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• How do I find the cause for a huge difference in performance between two identical Ubuntu servers?

  - by the.duckman

  I am running two Dell R410 servers in the same rack of a data center. Both have the same hardware configuration, run Ubuntu 10.4, have the same packages installed and run the same Java web servers. No other load. One of them is 20-30% faster than the other, very consistently. I used dstat to figure out, if there are more context switches, IO, swapping or anything, but I see no reason for the difference. With the same workload, (no swapping, virtually no IO), the cpu usage and load is higher on one server. So the difference appears to be mainly CPU bound, but while a simple cpu benchmark using sysbench (with all other load turned off) did yield a difference, it was only 6%. So maybe it is not only CPU but also memory performance. I tried to figure out if the BIOS settings differ in some parameter, did a dump using dmidecode, but that yielded no difference. I compared /proc/cpuinfo, no difference. I compared the output of cpufreq-info, no difference. I am lost. What can I do, to figure out, what is going on?

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• Can not boot windows XP from cloned hard disk - what can I do?

  - by Martin

  My configuration: a PC (some years old) with MSI K8N-Neo-4F Motherboard, 1 GB RAM. Disk 1 (Maxtor, SATA II, 250 GB): 2 Partitions, on Partition 1 (48 GB): Windows XP Professional (NTFS) on Partition 2 (190 GB): data (NTFS) I wanted to have a larger and faster disk (the PC is incredibly slow and permanently the disk is rattling when I try to open an application or during Windows startup), so I took Disk 2 (Seagate, Sata II, 500 GB), installed in the PC, created at first a 400 GB-partition at the end of the disk and cloned the data to it, which worked well Installed a swap partition and a partition for Ubuntu Linux 12.10 on the first "part" of the disk so I was able to boot Linux and the old Windows XP with the Linux "System selection" at startup. Now I wanted to move Windows XP to the new disk, deleted the Linux partitions cloned Windows XP to the new disk (with free tools - EASESUS), left both disks in the PC and tried to select the new hard drive during boot as boot partition. This did not work, the PC refused to boot from this second disk. I tried many things like making the boot partition on the 2nd drive "active" in the Windows System Preferences modifying the boot.ini file to boot from the second disk - tried to boot from it, but ended with an error message stating that it was not possible to boot from this disk because of a hardware failure or something else or so removing the original disk and plugging the new one on the same SATA port as the original one - also booting failed with an error message repairing the MBR by booting into recovery mode from the Windows XP Installation CD-ROM, selecting the second disk and doing "FIXMBR" which said that everything was fine with the MBR. after that at least the PC tried to boot from the newer disk and then startup was hanging during the blue screen with the Windows Logo.... no luck. ... deleting the cloned partition and cloning again - this time with Macrium Reflect Free version... - no success during booting. I tried a lot of things with no success, so I wonder what I am doing wrong?! What could I do to successfully clone my Win XP partition to replace the original disk by a larger one which is bootable.

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• Enter network credentials as part of batch script

  - by Michael

  WinXP: I have several system services that are needed to run some machinery in my lab. The machine these services are running uses a lab login that has administrator rights. Our IS department, unfortunately, has it set up where at some point during the night the login "loses" the privilege level to start/stop these services. The account stays logged in, but the software controlling my hardware becomes unresponsive. In order to get things back up and running, I have to stop the system services and restart them. Because of the security settings, however, I have to re-enter the user password to start the service (even though the user was never logged out). That, I get the "This service cannot be started due to a logon failure" and I have to enter the password. What would be ideal is to have a batch script run before anyone gets into work that stops all of the necessary services, enters the user credentials when prompted, and then restarts them so that everything is ready for first shift to run. I assumed that using the Task Scheduler in Windows would work as it allows you to run batch files with a user's name and password, but this didn't seem to do the trick. With this setup I would arrive to find that all the services are stopped but not started again. (Presumably because the authentication failed.) The batch file is about as simple as it gets, all I have is: net stop "Service1" net stop "Serivce2" etc., then restart in reverse order based on dependency: net start "Service2" net start "Serivce1" What would it take to accomplish what I'm trying to do and restart the services?

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• Short, intermittent USB port timeouts

  - by jacobsee

  I have a data acquisition application controlled by a Windows PC. I am using an Intel Desktop Board DH67CL motherboard. This has 6 USB2 ports along with 2 of the new blue USB3 ports. The DAQ instrument connects via USB to the computer. Roughly once every day or two there is a short communication glitch with the USB that causes the instrument to disconnect briefly and then reconnect. This is logged so I know whenever it happens. Occasionally it will cause the data acquisition to stop. I've verified that the glitches will go away if I use the USB3 ports, or if I use a PCI add-on card with USB ports. So it seems that there is something going on with these built-in USB2 ports on this motherboard. I haven't yet had a chance to test with other motherboards. My question: what could be causing these glitches and how to get rid of them for this board, or is there a better motherboard to use? We have standardized on the DH67CL because it's inexpensive, has 3 PCI slots that we need, and is readily available. We don't need the power of higher-end server boards but reliability is important. Thanks. Update: This problem has been reproduced many times on different hardware, though we always use the same model of motherboard (DH67CL) and power supply (Antec EA-430D). I don't think the power requirements are very high but will check on that.

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• Windows 8 using as a webserver

  - by Jason

  I have a few hobby websites that I currently host on CentOS 6. Apache, mail serving, PHP, MySQL nothing special. In the past I used Windows XP to do this same task, for years, and I was OK. I switched to Linux and for the last few years it has been such a pain. updates break, certain apps only support certain distros without compiling from source. It prevents me from working on my hobby sites more because I am always fixing something. With Windows I locked it down, I run a hardware firewall and packet analyser, kept up on updates and A/V and never had a problem. I dont allow RDC from outside the local LAN, no FTP open, run OpenSSH on an obscure port.. I am considering switching to Windows 8 (since it is a cheaper license now that Windows 7) and running apache, HMailServer, PHP, MySQL, just like my CentOS install. My questions: I am not familiar with Windows 8, can the above be done like XP? No new security restrictions or the OS preventing this from happening? The machine is a Athlon 64-bit X2 with 32GB of RAM. Will Windows 8 see all of the RAM? Technically the machine came with Windows 7, and there is a serial number on it but I am sure I wiped away the Windows 7 recovery partition when I switched to Linux....

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• Windows Server 2012 Can't Print

  - by Chris

  I know this may sound incredibly stupid and there is probably an easy solution but I can't seem to find it. Friends of mine recently upgraded their server for their small business from the POS old one. New hardware and a change from Windows Server 2003 to Windows Server 2012. I've got everything they need transfered over and running except for printing. They need to be able to print to printers in the vans their technicians use from the server via remote desktop. In other words the use a laptop to remote desktop into the server and need to print invoices out from the remote server to printers attached locally via usb. On the old server they just installed the identical driver and that was it, they could print as needed. On this server no matter what we seem to do we can't get it to print remotely, and in the process we also discovered that the server can't even print to the network printer. It sees the printer on it's network and it sees (through redirect) the printers in the vans but when you hit print it claims it did and nothing happens. There isn't an issue with the printers themselves as every other device we have can print to them without issues. Is there some setting that is inhibiting the server from printing? Is there something I need to install (print server?) to add the functionality? Thanks in advance for helping me out here

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• Is there any way to tweak / rotate mouse orientation? Any applications? Registry edits?

  - by calbar

  I've got a very frustrating issue with my new Logitech Marathon Mouse M705. It is absolutely perfect for what I need, with the exception that it tracks on an angle for some reason. What I mean is when you slide the cursor to the left, it trends upward - when you slide to the right, it trends down. Moving the cursor along a flat horizontal line is no longer a natural motion - you need to fight what I suspect is a mechanical error of some kind. Unfortunately, I've already exchanged this mouse once and tested both on different Windows 7 and Mac OS X machines - the problem continues to occur. Is there a software solution for me? I'm incredibly surprised there is no simple way to adjust the orientation... how can every mouse manufacturer possibly adjust their hardware to track to everyone's tastes? What about those who need to flip orientation a full 90 or 180 degrees? I only need to adjust mine a few degrees, but I'm sure that need has arisen as well. Anyway, I'm running the latest SetPoint drivers (6.00) on Windows 7 and there are no orientation options available. I've checked out uberOptions and the M705 isn't supported yet (with the last version update over 6 months ago). MAF Mouse instructions are a very strange series of mouse clicks to activate. This app also seems a little overkill and costs $$ (which I'm willing to pay as a last resort). Is there no universal registry value for mouse orientation? How about for SetPoint drivers specifically? I've done a simple search in regedit without any luck. An XML file somewhere? Anything?

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• SQL Server Subscriber Migration

  - by SuperCoolMoss

  We're currently have one way transaction replication from a SQL Server 2005 OLTP publisher/distrbituor to two subscribers (one SQL 2005 and the other SQL2008 R2). Replication security is via the SQL Agents' domain service account (the same account is used on all boxes). The SQL2008R2 subscriber is used for BI purposes and hosts a database that has a subset of the Production publisher database tables, with different security and indexes. We need to migrate this BI subscriber to a newer box with more performant hardware. The plan is as follows: Stop replicating to the BI box (continue replicating to the other subscriber). Backup all databases on the BI box (including system databases). Restore all databases (including master in single user mode) to the new BI box (this has SQL Server 2008R2 already installed). Take the old BI box off the network and shut it down. Rename and Re-IP the new BI box to be the same as the old box. Switch replication back on. Are there any flaws in this approach?

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• How to monitor bandwidth use of each device on wifi network

  - by GWLlosa

  I have in my home a standard Comcast cable internet connection. I have it going from the wall to a cable modem, and from the modem to a late-series Linksys router, which provides wired and wireless networking. The vast majority of the users are wireless connections. For day-to-day tasks, this connection is fully sufficient for all my needs. However, on regular occassions, we have social gatherings that involve many people bringing laptops and other PCs and using the network and internet simultaneously, frequently for gaming. I have no administrative oversight over these machines; they have been known to be riddled with spyware and/or bloatware or be running torrents, legal or otherwise. The only reason I care is that on a regular basis, one of the machines will flatline my internet bandwith, and consume it all in order to upload/download/spam people/whatever. When this happens, the latency of the connections for gaming and the like becomes unacceptable, and everyone suffers. My question is: Is there a system I can set up whereby I can easily monitor the various systems connected to my wireless connection, see how much bandwith each one is using, and for what ends? That way, at a glance, I can spot the offending machine and kick it from the connection, without having to go from machine to machine, checking each one's "bandwith used" properties manually, and dealing with the owner's indignant protests all the while. I understand this will likely involve 3rd-party software and/or hardware; my issue is I don't even know where to begin.

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• Adjust output Brightness/Gamma/Colors in Gnome

  - by Mikee

  We have a desktop system running Ubuntu 8.04.4, and it is connected to a standard desktop LCD monitor. Unfortunately, in 8.04.4, the brightness of the image is cranked way up. It appears to be a graphics driver issue. Unfortunately, installing a newer GPU driver for this Intel GPU is very difficult to do. So, I am looking for a software (or config file?) solution to achieve this. Note: Ubuntu 9.10 and higher do not exhibit this issue, so this is not a hardware problem. Note: VNC-ing to this machine from another does not exhibit this issue either. Also, I installed "DisplayCalibrator.app", and it does not work very well (the app comes up, but the contents of the window are blank). Is there anything that I can add to the xorg.conf file to correct this issue? Also, this solution: http://superuser.com/questions/96539/adjust-contrast-and-brightness-in-ubuntu did not resove my issue. Thank you all for the help!

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• Automatic o/s reset on a dedicated internet browsing Windows 7 pc.

  - by camelCase

  I have just purchased a new Acer Revo nettop PC for dedicated internet browsing. It will be the only pc on a home network. My original plan was to install one virtual PC for family browsing, another for remote web based server administration and ban browser use from the host Windows 7 o/s. The idea was that I could recover to a fresh VHD image once a week to eliminate any build up of malware inside the browser VMs. However now I am looking for alternative solutions since the Intel Atom cpu does not have hardware VT support which Windows Virtual PC requires. Would it be possible to engineer some type of routine overnight host o/s wipe and recovery? I guess cyber cafes do something like this? The only user data that would need to be retained across a recovery would be browser bookmarks but these could be exported to remote service. Edit 1: I am thinking the o/s reset could be done via some disk image recovery process. Edit 2: Just had a brainwave. Routine browsing could be done via the new Google Chrome O/S. I have just seen a video of the Google Chrome o/s booting off a usb pen drive in seconds.

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• Not able to access Silverlight.net and ONLY Silverlight.net - All other domains work!

  - by Sootah

  Alrighty folks, I have an extremely odd problem. I am able to surf the web fine with one odd (and really annoying at the moment) exception: Microsoft's Silverlight.net. Every other site that I go to works just fine. This is quite frustrating because I'm in the middle of programming a web app in Silverlight 4.0, and whenever I do a search for any code examples, tutorials, or whatnot at least 50% of the results are hosted in the silverlight.net forums. The error message that I get is: Oops! Google Chrome could not find www.silverlight.net It doesn't work in my other browsers either (both IE and FireFox). What's odd, is that while the error message would lead me to assume it's a DNS error, I can ping the URL just fine. C:\Users\The Doot>ping silverlight.net Reply from 206.72.125.201: bytes=32 time=106ms TTL=106 Reply from 206.72.125.201: bytes=32 time=106ms TTL=106 Reply from 206.72.125.201: bytes=32 time=106ms TTL=106 Reply from 206.72.125.201: bytes=32 time=106ms TTL=106 Ping statistics for 206.72.125.201: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 103ms, Maximum = 110ms, Average = 106ms I've checked my HOSTS file, and there's nothing that refers to ANY Microsoft URL in there. What could be causing this!?? More importantly, how do I fix it? Just for kicks, I've even included the results of a traceroute here for your enjoyment. OS: Windows 7 Ultimate Thanks in advance! -Sootah

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• Two screens hooked to one laptop

  - by mplacona

  Hi, I'm thinking of getting rid of my desktop, and using my (much better) laptop instead. I'm only wondering if I would be able to hook the two screens I have with it, so I'd end up with three screens. I've seen people doing it to desktops, but am not sure the same could be accomplished with a laptop. My laptop is a sony vaio, and it's got both a VGA output, and an HDMI output. It'd be great is I could simply hook two screens to it, and have three independent screens (not mirrored). on my desktop, I have pretty much the same thing, but with an extra DVI port. I connect the DVI to one screen, and the VGA to an older one. Trying to connect anything to the HDMI simply mirrors whatever is on the DVI (I've tried it a long time ago) So I was wondering if with the laptop I'd be able to do it, and end up with three independent screens. I don't know if there's anything else I could be using instead (i.e. any extra hardware), so recommendations are more than welcome. Thanks in advance, Marcos

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• Computer freezing while watching Flash videos from net

  - by t3st

  I have a Windows 7 home basic, while watching videos from net (within 5 minutes) computer starts to freeze and shows 100 percent CPU usage. I first thought it's a browser issue but watching videos from different browsers also has the same issue. My system runs the latest Firefox browser and all my plugins (including Flash) is up-to-date. After this when I shutdown/restart the computer it will go to the login window with out any problem. From there when I tried to log in to any account, the system starts to freeze and again I have to start and run Windows in safe mode (which doesn't show any problem). I read it in an article to do these steps CMD->sfc/scannow chkdsk after that only my system works normally, even now I can't watch any videos on the net otherwise it starts freezing( I can watch downloaded videos in computer without a problem) and have to do the whole process once more (which takes a lot of time). while running sfc/scannow its showed results that some of the files are corrupted and it could not be repaired. Can this be the cause for freezing of my computer while running Flash videos? or is it a hardware related problem? What different steps do I have to take to correct those corrupt files? System restore works only some times.

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• glusterfs mounts get unmounted when 1 of the 2 bricks goes offline

  - by Shiquemano

  I have an odd case where 1 of the 2 replicated glusterfs bricks will go offline and take all of the client mounts down with it. As I understand it, this should not be happening. It should fail over to the brick that is still online, but this hasn't been the case. I suspect that this is due to configuration issue. Here is a description of the system: 2 gluster servers on dedicated hardware (gfs0, gfs1) 8 client servers on vms (client1, client2, client3, ... , client8) Half of the client servers are mounted with gfs0 as the primary, and the other half are pointed at gfs1. Each of the clients are mounted with the following entry in /etc/fstab: /etc/glusterfs/datavol.vol /data glusterfs defaults 0 0 Here is the content of /etc/glusterfs/datavol.vol: volume datavol-client-0 type protocol/client option transport-type tcp option remote-subvolume /data/datavol option remote-host gfs0 end-volume volume datavol-client-1 type protocol/client option transport-type tcp option remote-subvolume /data/datavol option remote-host gfs1 end-volume volume datavol-replicate-0 type cluster/replicate subvolumes datavol-client-0 datavol-client-1 end-volume volume datavol-dht type cluster/distribute subvolumes datavol-replicate-0 end-volume volume datavol-write-behind type performance/write-behind subvolumes datavol-dht end-volume volume datavol-read-ahead type performance/read-ahead subvolumes datavol-write-behind end-volume volume datavol-io-cache type performance/io-cache subvolumes datavol-read-ahead end-volume volume datavol-quick-read type performance/quick-read subvolumes datavol-io-cache end-volume volume datavol-md-cache type performance/md-cache subvolumes datavol-quick-read end-volume volume datavol type debug/io-stats option count-fop-hits on option latency-measurement on subvolumes datavol-md-cache end-volume The config above is the latest attempt at making this behave properly. I have also tried the following entry in /etc/fstab: gfs0:/datavol /data glusterfs defaults,backupvolfile-server=gfs1 0 0 This was the entry for half of the clients, while the other half had: gfs1:/datavol /data glusterfs defaults,backupvolfile-server=gfs0 0 0 The results were exactly the same as the above configuration. Both configs connect everything just fine, they just don't fail over. Any help would be appreciated.

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• Two screens hooked to one laptop

  - by mplacona

  Hi, I'm thinking of getting rid of my desktop, and using my (much better) laptop instead. I'm only wondering if I would be able to hook the two screens I have with it, so I'd end up with three screens. I've seen people doing it to desktops, but am not sure the same could be accomplished with a laptop. My laptop is a sony vaio, and it's got both a VGA output, and an HDMI output. It'd be great is I could simply hook two screens to it, and have three independent screens (not mirrored). on my desktop, I have pretty much the same thing, but with an extra DVI port. I connect the DVI to one screen, and the VGA to an older one. Trying to connect anything to the HDMI simply mirrors whatever is on the DVI (I've tried it a long time ago) So I was wondering if with the laptop I'd be able to do it, and end up with three independent screens. I don't know if there's anything else I could be using instead (i.e. any extra hardware), so recommendations are more than welcome. Thanks in advance, Marcos

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• How do you recreate the System Recovery environment in Windows 7?

  - by Howiecamp

  I'm running Windows 7 Home Premium RTM (64-bit) and I want to take advantage of the system recovery tools (eg the Command Prompt) without using the Windows 7 DVD. My understanding is that this environment (WinRE) should be installed to your HDD by default as part of the Windows 7 installation. However, when I hit F8 on boot and select "Repair", I get: Windows failed to start. A recent hardware or software change might be the cause. To fix the problem... Status: 0xc000000e Info: The boot selection failed because a required device is inaccessible. The "Info" line seems like the smoking gun. My next step was to boot from the Windows 7 DVD, and choose "Repair". It indicated my Recovery Environment wasn't on the Windows 7 boot menu (perfect) and offered to fix it. I said yes and rebooted, however same issue as above. In addition, when I booted in to Windows 7 and I looked at the boot menu options, the recovery/repair option was not there. Only my Windows installation. Finally, I ran the Disk Management tool (diskmgmt.msc) and took a look at the contents of my "System Reserved" partition (which was set to "Active" as normal). It's unclear to me what the contents should look like, however it is my understanding that the WinRE environment gets installed to this partition. (As part of the above troubleshooting I followed http://superuser.com/questions/25728/how-to-fix-windows-7-boot-process which lead to http://www.sevenforums.com/tutorials/668-system-recovery-options.html).

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• clocksource tsc unstable

  - by amorfis

  Ok, now I have real server fault ;) After some time from booting (about one minute) my server hangs. All I can do is hard reset. Then after restart in /var/log/kern.log I can find: Jul 29 22:38:57 leonidas kernel: [ 90.729598] longhaul: Failed to set requested frequency! Jul 29 22:38:57 leonidas kernel: [ 90.731252] longhaul: Enabling "Ignore Revision ID" option. Jul 29 22:38:57 leonidas kernel: [ 91.201461] longhaul: Failed to set requested frequency! Jul 29 22:38:57 leonidas kernel: [ 91.201482] longhaul: Disabling ACPI C3 support. Jul 29 22:38:57 leonidas kernel: [ 91.204230] longhaul: Disabling "Ignore Revision ID" option. Jul 29 22:38:58 leonidas kernel: [ 91.416133] longhaul: Failed to set requested frequency! Jul 29 22:38:58 leonidas kernel: [ 91.416152] longhaul: Enabling "Ignore Revision ID" option. Jul 29 22:38:58 leonidas kernel: [ 91.960048] Clocksource tsc unstable (delta = -105611479 ns) I found some resources on the net, and it said to change clocksource, or disable ACPI. I tried disabling ACPI but it didn't help (but I noticed there was longer time before hanging). I can't change clock to hpet, because my system doesn't have such one. Output of cat /sys/devices/system/clocksource/clocksource0/available_clocksource: acpi_pm jiffies tsc My system is ubuntu server on VIA Epia hardware.

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• Azure Virtual Machines - what fault tolerance do they provide?

  - by Borek

  We are thinking about moving our virtual machines (Hyper-V VHDs) to Windows Azure but I haven't found much about what kind of fault tolerance that infrastructure provides. When I run VHD in Azure, I've got two questions: Is my VHD and all the data in it safe? I think that uploaded VHDs use the "Storage" infrastructure so they should be automatically replicated to multiple disks and geographically distributed but should I still make a full-image backup just to be safe? (Note that of course I will be backing up the actual data inside VMs that I care about; I just want to know if there is a chance greater than 0.0000001% that one day I will receive an email from Microsoft telling me that my VM is gone and that I should create or restore it from scratch). Do I need to worry about other things regarding the availability of my VMs? I mean, when I have an on-premise server I need to worry about the hardware itself, about the host operating system, what would happen if my router failed, if my Hyper-V's C: drive failed etc. Am I right in thinking that with Azure, their infrastructure takes care of all of this? Thanks.

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• HP/Lenovo alternative to Buffalo iSCSI TerraStation?

  - by Robin Day

  I'm looking at virtualising some of our infrastructure in order to allow for more resiliance and future expandability. We have successfully virtualised on single servers with Direct Attached Storage and are now looking for a more future proof solution using a high powered host (or two) and a SAN (or two). I'm thinking that the host machine will probably be an HP ProLiant DL360 G7 (all of our exisiting infrastructure is HP). Unfortunately, I am new to the world of SANs. From what I can see, the Buffalo Terrastation III is all I would need in order to setup an iSCSI SAN for VMWare to use. However, I'm a little reticent to go that way as it's a bit too "entry level" for my liking. In particular I would be very keen for more redundancy, power, networking, etc. I'm also very aware that you "get what you pay for". Therefore, can anyone reccommend equivalents from the big boys? HP/Lenovo? I have searched high and low on the HP site and seen many options but am struggling to work out if it is all the hardware I will need. Some options appear to need separate controllers from disk enclosures, etc.

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• Who should I run mysql as, on a personal computer?

  - by user664833

  I just installed mysql via homebrew (with brew install mysql, on Mac OS X Mountain Lion - recently installed from scratch). Following the installation, there is a "caveats" section with options around further necessary actions to take: ==> Caveats Set up databases to run AS YOUR USER ACCOUNT with: unset TMPDIR mysql_install_db --verbose --user=`whoami` --basedir="$(brew --prefix mysql)" --datadir=/usr/local/var/mysql --tmpdir=/tmp To set up base tables in another folder, or use a different user to run mysqld, view the help for mysqld_install_db: mysql_install_db --help and view the MySQL documentation: * http://dev.mysql.com/doc/refman/5.5/en/mysql-install-db.html * http://dev.mysql.com/doc/refman/5.5/en/default-privileges.html To run as, for instance, user "mysql", you may need to `sudo`: sudo mysql_install_db ...options... Start mysqld manually with: mysql.server start Note: if this fails, you probably forgot to run the first two steps up above A "/etc/my.cnf" from another install may interfere with a Homebrew-built server starting up correctly. To connect: mysql -uroot To launch on startup: * if this is your first install: mkdir -p ~/Library/LaunchAgents cp /usr/local/Cellar/mysql/5.5.27/homebrew.mxcl.mysql.plist ~/Library/LaunchAgents/ launchctl load -w ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist * if this is an upgrade and you already have the homebrew.mxcl.mysql.plist loaded: launchctl unload -w ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist cp /usr/local/Cellar/mysql/5.5.27/homebrew.mxcl.mysql.plist ~/Library/LaunchAgents/ launchctl load -w ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist You may also need to edit the plist to use the correct "UserName". On previous versions of Mac OS X I ran mysql as mysql user, but now I am confronted by the idea of running it as myself. I am the only one who uses this computer (which happens to be my laptop), and I do programming for work and for pleasure. What are the pros & cons, or best practices, around choosing whether to run mysql AS YOUR USER ACCOUNT or as mysql or something else still?

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• Offloading backups to secondary network

  - by user1467163

  I'm trying to solve a problem- Currently, we are constantly backing up and have no budget for additional servers. Our production network is still a 10/100 and handles voip, SQL plus our backup traffic, and I'd like to offload the backup traffic onto a secondary network- all of our servers have secondary NIC's that are not in use, and all support gigabit (Our switching hardware does not- a topic for another day). I'd like to move my backups off the production network, but I am having a hard time getting the computers to communicate. I am using a Netgear GS724T switch for the backup network- Chosen for cost and because I have used them extensively on networks saturated with ghosting traffic, so I know it's up to the task. I have defined a VLAN, with ports that are not members of any other VLAN. All traffic is untagged on the VLAN. I have set the servers with 192.168.1.10 and 192.168.1.11 addresses, 255.255.255.0 netmask and I have tried a blank GW, using the local IP of the server 192.168.1.whatever address, and I have tried using the switch's production-side IP as the GW. The machines cannot find each other. DNS addresses are blank because I am going purely by IP for now... Any ideas how to get these machines to talk? they are Windows machines, running Server 2008R2 and 2003R2. Thanks!

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• using i7 "gamer" cpu in a HPC cluster

  - by user1219721

  I'm running WRF weather model. That's a ram intensive, highly parallel application. I need to build a HPC cluster for that. I use 10GB infiniband interconnect. WRF doesn't depends of core count, but on memory bandwidth. That's why a core i7 3820 or 3930K performs better than high-grade xeons E5-2600 or E7 Seems like universities uses xeon E5-2670 for WRF. It costs about $1500. Spec2006 fp_rates WRF bench shows $580 i7 3930K performs the same with 1600MHz RAM. What's interesting is that i7 can handle up to 2400MHz ram, doing a great performance increase for WRF. Then it really outperforms the xeon. Power comsumption is a bit higher, but still less than 20€ a year. Even including additional part I'll need (PSU, infiniband, case), the i7 way is still 700 €/cpu cheaper than Xeon. So, is it ok to use "gamer" hardware in a HPC cluster ? or should I do it pro with xeon ? (This is not a critical application. I can handle downtime. I think I don't need ECC?)

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• Java: compile and run hanging at command prompt

  - by dwwilson66

  I'm having an issue that I'm hoping someone can help with. I'm working on netbook running WinXP Pro SP3, 1.6GHz & 1GB of RAM. I've got a relatively simple java program that I'm able to successfully compile and run on other computers (both XP and Win7), so I suspect my code is working fine--I've verified that all computers are running the same version of Java (build 1.7.0_02-b13). For about the past week, I get maybe three or four compiles and runs at the command prompt (running CMD from within WinXp) before I hang with a blinking cursor after keying my command and pressing enter. If I shut down the command prompt window and restart it, I can compile and run the program just fine--again, pointing to an OS/environment issue rather than code. The only system change I've made in the past week is to uninstall a Lexmark printer that I ditched a year ago, and removing/reinstalling Java. Oh, and an automatic Windows update... :\ I've used this netbook successfully for programming classes for the past year and a half. Anyone familiar with this issue and know of some system tweaks to solve it? I suspect that memory may not be getting cleaned up when the java program quits...only when CMD closes, but don't know any tools to troubleshoot. Ideas?

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• Disk Activity Alert Windows SBS 2003 on Dell PowerEdge 830 with Raid

  - by Ron Whites

  Background: I have a Dell PowerEdge 830 Server running Windows SB Server 2003. It has 4gbs of RAM and a ATA CERC SATA 6CH controller with 3 160gb drives in a Raid 5 configuration. The Problem I am seeing Admin ---"Disk Activity Alert on Server" emails These often occur when disk backups, de-frag or high disk usage is going on. Generally the server isn't over stressed. The Disk Alert emails say in part ... The following disk has low idle time, which may cause slow response time when reading or writing files to the disk. Disk: 0 C: F: D: Review the Disk Transfers/sec and % Idle Time counters for the PhysicalDisk performance object. If the Disk Transfers/sec counter is consistently below 150 while the % Idle Time counter remains very low (close to 0), there may be a problem with the disk driver or hardware. The Questions I have: With what utility can I review the Disk Transfers/sec and Idle Time? It appears there is no utility for that on the server! I think I may need to download a very large (two DVD) Dell "OpenManage" utility to be able to monitor the raid system and see what is a problem is that true?

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