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• Fiber Channel Loop vs Point to Point

  - by RandomInsano

  So, I'm playing with a couple of QLogic QLA2340s connected directly together. I've got options here to either have them act as a loop, or in point to point mode. What's the difference if I'm only going to have two machines connected together? Is point-to-point more efficient? The firmware has an option to prefer loop, then fall back to p2p. Anyone have any idea if there are performance benefits or drawbacks? It's pretty hard to find that information.

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• Can't Install Windows 2008 R2 on Lenovo Laptop With SSD

  - by Ben

  I am trying to install Windows Server 2008 R2 on a new Lenovo X201 or T410 laptop. Setup halts with the following pop-up: A required CD/DVD device driver is missing. If you have a driver floppy disk, CD, DVD, or USB flash drive, please insert it now. Note: If the windows installation media is in the CD/DVD drive you can safely remove it for this step. The CD drive is obviously working, as it's booting from CD to get to this point. The only thing I can think is that it is to do with the fact they have SSD disks in - but that's just a guess. (Edit - One extra thing that may or may not be relevant: it's the 64 bit version of Server 2008 R2)

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• How do I PXE boot multiple Windows 7 desktops off the same image?

  - by Matt

  Some years ago in my uni days I recall that the uni labs booted windows nt over the network. There was a shared drive for your own stuff, and other than that any changes you did to the running OS were reset when you restarted the machine. Now I'd like to be able to do the same thing with Windows 7. I have found some howto's for this using iSCSI, but I don't want an iSCSI disk for every single PC, I'm wanting one image for multiple PC's. I've also found PXE Boot setups for installing windows locally, but that's not what I want either. How would I go about setting up what I had at uni but with Windows 7 as a OS to netboot? i.e. How do I netboot windows 7 images? I do not want to netboot a windows 7 installer to a pc to install windows locally, I want to run a windows 7 image from memory/network.

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• Does the Win XP/7 dual boot "missing restore points" problem apply to systems with separate hard disks for each O/S?

  - by Robert Oschler

  I'm in the process of installing Windows 7/64 on a system with Windows XP/32 on it. During my research, I read about a problem that occurs in the dual boot scenario where Windows XP deletes Windows 7's restore points when it accesses the Windows 7 volume: http://support.microsoft.com/kb/926185 I found a workaround but it seems pretty painful since it appears to involve using the registry to make the Windows 7 volume appear invisible or "offline" to Windows XP, making sharing disk data between the two O/S annoying since you have to use something like an external storage device to get it done: http://www.vistax64.com/tutorials/127417-system-restore-points-stop-xp-dual-boot-delete.html I was wondering if this problem only occurs with systems that have both O/S installed on the same physical hard drive (in different partitions)? In my case, I will have each O/S on a completely separate physical hard drive. Any other tips would be appreciated. -- roschler

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• I reinstalled OS X and the system was the same as before

  - by slhck

  Strange thing happened. I want so sell my old Macbook and therefore used a disk image of the Snow Leopard DVD that I restored onto an external drive. I booted off the drive and went through the installation steps. Now I really would like to perform "archive and install", as there might be some files that I need later, but I didn't see the option. The only options for installation I had, were, including others, optional printer drivers and Rosetta. So I just clicked through and I wasn't given any other option. After about 45 minutes, my system booted again, and voila, there was my old system. Nothing changed. How should I proceed to actually reset the system? All I have is that Snow Leopard DVD image.

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• Installing Intel Rapid Storage Drivers makes my eSATA Drives act weird

  - by Filip Ekberg

  I have a HP 8530w Elitebook this Laptop got an eSATA port which I want to plug my LaCie d2 Quadra V2 1TB harddrive into. It all works well on a fresh install of Windows 7 without the Intel Chipset drivers installed. However when I install the Intel Rapid Storage drivers or the Intel Matrix software my drive seems to "disconnect" when I use it to much. I have a lot of Virtual PC's on the drive and when I start them the disk somewhat disconnects. What could cause this?

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• Moving files fails due to privileges but they seem to be OK

  - by joaoc

  I am trying to copy old files from an OS X 10.5.8 to a new external HD. When trying to copy a folder I get the message: The operation cannot be completed because you do not have sufficient privileges for some of the items. I've checked the privileges and they seem ok (read & write for me). What is curious is that the folder is created empty on the target drive and I can then copy the contents from inside the original folder to inside the new folder without changing anything else. This happens with several folders but not all and is making backup a pain. I have to figure out which folder broke the copy, copy its contents to the external disk and then select what hasn't been copied to copy (and eventually stop at some point and repeating the experience)

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• Computer shutsdowns when trying to boot

  - by Zexanima

  I have an IBM ThinkCentre, and I was talking to someone on Skype when it suddenly just shutoff. When I rebooted it asked me to start windows normally or in safe mode, but as soon I choose an option (Any of them) it shuts back down. So I thought it was a problem with windows and tired booting from a Hirens disk, but same thing. I've been using this computer without problems for over a year know. Any idea's for me to try? Unfortunatly I don't have any powersupplies or extra RAM to switch out to try anything like that. EDIT I left it off for a while and it's booting to windows now. I would still like to know what might have been causing it to do that if you have any ideas.

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• Dedicated server configuration - some tips -Xenserver/Debian

  - by Sanjay S

  I am migrating from a vps based hosting to a dedicated hosting (8GB RAM/1TB HD). I need to run multiple Drupal and Ruby based applications? what would be the recommended configuration. I was thinking of two options. 1) Install multiple Debian os on top of Xen (like VPS). Each may be 2GB Memory and run Drupal and Ruby and MYSQL on separate partitions . 2) Install one instance of Debian. and Install Drupal (Apache, php) Ruby (lighttpd, ruby) ,MySQL all in the same partition I was little worried that option 2 could lead to some performance issues later..

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• What is the difference in RAM speeds?

  - by jasondavis

  I am building a new PC with the intel i7-930 processor. I am wanting to use 12gb of RAM for it (6x2gb sticks). Here is some of the RAM I am looking at G.SKILL 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Triple Channel Kit Desktop 2 of these 3 stick kits. They are rated at 1600 however some of the user reviews on that product say they xcould not get it to run at 1600 and the supplier who makes the RAM made a comment that "I7 doesn't support over DDR3 1066" So I am curious, I do not know much about this, I know the more GB of RAM the better but as for the speeds, I am not sure how much of a difference it makes. So can someone explain to me what the difference in performance may be based on speeds of 1200 vs 1600 ram?

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• Linux, fdisk: change order of partitions

  - by osgx

  I have a harddrive with 24 logical partitions on it. Half of them are Linux and half are windows. Current ordering is: 3 Linux partitions; 12 windows partitions; 9 Linux partitions. In this setup, Windows can access any of partition (no limits on partition number), but Linux can't access sda16, sda17 ... Can I change numbering of partitions without moving them on disk? I want to put all Linux partitions to be <16; and windows partitions to be 16, so linux will be able to access all linux partitions. I have fdisk/sfdisk and it sees all partitions.

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• opennebula VM submission failure

  - by user61175

  I am new to OpenNebula, the cloud is up and running but the VM is failed to be submitted to a node. I got the following error from the log file. ERROR: Command "scp ubuntu:/opt/nebula/images/ttylinux.img node01:/var/lib/one/8/images/disk.0" failed. ERROR: Host key verification failed. Error excuting image transfer script: Host key verification failed. The key verification keeps failing. I need to know what is going wrong ... thanks :)

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• Is RAID 0 or JBOD better for home media server?

  - by Donald Hughes

  I have an external two-bay drive enclosure (the OWC Mercury Elite-AL Pro) connected to a Mac Mini (my home media server) over FireWire 800. I'm streaming media to other computers in the house over wired gigabit. I have two 1.5 TB drives that I'm using independently right now. The media is on one, and I'm mirroring the files to the other drive at night as a backup. But as I approach filling up the drive I'm wanting to span those two drives together to give me a total of about 3 TB, and then buy another drive for backups. The external enclosure supports both RAID 0 and JBOD, but I'm not clear on which would be better in this situation. Would RAID 0 provide any performance improvements over JBOD for streaming video (possibly several streams at once? How does each affect the MTBF of the drives? In general, should I choose RAID 0, JBOD, or keep them independent?

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• Postgres 9.0 locking up, 100% CPU

  - by Jake

  We are having a problem where our Postgres 9.0 server occasionally locks up and kills our webapp. Restarting Postgres fixes the problem. Here's what I've been able to observe: First, usage of one CPU jumps to 100% for a few minutes Disk operations drop to ~0 during this time Database operations drop to 0 (blocks and tuples per sec) Logs show during this time: WARNING: worker took too long to start; cancelled WARNING: worker took too long to start; cancelled No Queries in logs (only those over 200ms are logged) No unusually long-running queries logged before or during Then the second CPU jumps to 100% The number of postgres processes jumps from the usual 8-10 to ~20 Matched by a spike in Postgres Blocks per second (about twice normal) Logs show LOG: could not accept SSL connection: EOF detected Queries are running but slow Restarting postgres returns everything to normal Setup: Server: Amazon EC2 Large Ubuntu 10.04.2 LTS Postgres 9.0.3 Dedicated DB server Does anyone have any idea what's causing this? Or any suggestions about what else I should be checking out?

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• Uninstall last n of ports/packages

  - by Radio

  While compiling some port, I realized that it depends on 1000+ of other ports and will install forever until I die or my disk is full (my hdd is really small). I interrupted make install clean. How do I uninstall and clean those dependencies which have already been built and installed? (there are at least 100+ of them) pkg_cutleaves wont work in this case, since the main port wasn't registered yet. Please help. FreeBSD 9.0-RELEASE amd64 EDIT: Another way to ask this question: How can I see all dependencies for a non-registered port, and all subdependencies for those dependencies, independent with previously installed ports or their [sub]dependencies?

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• Ext3 partition doesn't mount on Snow Leopard using MacFUSE

  - by Fez

  I'm dual-booting OS X and Ubuntu on a Macbook 4,1. I'm trying to mount my Linux partition in OS X. I installed MacFUSE 2.0.3,2 and fuse-ext2-0.0.7 on Snow Leopard 10.6.5. I created the directory /Volumes/Ubuntu and tried to mount the disk there using the command: fuse-ext2 /dev/disk0s4 /Volumes/Ubuntu/ This is the output I get: fuse-ext2: version:'0.0.7', fuse_version:'27' [main (../../fuse-ext2/fuse-ext2.c:324)] fuse-ext2: enter [do_probe (../../fuse-ext2/do_probe.c:30)] fuse-ext2: Error while trying to open /dev/disk0s4 (rc=13) [do_probe (../../fuse-ext2/do_probe.c:34)] fuse-ext2: Probe failed [main (../../fuse-ext2/fuse-ext2.c:340)] Any clue what's going wrong? Thanks!

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• Lion refuses to be installed to any partitions on Mac

  - by Arafinwe

  I was attempting to install Lion on my MacBook 7-1, on which I have installed Ubuntu 10.04 on a separate partition. Currently, my partitions look like this: |-----Mac-----|-Grub-|----Ubuntu----|-Ubuntu Swap-|. However, Disk Utility (and I assume the rest of Mac OS X) sees it as |-----Mac-----|-----Unknown-----|. Note that I am using rEfit as my default bootloader. When attempting to install Lion, I am greeted by this screen: By the way, it appears that only the Grub partition is recognized, as I remember setting it to about 10 MB. Can anyone help with this?

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• CPU's on Hyper-V host system is just idling, even though VM's are at full throttle

  - by Bjørn

  Hello, I have a server that is running Windows 2008 64 bit Hyper-V, with 8 gigs of RAM and Intel Xeon X3440 @ 2.53 Ghz, which gives me 8 logical cores in the performance monitor on the host system. I have set up three Virtual Machines, all running Windows 2008 32 bit. Build server, running Team City Staging server SQL Server, running SQL Server 2005 These three machines are running very sluggishly, they are at 100% cpu even though the host system is barely using any cpu at all, typically below 10% total. Could anyone please give some tips as to the best setup for CPU allocating? Should I have set each server to have two cores, or should I increase this number above the total number of cores on the host? What is a good number to set on the Virtual Machine Reserve and Virtual Machine Limit? Is 8 gigs of physical RAM insufficient for 3 VM's? Thanks for reading. :)

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

  - by sunpech

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

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• Cleaning Up Unused Users and Groups (Ubuntu 10.10 Server)

  - by PhpMyCoder

  Hello experts, I'm very much a beginner when it comes to Ubuntu and I've been learning the ropes by diving in and writing a (backend-language independent) web app framework that relies on apache, some clever mod_rewrites, Ubuntu permissions, groups, and users. One thing that really annoys my inner clean-freak is that there are loads of users and groups that are created when Ubuntu is installed that are never used (Or so I think). Since I'm just running a simple web app server, I would like to know: What users/groups can I remove? Since you'll probably ask for it...here's a list of all the users on my box (excluding the ones I know that I need): root daemon bin sys sync man lp mail uucp proxy backup list irc gnats nobody libuuid syslog And a list of all of the groups: root daemon bin sys adm tty disk lp mail uucp man proxy kmem dialout fax voice cdrom floppy tape sudo audio dip backup operator list irc src gnats shadow utmp video sasl plugdev users nogroup libuuid crontab syslog fuse mlocate ssl-cert lpadmin sambashare admin

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• Ubuntu only boots with USB plugged in

  - by Ben

  I'm new to the Linux world so please bear with me! :-) I installed Ubuntu via USB drive onto my hard drive. If I boot the PC without the usb drive I used, Ubuntu will not load. After booting I can unplug without any consequences. I looked on the hard drive and there is a boot folder. On the USB drive, this is the tree contents: /media/disk$ tree . |-- adtext.cfg |-- boot.cat |-- f10.txt |-- f1.txt |-- f2.txt |-- f3.txt |-- f4.txt |-- f5.txt |-- f6.txt |-- f7.txt |-- f8.txt |-- f9.txt |-- initrd.gz |-- isolinux.bin |-- isolinux.cfg |-- ldlinux.sys |-- linux |-- menu.c32 |-- menu.cfg |-- po4a.cfg |-- prompt.cfg |-- splash.png |-- stdmenu.cfg |-- syslinux.cfg |-- text.cfg |-- ubnfilel.txt |-- ubnpathl.txt `-- vesamenu.c32 Am I correct in my assumption that the boot aspect is associated to the USB drive? If so, how do I get it to boot without the USB? I'm guessing copying into some location and modifying grub?

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

  - by Vlad

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

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• Mac OS X - rmdir fails with "Operation not permitted" for a folder created by a PC on a removable dr

  - by maxint

  Hello. I have a problem (using Mac OS X 10.5.8) with the access rights of a folder that was presumably created by a virus on a disk-on-key drive when I used it with a PC. I can't remove the folder or change it's name. In Finder's Info window the Lock box is unchecked and uncheckable - if I try to check it it flips back to off. Please see the details: MaxBookAir:GARMIN'S maxint$ rmdir winamp_cache_0001/ rmdir: winamp_cache_0001/: Operation not permitted MaxBookAir:GARMIN'S maxint$ MaxBookAir:GARMIN'S maxint$ mv winamp_cache_0001 test mv: rename winamp_cache_0001 to test: Operation not permitted MaxBookAir:GARMIN'S maxint$ MaxBookAir:GARMIN'S maxint$ GetFileInfo winamp_cache_0001 directory: "/Volumes/GARMIN'S/winamp_cache_0001" attributes: avbstclinmedz created: 12/23/2009 14:34:52 modified: 02/13/2010 22:52:36 MaxBookAir:GARMIN'S maxint$ MaxBookAir:GARMIN'S maxint$ stat -x winamp_cache_0001 File: "winamp_cache_0001" Size: 32768 FileType: Directory Mode: (0777/drwxrwxrwx) Uid: ( 502/ maxint) Gid: ( 20/ staff) Device: 14,5 Inode: 7439 Links: 1 Access: Wed Dec 23 00:00:00 2009 Modify: Sat Feb 13 22:52:36 2010 Change: Sat Feb 13 22:52:36 2010 MaxBookAir:GARMIN'S maxint$ MaxBookAir:GARMIN'S maxint$ stat -r winamp_cache_0001 234881029 7439 040777 1 502 20 0 32768 1261506600 1266081756 1266081756 1261559092 131072 64 32768 winamp_cache_0001 MaxBookAir:GARMIN'S maxint$ MaxBookAir:GARMIN'S maxint$ ls -lTd winamp_cache_0001/ drwxrwxrwx 1 maxint staff 32768 Feb 13 22:52:36 2010 winamp_cache_0001/ MaxBookAir:GARMIN'S maxint$

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• gparted won't boot from liveCD

  - by ant2009

  Hello, Fedora 12 2.6.32.9-70.fc12.i686 I downloaded the gparted iso and burnt it to a CD. gparted-live-0.5.2-1 This GParted Live was created by: create-gparted-live -l en -b u -e e -d sid -m http://free.nchc.org.tw/debian -s http://free.nchc.org.tw/debian-security -g http://free.nchc.org.tw/drbl-core -n 2.6.32-3 -i 0.5.2-1 The files and folders: isolinux live syslinux COPYING GParted-Live-Version I put the disk in and reboot. Nothing happens. I just get a flashing cursor in the top left hand corner. I then have to switch of the power button to get it to reboot. I have done this a number of time and the results are the same. Can anyone tell me how to boot from the gparted liveCD? Many thanks for any suggestions,

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• NX Client running on OS X 10.6.3 => NX Server Ubuntu 10.04: weird keymapping issue

  - by Mike D

  I have been using Ubuntu 9.10 at work after switching from vista. After being (expectedly) disappointed with performance over VNC (via VPN) when logging in from home, I came across the NOMACHINE suite. Last week, I upgraded from OS X 10.6.2 = 10.6.3 at home. After that, I also updated my NX Client at home to the latest version, as there were issues with recent changes in the OSX X11 setup that rendered the NX connection useless. At that point, everything worked fine. Fast forward, I upgraded from 9.10 = 10.04 on my work machine the next day, and after coming home and trying to log-in remotely, I noticed that the "s" and "m" keys, when pressed locally, acted as if the meta key was being pressed on the remote machine. That is, the "s" key opens in the Ubuntu login menu (the power icon), and the "m" key opens the messaging menu. I found some info on using xmodmap to remap keys, however, I can't even begin to fathom what keys I could remap to solve this issue. Any ideas?

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