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• Shopping for Fast USB Flash Drives

  - by Jim McKeeth

  I would like to pick up some really fast USB flash drives in the 16 - 64 GB range. When looking at drives they just list their size, their form factor (key chain hook, slider, etc.) and the fact that they are all Hi-Speed USB 2.0. It seems like I have heard that different drives have different performance and life expectancy. The sales guy tells me that they are all the same performance any more, but it wouldn't be the first time a sales guy had the wrong technical details. Our objective is to run Virtual PC images off of them, so good speed and resilience to rewrites it important.

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• Forgot to unmount/eject external hard drive, lost moved files. Mac OS X

  - by balupton

  So I was using my Mac with my external hard drive connected via USB. I moved about 10 GB of data to it (via drag and drop while holding down the Command key to move the files rather than to copy them). They moved to the drive all right, but as I was having some issues and the Finder crashed after the transfer, I was unable to eject the volume and later everything froze so I had to do a hard restart (hold the power button). When I remounted the volume (plugged the external hard drive back in) it no longer had any of the files which I moved onto it. As it was a lot of data, how can I recover these files?

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• PostgresQL on Amazon EBS volume, realistic performance, or move to something more lightweight?

  - by Peck

  Hi, I'm working on a little research project, currently running as an instance on ec2, and I'm hoping to figure out whether I'm going down the right path. We, like a thousand other people, are making use of some of twitters streaming feeds to do gather some data to have fun with and my db seems to be having problems keeping up, and queries take what seems to be a very long time. I'm not a DBA by trade, so I'll just dump some info here and add more if need be. System specs: ec2 xl, 15 gigs of ram ebs: 4 100 gb drives, raid 0. The stream we're getting we're looking at around 10k inserts per minute. 3 main tables, with the users we're tracking somewhere in the neighborhood of 26M rows currently. Is this amount of inserts on this hardware too much to ask out of ebs? Should take a look at some things with less overhead like mongodb?

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• Hypertransport sync flood error

  - by Carl B

  What is it? And what causes it? Is it only for uncorrectable DIMM Errors(Troubleshooting DIMM errors)? When an UCE occurs, the memory controller causes an immediate reboot of the system. During reboot, the BIOS checks the Machine Check registers and determines that the previous reboot was due to an UCE, then reports this in POST after the memtest stage: A Hypertransport Sync Flood occurred on last boot 3 BIOS reports this event in the service processor’s system event log (SEL) as shown in the sample IPMItool output There are what seems to be some suggested answers to include Bad Caps Bios verisons (happens in one version not the other) Graphics card issues Lack of power to the CPU The list of possible generators seems to target everything but the computer case. System Specs: Windows Home Premium 64 Motherboard - MSI790FX-GD70 (MS7577) / Bios v 1.9 (American Megatrensa Inc) Ram - Patriot G Series ‘Sector 5’ Edition 4GB DDR3 1600 CPU - AMD Phenom II X2 555 Black Edition Callisto 3.2GHz Socket AM3 80W (Note: unlocked 2 cores CPU Z ids it as phenom II x4 B55) Graphics - 2 x Radeon 5750 in crossfire PSU - ABS 900w HDDs - 2 Seagate 1.5 TB Sata SSD - 1 OCZ 120 GB Vertex Plus R2

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• Maximum disk size for a Debian 6 VMware installation?

  - by Mohamed Abobakr

  I'm planning to install a variety of Linux distributions on VMware Player to get more experience with Linux (I've only used Fedora back in university). I'm starting with Debian 6.0.5 Squeeze, and have already downloaded the small CD i386 netinst image. In the new virtual machine wizard, it's asking me for the maximum disk size of the image. It says that the recommended size for Debian 6 is 8 GB. However, I'm trying to figure out what is the absolute minimal size that I can get away with, since I'm only testing it out with very few software installations (mainly testing web server applications).

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• Proper way to re-image Windows 7?

  - by Alec

  I had a driver completely fail on me so I have to restore my computer from a system image backup. I used an installation DVD to run the Re-Image utility on there, but after 8 hours of "preparing the image" to be restored, it began restoring to my hard drive. After 12 hours there, it was 5-8% complete. I figured I must have done something wrong or it started doing something wrong. So I installed a fresh copy of Win-7 and ran the utility from there. It's going at the same snail's pace. I still think I must be doing something incorrectly - I don't see how it could possibly take so long, I could probably manually flip the on my hard drive and be done before that utility. Am I doing this correctly or is there something else I should be doing? Edit: In case my hardware is relevant: Win 7 64 bit Core i7 8 GB Ram 640GB Internal 1TB External connected via eSATA I had approximately 400GB of data on my computer before it crashed.

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• How to higly compress files

  - by Alfred James

  I want to learn how can we higly compress a file. I have downloaded files whose compressed size was 4 gb and after expanding they became 10GB file. So Which software I need to use for such high compression? Will I lose quality of the data by compression? If you direct me to Winrar or 7zip, please tell me how can I higly compress a file cuz I have tried compression with it but the size was reduced just by few MBs. I am compressing games like .exe files. Thanks

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• Dummy HTTP server for debugging

  - by Andrea

  This is more or less the inverse of my previous question. I need to debug some HTTP requests that I am making. Since these requests arise from the use of some external libraries, sometimes I am not sure of what is the actual data I am sending. Is there some dummy server (for Linux) that accepts HTTP requests and just prints them somewhere so that I can inspect them? I would like to be able to see in plain text the full request, like POST /foo HTTP/1.1 Host: www.example.com Accept: text/xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5 Accept-Language: en-gb,en;q=0.5 Content-Type: text/plain Content-Length: 11 Hello world

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• Can we increase Torrent share ratio using Local Peer Discovery?

  - by Jagira

  I just want to know whether this is a flaw or not in Bittorrent system. Let us assume that I am member of a Private Torrent site which requires me to maintain a specific upload to download ratio. Will this work: I create a torrent of a large file say [ Fedora Linux ~ 4 GB ] and upload it to the tracker I download the same torrent using my ID and start it on another machine on LAN or a Virtual machine Both clients have Local Peer Discovery enabled, so they will find 'em [ not via DHT ] and start x'ferring data using LAN bandwidth at LAN speeds. Though both uploads and downloads will increase, my ratio will also increase If I reiterate the entire process 'n' times, the numerator in the "RATIO" i.e Upload will become so large that the effect of downloads on ratio will become less. I want to know whether this is legitimate???

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• How do you create a bootable partition on a USB drive?

  - by Nathan DeWitt

  I have a bootable ISO designed to be burned to a double-layer DVD. I don't have a double layer DVD burner, so I would like to stick the ISO image on a 50 GB partition on a USB hard drive I have. How do I get the boot info onto the hard drive? If it helps, it's an OSx86 Live CD. Attempt 1: booted into Ubuntu 9.04 LiveCD deleted the partition on my existing USB hard drive sudo dd if=/path/to/image.iso of=/dev/MyUSB booted to USB drive error: Error Loading OS Atempt 2: booted into Ubuntu 9.04 LiveCD deleted the partition on my existing USB hard drive sudo mkdosfs -I -v -n iPC /dev/MyUSB sudo syslinux /dev/MyUSB sudo dd if=/path/to/image.iso of=/dev/MyUSB booted to USB drive error: Selected boot device not available - strike F1 to retry boot, F2 for setup utility

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• Chrome not selecting correct language for Help tab

  - by Andy

  When I click Help in Chrome, a new tab appears with the Google help links etc as expected, but I have a message saying: "This Help Centre is not currently available in your language...", etc. The drop down box at the bottom is not selected correctly for en-GB (my location). Instead it is set at the first language on the list. This happens if I am signed in to my Google account or not. Selecting English from the drop-down works ok, so no great drama. Just wondering if anybody else sees this behaviour? EDIT: Using current stable build 8.0.552.224

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• How is memory allocated in ESXi server?

  - by Samselvaprabu

  We have an ESXi 4.1 server with 48 GB RAM. For each VM, we are allocating 4GB of memory. Since the server will have 13 virtual machines, my manager thinks this is wrong. I am going to explain to them that ESXi will actually manage memory itself, but they asked me how much memory I allocated for the ESXi server itself. I did not allocate any (I have not even heard of an option for allocating memory for the ESXi server itself). How is memory allocated for ESXi server? How does it over-allocate/distribute RAM among virtual machines without issue?

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• How to securely store and update backup on remote server via ssh/rsync

  - by Sergey P. aka azure

  I have about 200 Gb of pictures (let's say about 1 mb/file, 200k files) on my desktop. I have access (including root access) to remote linux server. And I want to have updateable backup of my pictures on remote server. rsync seems to be the right tool for such kind of job. But other people also have access (including root access) to this server and I want to keep my pictures private. So the question is: what is the best way to keep private files on remote "shared" linux server securely?

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• Windows 7 safe mode pretends it's Windows XP?

  - by Joachim Kerschbaumer

  Just a question in between. A friend of mine brought me a laptop that does not work anymore and wanted me to check whether I can do something. She told me it's Windows 7, and startup screen and login screen look like it. However, as she gets a bluescreen on startup it is only possible to boot in safe mode where the system pretends to be Windows XP SP3. The system also may have 1 GB of RAM but the system itself states that it has 954 MB of RAM which is a value I've never seen before. Is everything corrupt from operating system to hardware, or am I just a newbie that does not know that Windows 7 pretends to be Windows XP SP3 in safe mode? Or is this laptop just the victim of an illegal, crazy copy of Windows XP sold as Windows 7? Maybe some strange Chinese stuff? I also recognized that the startup screen of Outlook Express reads "Outllok Express" (no typo) I´m kind of confused, maybe someone could put light into this ;)

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• Does shutdown idle VMs improve the performance?

  - by Samselvaprabu

  Often our team members are coming to me with a compliant that their VMs are slow. Our team members suggested to shutdown some of the VMs temporarily and try to access the VM. But most cases that would not help. Assume that i have assigned 4 GB for and 2 CPUs for my VM. So ideally it should not face performance issue. As our ESXi 4.1 server has multiple VM in the same server (we have overcommited memory and CPU). Does shut down other VM really helps to improve performance or not? [Note : We are using ESXi 4.1 and our hardware is R710 server. We have more number of VMs in single server so we have overcommited memory.]

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• smallest footprint for Web Application server?

  - by edgardodelamanta

  There are times when you need to spare hardware resources (either to keep using legacy hardware, to play the embedded card, or just to be efficient because a large footprint is trashing CPU caches, leading to unacceptable levels of idle-states). In this spirit, some efforts have been made to make 'light' ports of Java or Mono (C# for Linux), and they range in the 80-50 MB (instead of the 100-200 MB). Add a Web server (Apache, IIS, etc.) to the scripting engine and you can happily dive into the GB (IIS + .Net) only to load the tool in memory. Anybody with more modest tools in the specs area?

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• Restoring using SyncBack without profiles

  - by Thomas Matthews

  I backed up my internal hard drive (C:) using SyncBack onto an external (USB) hard drive with maximum compression. I then performed a clean install of Windows Vista onto the computer. I forgot to copy the SyncBack logs before the clean install. And now when ever I try to restore a directory, the RAR/ZIP files are copied to the system hard drive instead of extracting their contents to the hard drive. Also, SyncBack is not traversing the folders during the Restore process. How can I tell SyncBack to expand the compressed files? I am running the freeware version of SyncBack. I have to create new log files (unless SyncBack put them somewhere on the external drive). My alternative is to write a program that traverses the folders on the external drive and extracts files from the RAR/ZIP files. I am using Windows Vista, Service Pack 2, and the data size prior to backup was about 200 GB. (The backup process took over 72 hours due to "hiccups").

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• Boot Camp fails to create a Windows partition because it can't move files

  - by Jens Bannmann

  I'm running Mac OS X 10.6 (Snow Leopard) on a mac with a 320 GB drive, 167GB free space, and I can't get Boot Camp running. The wizard starts creating the Windows partition, but fails with a message claiming it cannot move some files. The message suggests to back up my hard disk, reformat it, restore my files, and re-run Boot Camp wizard. The problem is: Though I do have backups (Time Machine), I don't feel like formatting my hard disk right now :-) I found a thread in some forum discussing this problem. The suggestion was to defragment my volume with iDefrag, and lots of people claimed that solved the issue. So I went ahead and got iDefrag 1.7.1, created a bootable DVD and chose the "compact" setting recommended before partitioning - but still no luck with Boot Camp! So how do I get this working? Fun note: last year, I briefly set up Boot Camp with 10.5, and it worked perfectly. Probably I did not use that much hard disk space back then...

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• What could cause my browserS to keep crashing?

  - by Guy Thomas

  The situation: Windows 7 ultimate on standard box 4 GB RAM. The problem: IE 8 kept on crashing. Tried upgrading to IE 9 - no better. Then I thought I will have to kick IE into touch and go with Firefox. Same problem Firefox crashes. Gave Chrome a chance - same problem the browser just says sorry, and closes / restarts. Other problems, this is not the best machine I have ever had, Word sometime closes unexpectedly, and I have trouble with Microsoft Updates failing first time.

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• How to open first n bytes of file in hexadecimal and edit it?

  - by Larssend

  I want to edit some .avi videos (cut them, to be precise) in VirtualDub but it failed to open the files. They are encoded in xvid, which I have installed, and play in KMPlayer without problem. Also, all other xvid videos can be opened and cut just fine by VirtualDub. I suspect there's something wrong in the first few bytes of these particular videos (the magic number?). This means I have to open the offending files in a hex editor and make some necessary adjustments to the header. Problem is, they are very large ( 3 GB each) and take very long time to open in UltraEdit. Can UltraEdit open just the first few bytes of a file? If not, do you know of an application that can do that? Edit: I'm using Windows XP.

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• Computer is really slow

  - by joshhunt

  I'm not exactly sure when exactly it started happening, but my computer now is extremely slow. Originally, I have been using this computer for all sorts of stuff: Photoshop, web design/development, movies and even some light (Warcraft 3) gaming. I have been running it with Windows XP But now it is very, very slow, and I don't know how, why or when this happened. After I noticed the slowness, I removed Windows XP and installed Windows 7 on it, but it is still very slow. Now watching videos is unbearable at full screen (slow frame rates, audio out of sync) and painful when made smaller. Why would this happen? What would cause this? I am starting to think it is a hardware problem (the CPU has died or something), but I don't even know if that is possible. The PC is running with 1GB of RAM, three hard drives (all up, something like 400 GB) and I think a 1.6GHz processor

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• Importing Outlook 2007 rules error

  - by Alex

  I'm trying to move an Outlook 2007 account (POP3, no Exchange) to a new machine and I'm having trouble importing the rules from the old machine to the new one. Here is the deal, I imported the .pst file on the new machine but when I try to import the rules, every single one of them brakes. The folders and sub-folders hierarchy is preserved upon the import of the .pst but the rules don't point to the right folder in the respective rule. Instead it points to "the specified folder". Same OS (Windows XP), same mail client (Outlook 2007) and the .psf file is about 8 GB. Any help i greatly appreciated.

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• Build and migrated to software raid (mdadm) on GPT disk, now can't assemble array

  - by John H

  mdadm, gpt issues, unrecognized partitions. Simplified question: How do I get mdadm to recognize GPT partitions? I have been attempting to convert/copy my Ubuntu 11.10 OS from a single drive to software raid 1. I have done similar in the past, but in this case, I was adding in a drive that has been configured for GPT and I tried to work with that without fully looking into the implications. Currently, I have a non-booting mdadm RAID 1 array of /dev/md127 (the OS assigned that and it keeps picking up). I am booting off of live USB keys, currently System Rescue CD from sysresccd. While gdisk and parted can see all the partitions, most of the OS utilities do not, including mdadm. My main goal is just to make the raid array accessible so I can get pull the data and start fresh (without using GPT). /dev/md127 /dev/sda /dev/sda1 <- GPT type partition /dev/sda1 <- exists within the GPT part, member of md127 /dev/sda2 <- exists within the GPT part, empty /dev/sdb /dev/sdb1 <- GPT type partition /dev/sdb1 <- exists within the GPT part, member of md127 History: POINT A: The original OS was install on sda (actually /dev/sda6). I used a the Ubuntu live usb to add sdb. I got warning from fdisk about GPT so I used gdisk to create a raid partition (sdb1) and mdadm to create a raid1 mirror with a missing drive. I had many issues getting this working (including being unable to get grub to install) but I eventually got it to boot using grub on sda and /dev/md127 off of sdb. So at point A, I had copied my OS from sda6 to md127 on sdb. I then booted into a rescue mode and attempted to get a bootloader onto sdb, which failed. I then discovered my mistake: I had installed the raid onto sdb instead of sdb1, essentially overwriting the sdb1 partition. POINT B: I now had two copies of my data- one on md127/sdb, and one on sda. I destroyed data on sda and created a new GPT table on sda. I then created sda1 for the raid array, and sda2 for a scratch partition. I added sda1 into the raid array and let it rebuild. md127 now covered /dev/sdb and /dev/sda1 as fully active and synced. POINT C: I rebooted onto linux rescue again and was still able to access the raid array. I then removed /dev/sdb from the array and created /dev/sdb1 for the raid. I added sdb1 to the array and let it sync. I was able to mount and access /dev/md127 without issues. Once it completed, both /dev/sda1 and /dev/sdb1 were GPT partitions and actively syncing. POINT D (current): I rebooted again to test if the array would boot and grub failed to load. I booted off of my live thumb drive and found that I can no longer assemble the raid array. mdadm doesn't see the required partitions. -- root@freshdesk /root % uname -a Linux freshdesk 3.0.24-std251-amd64 #2 SMP Sat Mar 17 12:08:55 UTC 2012 x86_64 AMD Athlon(tm) II X4 645 Processor AuthenticAMD GNU/Linux === /proc/partitions and parted look good: root@freshdesk /root % cat /proc/partitions major minor #blocks name 7 0 301788 loop0 8 0 976762584 sda 8 1 732579840 sda1 8 2 244181703 sda2 8 16 732574584 sdb 8 17 732573543 sdb1 8 32 7876607 sdc 8 33 7873349 sdc1 (parted) print all Model: ATA ST31000528AS (scsi) Disk /dev/sda: 1000GB Sector size (logical/physical): 512B/512B Partition Table: gpt Number Start End Size File system Name Flags 1 1049kB 750GB 750GB ext4 2 750GB 1000GB 250GB Linux/Windows data Model: ATA SAMSUNG HD753LJ (scsi) Disk /dev/sdb: 750GB Sector size (logical/physical): 512B/512B Partition Table: gpt Number Start End Size File system Name Flags 1 1049kB 750GB 750GB ext4 Linux RAID raid Model: SanDisk SanDisk Cruzer (scsi) Disk /dev/sdc: 8066MB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 31.7kB 8062MB 8062MB primary fat32 boot, lba === # no sda2, and I double the sdb1 is the one shown in parted root@freshdesk /root % blkid /dev/loop0: TYPE="squashfs" /dev/sda1: UUID="75dd6c2d-f0a8-4302-9da4-792cc7d72355" TYPE="ext4" /dev/sdc1: LABEL="PENDRIVE" UUID="1102-3720" TYPE="vfat" /dev/sdb1: UUID="2dd89f15-65bb-ff88-e368-bf24bd0fce41" TYPE="linux_raid_member" root@freshdesk /root % mdadm -E /dev/sda1 mdadm: No md superblock detected on /dev/sda1. # this is probably a result of me attempting to force the array up, putting superblocks on the GPT partition root@freshdesk /root % mdadm -E /dev/sdb1 /dev/sdb1: Magic : a92b4efc Version : 0.90.00 UUID : 2dd89f15:65bbff88:e368bf24:bd0fce41 Creation Time : Fri Mar 30 19:25:30 2012 Raid Level : raid1 Used Dev Size : 732568320 (698.63 GiB 750.15 GB) Array Size : 732568320 (698.63 GiB 750.15 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 127 Update Time : Sat Mar 31 12:39:38 2012 State : clean Active Devices : 1 Working Devices : 2 Failed Devices : 1 Spare Devices : 1 Checksum : a7d038b3 - correct Events : 20195 Number Major Minor RaidDevice State this 2 8 17 2 spare /dev/sdb1 0 0 8 1 0 active sync /dev/sda1 1 1 0 0 1 faulty removed 2 2 8 17 2 spare /dev/sdb1 === root@freshdesk /root % mdadm -A /dev/md127 /dev/sda1 /dev/sdb1 mdadm: no recogniseable superblock on /dev/sda1 mdadm: /dev/sda1 has no superblock - assembly aborted root@freshdesk /root % mdadm -A /dev/md127 /dev/sdb1 mdadm: cannot open device /dev/sdb1: Device or resource busy mdadm: /dev/sdb1 has no superblock - assembly aborted

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• upgrading my computer system for office use

  - by denise ellul

  Presently I have the under-mentioned computer system. What should be changed and upgraded with the following products that I own presently? I am interested in performance issues related to cache memory, bus speed, RAM, CAS latency as well as other considerations. Thanks for your help. Processor (CPU): Intel Celeron Dual Core E3300 2.5 GHz Motherboard: Asus P5QPL-AM G41 Main Memory (RAM): 2 GB Team Elite DDR2 PC8000 Case: Coolermaster RC330 Power Supply Unit: 500W EZ-Cool Standard Storage Device (Hard Drive): 500GB Samsung Video Card: Intel GMA X4500 (On-board) Optical Drive: LG GH22NS50 Sound Card: AC 97 (On – board) Card Reader: Akasa Black TFT Monitor: 19” View Sonic Speakers: Logitech S120 2.0

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• Configuration Tuning for PostgreSQL 9.1 PostGIS 1.5 Ubuntu 12.04 Server

  - by Martin

  My server performance is poor. At times SSH, top, and other features or commands are very slow to respond, taking several seconds or more. A query that normally takes 5 minutes can sometimes take 30 minutes. The database is mostly being used to do a spatial query (grid and summarize) on approximately 500GB of stored data spread between 4 tables. Restarting the server works as a temporary fix, but cannot be used as a long term solution. Any suggestions for how to diagnose and solve my performance issues? Hardware and Configuration: 3.3 GHz Intel quad core i5 16 GB DDR3 RAM 6 TB software RAID 10 (6 x 2 TB drives) Ubuntu 12.04 64-bit Postgres 9.1 PostGIS 1.5

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