reboot the system upon reaching e.g. 90% of the allowed RAM? Is there a common program or script to do so? I am using Debian/Ubuntu.

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• is it worth defragging an iPod

  - by alimack

  Essentially my 5G iPod was cutting tracks off and generally misbehaving. So I did the following: 1) Use Diskwarrior - heavy directory fragmentation which it fixed; 2) Use iDefrag - some fragmentation but it kept halting as it couldn't move files; 3) Try to write out drive with Disk Utility - got a warning from DU so gave up before I started; 4) Completely restored using iTunes; 5) Reran Diskwarrior - still heavy directory fragmentation; 6) Reran iDefrag, still fragmentation although limited to two bands; The iPod is much quicker to traverse menus and no more track skipping. My question is this - is defragging worth it or does the heat generated by the process kill the drive and make it a self-defeating process. Anyone have any metrics/ figures? Clearly it's a bad idea for solid state drives like the nano & touch.

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• Virtual PC - Display Issue with Ubuntu Server

  - by Christopher R

  Hi Everyone, I just did a clean install of Ubuntu Server 9.04 in Virtual PC on the Windows 7 RC, and it seems to be having a bit of an issue with the virtual machine's display adapter. I've tried setting a VGA flag in the GRUB configuration to no avail. This is a guess, but I think it has something to do with the color console mode that gets enabled by default at boot time. The system starts booting just fine (i.e. the console looks "normal" when I'm asked to enter an LVM passphrase, etc.), but then the display goes wonky after a few seconds and I end up with this. Typing commands in bash works just fine: it's not like the system is frozen or anything, I just can't see anything that I type. The console looks exactly the way it does in the image below.

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• Notebook fan spinning at max after trying Linux

  - by Igor Kulman

  I have a Thinkpad T420 (4178-BSG) I use with Windows. The fan (cpu) was always very quiet and I was completely satisfied with it. A few days ago I booted Backtrack Linux from a flashdrive and the fan started to spin at maximum and was very loud. The problem is that this state persists. When I start the Thinkpad and boot Windows as usual the fan start spining at max and never stops. It drives me mad. It looks like somehow the Linux change some settings and I have to suffer. I tried reseting BIOS, updating BIOS, nothing helpes. I even removed the keyboard, looked at the fan but there is no dust.

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• The bcdedit export operation fails. windows vista not booting.

  - by ocurro

  I'm fixing my boot record with bootrec.exe, the first command goes: C:\>bcdedit /export c:\BCD_Backup Immediately I receive this error here: The store export operation has failed. The requested system device cannot be found. Likewise, the next command fails, because bcd file is missing: C:\>attrib bcd -s -h -r Lastly, when trying the next command, all it returns is "The requested system device cannot be found". C:\>bootrec /RebuildBcd I'm using Windows 7 setup image to operate. Have Vista installed atm. Has it happened to you? I'd appreciate some orientation.

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• Sub-process /usr/bin/dpkg returned an error code (1)

  - by rohit

  Hey friends i am getting the following error when i am trying to purge shorewall root@aptosid:/etc# apt-get purge shorewall Reading package lists... Done Building dependency tree Reading state information... Done The following packages will be REMOVED: shorewall* 0 upgraded, 0 newly installed, 1 to remove and 3 not upgraded. 1 not fully installed or removed. After this operation, 1,843 kB disk space will be freed. Do you want to continue [Y/n]? (Reading database ... 212702 files and directories currently installed.) Removing shorewall ... : not found/shorewall: 25: /etc/default/shorewall: :q Stopping "Shorewall firewall": not done (check /var/log/shorewall-init.log). invoke-rc.d: initscript shorewall, action "stop" failed. dpkg: error processing shorewall (--purge): subprocess installed pre-removal script returned error exit status 1 configured to not write apport reports Errors were encountered while processing: shorewall E: Sub-process /usr/bin/dpkg returned an error code (1) root@aptosid:/etc# please help me out ...........?

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• CISCO 2911 Router configuration

  - by bala

  Device cisco 2911 router configuration support is required please. I have exchange server 2010 configured and working without any errors the problem is in cisco router configuration when exchange server sends emails out the receives WAN IP not the public ip. I have configured RDNS lookups with our MX record IP addesses that match the FQDN but all our emails are rejected because it does not match with the public ip. Receiving mails problem is not an problem all mails are coming through. i am sure i am missing something on the router configuration that does not sends the public ip, can any one help me to solve this issue. Note; I've got 1 WAN IP & 8 Public IP from ISP . Find below the running configuration. Building configuration... Current configuration : 2734 bytes ! ! Last configuration change at 06:32:13 UTC Tue Apr 3 2012 ! NVRAM config last updated at 06:32:14 UTC Tue Apr 3 2012 ! NVRAM config last updated at 06:32:14 UTC Tue Apr 3 2012 version 15.1 service timestamps debug datetime msec service timestamps log datetime msec service password-encryption ! hostname BSBG-LL ! boot-start-marker boot-end-marker ! ! enable secret 5 $x$xHrxxxxx5ox0 enable password 7 xx23xx5FxxE1xx044 ! no aaa new-model ! no ipv6 cef ip source-route ip cef ! ! ! ! ! ip flow-cache timeout active 1 ip domain name yourdomain.com ip name-server 213.42.20.20 ip name-server 195.229.241.222 multilink bundle-name authenticated ! ! crypto pki token default removal timeout 0 ! ! license udi pid CISCO2911/K9 ! ! username bsbg ! ! ! ! ! ! interface Embedded-Service-Engine0/0 no ip address shutdown ! interface GigabitEthernet0/0 ip address 192.168.0.9 255.255.255.0 ip flow ingress ip nat inside ip virtual-reassembly in duplex auto speed 100 no cdp enable ! interface GigabitEthernet0/1 ip address 213.42.xx.x2 255.255.255.252 ip nat outside ip virtual-reassembly in duplex auto speed auto no cdp enable ! interface GigabitEthernet0/2 no ip address shutdown duplex auto speed auto ! ip forward-protocol nd ! no ip http server no ip http secure-server ! ip nat inside source list 120 interface GigabitEthernet0/1 overload ip nat inside source static tcp 192.168.0.4 25 94.56.89.100 25 extendable ip nat inside source static tcp 192.168.0.4 53 94.56.89.100 53 extendable ip nat inside source static udp 192.168.0.4 53 94.56.89.100 53 extendable ip nat inside source static tcp 192.168.0.4 110 94.56.89.100 110 extendable ip nat inside source static tcp 192.168.0.4 443 94.56.89.100 443 extendable ip nat inside source static tcp 192.168.0.4 587 94.56.89.100 587 extendable ip nat inside source static tcp 192.168.0.4 995 94.56.89.100 995 extendable ip nat inside source static tcp 192.168.0.4 3389 94.56.89.100 3389 extendable ip nat inside source static tcp 192.168.0.4 443 94.56.89.101 443 extendable ip nat inside source static tcp 192.168.0.12 80 94.56.89.102 80 extendable ip nat inside source static tcp 192.168.0.12 443 94.56.89.102 443 extendable ip nat inside source static tcp 192.168.0.12 3389 94.56.89.102 3389 extendable ip route 0.0.0.0 0.0.0.0 213.42.69.41 ! access-list 120 permit ip 192.168.0.0 0.0.0.255 any ! ! ! control-plane ! ! ! line con 0 exec-timeout 5 0 line aux 0 line 2 no activation-character no exec transport preferred none transport input all transport output pad telnet rlogin lapb-ta mop udptn v120 ssh stopbits 1 line vty 0 4 password 7 xx64xxD530D26086Dxx login transport input all ! scheduler allocate 20000 1000 end

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• Saving music wisely: Why save 'Queen - Bohemian Rhapsody.mp3' millions of times?

  - by hsmit

  As far as I'm concerned, Queen's song 'bohemian rhapsody' is one of the most popular songs all time. But for the purpose of this message you may replace this with another track. At the same time I think 60% of the digital-music listeners have this track. Sometimes we have multiple copies: different versions of the track, different devices, unwanted duplicates in download folders, itunes folders etc.. Wouldn't it be much smarter to store these songs only once? You can imagine various solutions for this. How would you accomplish this? Some criteria that may help you find an answer: It must reduce disk space It must remember which music belongs to you (DRM) It must use network traffic efficiently

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• Dell V105 and 10.6

  - by James

  Hello, I am trying to get a Dell V105 printer to work with my iMac. It is running 10.6 and I have installed all the drivers on the Snow Leopard disk. I believe there is no official Dell driver but I have also heard the Dell printers are made by third parties that may sell the same printer under different names. There a quite a few Lexmark models that seem to look very similar and I have tried setting the driver to the 2600 series that looks very similar but that has not enabled me to print. Although it claims to give me the supply levels correctly. Can anyone help? Thanks for your time

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• What is good book for administration & configuration of Storage logical arrays?

  - by unknown (yahoo)

  I am looking for a book which can explain pros and cons of different combination of configurations/policies of storage Arrays and may also suggest some best practices for certain scenarios for e.g. when data availability & security is very important. There are a lot of "books for dummy" but they don't go in depth, I am a more of developer so I would like to understand how and why exactly it works beneath policies & configuration settings. I am working with EMC clarion logical array but I will have to work with EMC Symmetrix or NetApp or any other types of disk arrays.

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• /tmp/ read-only

  - by Chirag

  When I'm trying delete some of the old eaccelerator files it gives me following errors rm: cannot remove `/tmp/eaccelerator/7/2/eaccelerator-0502.02065984': Read-only file system What can I do it fix it? Filesystem Size Used Avail Use% Mounted on /dev/sda2 226G 127G 88G 60% / /dev/sdc1 227G 102G 114G 48% /disk1 /dev/sda1 99M 18M 77M 19% /boot tmpfs 4.0G 0 4.0G 0% /dev/shm /dev/sdb1 459G 182G 255G 42% /home4 /usr/tmpDSK 485M 325M 135M 71% /tmp That's my output from the server. Also what commands can I use to unmount and mount it? And should I do it while my web server is running?

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