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• What is a good partitioning design/scheme for a multi-boot *nix system?

  - by static

  I'm planning to install Debian on my server. I would like to design the partitioning scheme in such a way, that I could install one or more other *nix distributives on that. So, reading many articles I think this scheme could be a good one for the initial idea of multi-boot: /grub /swap /LVM VG1 (for OS1) -> /boot (LV1) / (LV2) /tmp (LV3) /var ... /var/log /home /LVM VG2 (for OS2) -> /boot / /tmp /var /var/log /home ... (other distros) /LVM VG0 (for data) -> /data (LV1) But I'm confused a little bit now: what should be the labels for these partitions (unique or not) and what should be the mounting points looking as (/home (OS1) mounted to /home as well as /home (OS2)...)?

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• Cannot install Oracle Application server

  - by ziftech

  After succesfull installation of database 10g server, I cannot run install file for application server - it closed unexpectly. How can be problem investigated? Log file contains: Checking installer requirements... Checking operating system version: must be 5.0, 5.1 or 5.2. Actual 5.2 Passed Checking monitor: must be configured to display at least 256 colors. Actual 4294967296 Passed Checking swap space: must be greater than 1535 MB. Actual 4092MB Passed Checking Temp space: must be greater than 150 MB. Actual 5083 MB Passed All installer requirements met.

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• MD5 and SHA1 checksum uses for downloading

  - by Zac

  I notice that when downloading a lot of open source tools (Eclipse, etc.) there are links for MD5 and SHA1 checksums, and didn't know what these were or what their purpose was. I know these are hashing algorithms, and I do understand hashing, so my only guess is that these are used for hashing some component of the download targets, and to compare them with "official" hash strings stored server-side. Perhaps that way it can be determined whether or not the targets have been modified from their correct version (for security and other purposes). Am I close or completely wrong, and if wrong, what are they?!?! Thanks!

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• How to have a soft-real-time process in presense of heavily swapping IO-intensive background load?

  - by Vi

  schedtool: PID 32301: PRIO 4, POLICY R: SCHED_RR , NICE -20, AFFINITY 0xf ionice: realtime: prio 4 But the music is stumbling anyway. Background load is low prio (SCHED_IDLEPRIO, idle ionice), but uses a lot of memory (more than is physically available) and does a lot of IO and calculations. Latencytop shows about 1500ms for: Following symlink Writing buffer to disk (sync) Page fault Writing a page to disk both for the bg load and for unrelated processes. Load average is 10 and counting. Why cannot it allocate, for example, 200MHZ of one of the cores and 32M of memory and not less than once per second opportunity for IO for mplayer to make it happy while continuing calculations on the background? Or: why it cannot leave background task and swap loving each other but keeping the rest of the system as if there were no background load? How to have RT processes AND heavy bg load simultaneously (without of virtual machines)?

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• Are there any ebook readers for Win 7 Pro which can display two books side-side?

  - by verve

  I'm trying to learn a language and I want to be able to open the English version of a book and the German one together on the screen to compare etc.I'm particularly interested in displaying Kindle-typebooks side-by-side. I need software that is simple to use and not-too-ugly looking. Ha. Aesthetics seem to matter to me when I'm learning...or, any reader that can display ANY popular ebook formats in parallel form will do! Win 7. IE 9. Freeware or not.

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• changing filesystem format from jfx to ext4 without losing data

  - by A.Rashad

  I have a fresh Lucid Lynx (Ubuntu 10.04) running on a laptop. where I defined the filesystems as: mount point / on ext4 (46 Gb) mount point /home on jfs (63 GB) swap as 3 Gb I left the machine over night to do some task, without AC power supply. next day in the morning I found it on standby, task completed, but filesystem was not reachable. it gave me I/O error it seems that there is a problem with jfs and standby. anyways, to avoid any hassle, I want to move this mount point from jfs format to ext4. can I do this without losing data and without the need to place the data in a temporary location until transformation is done? sorry to mention that, but I recall back in the windows days, we would change a FAT16 to FAT32 or a FAT32 to NTFS without having to lose the data. I hope this is available on Linux.

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• "Disk Not Found" Error when trying to install iso image of CentOs on ESXI using VSphere

  - by kamal

  When trying to install CentOs setup as an iso image on datastore, i get an error : "Disk Not Found". I am using ESXi 4.1 as host VM. Is there a way to attach DVD/CD as iso image ? I tried "Connect at Power on" Checked and Connect CD/DVD on the VSphere Console, but i still am unable ot get the iso image recognized as a DVD mounted image: Solved: if i look at the image size, it was 11 MB, so it WAS a boot iso, but nithing else, if we compare it with other boot images with complete iso's therein lies the solution. This boot.iso was from rBUILD/Conary packaging

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• misaligned raid partition in Ubuntu 10.04

  - by Linux Jedi

  I attached two identical hard drives to my linux machine. Then using gparted I formated the first 1024 mb at the beginning of each drive as linux swap space. Then I went into system-administration-disk utility. In there I went to file-create-RAID array. I selected the remaining space in each of the two identical hard drives and created a striped raid array. After the array was created, a warning message appeared. It said "The partition is misaligned by 522240 bytes. This may result in very poor performance. Repartitioning is suggested." What do I do now? As far as I can tell, the partitions are identical.

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• Compilation of Etherpad fails in an OpenVZ VE

  - by ulf

  Hi everyone. I’m almost giving up, this will be my last try: I try to compile Etherpad on my OpenVZ server. It’s running a Debian 5.0 as the host system, in the VE I’ve got Ubuntu 10.04. I installed Etherpad in this VE with the instructions from the official Ubuntu Wiki: https://wiki.ubuntu.com/Etherpad. Everything runs fine until it comes to compilation. After calling bin/build.sh as described in the wiki the first steps are running fine. But then I’m running into a memory error: java.io.IOException: Cannot run program "cp": java.io.IOException: error=12, Cannot allocate memory Well, I understand the error message but don’t see the cause. The command free tells me that there’s plenty memory left in this VE: total used free shared buffers cached Mem: 2415236 1140872 1274364 0 0 0 -/+ buffers/cache: 1140872 1274364 Swap: 0 0 0 Beautiful. But even repeating the compilation process doesn’t bring me any further. Any help would be appreciated.

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• DOSBox 8.3 filenames disagree with Windows 7

  - by wes

  When I compare a dir in DOSBox 0.74 against a dir from Windows 7 command prompt, the 8.3 filenames differ. Long format (both drives and directories): 2012-07-30_abcdefg-abcde 2012-07-30_abcdefg-abcde.7z 2012-08-06_abcdefg-abcde 2012-08-06_abcdefg-abcde.7z 2012-10-22_IIS-LogFiles 2012-10-22_IIS-LogFiles.zip 2012-11-14_selective-abcde DOSBox 0.74 (dir): 2012-0~1 2012-0~3 2012-1~1 2012-1~3 2012-0~2 7Z 2012-0~4 7Z 2012-1~2 ZIP Windows 7 (dir /x): 2012-0~1 2012-0~1.7Z 2012-0~2 2012-0~2.7Z 2012-1~1 2012-1~1.ZIP 2012-1~2 so for instance if I'm passing in a path to DOSBox, sometimes this happens and whatever I'm trying to automate will fail. Why the difference, and can I change any settings to help DOSBox generate the correct shortnames?

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• Dell PowerEdge 6850 Degraded HDD

  - by Matt

  Good Morning, We have a dell power edge 6850 with a degraded drive in the RAID array. I have never had to recover such an issue, so any help or advice would be welcome. Basically it hasn't affected the server at an operating system level, but has slowed down performance, I have a replacement drive in hand but as this is our main database server I want to proceed with extreme caution. My options as I see them are - Can I just hot swap the degraded drive with the new one and the data will automatically re-sync and we are all back to normal presumably this is dependant on the current raid configuration? reading various comments on-line I may need to re-configure the RAID array and re-build the broken drive? This screams disaster to me with the main worry being that I wipe any other data. Option 1 would of course make my day. Thanks in advance

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• GUI session from Mac to Linux, over WAN

  - by kellogs

  Closest thing I could find here was this I am on Mac OS 10.5.6 with X server installed. This is the machine I am trying to get GUI session data onto. There is an Ubuntu 11.10 Linux on which I have installed an X server and GDM. This is the machine where the GUI session data should come from. Currently, I got to the point where Linux listenes on port TCP 6000 for its clients. 1 - how do I swap port 6000 for port 6767 ? 2 - how do I connect to 6767 from my Mac ? Thanks

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• Long wait until POST...

  - by Wesley

  Here are the specs to put things into context: ECS P4VXASD2+ (V5.0) motherboard Intel Pentium 4 Northwood 2.8 GHz (512 KB L2, 533 MHz FSB) 2x 512 MB PC2100 DDR266 RAM 128 MB NVIDIA GeForce FX 5200 AGP WD Caviar SE 80 GB IDE HDD Gigabyte CD-RW drive OKIA 300W ATX PSU So, everytime I try to boot up this computer, it takes at least 10-15 seconds before it will POST. All my other machines will post within 1-2 seconds, but this one takes a particularly long time. I've read suggestions from a Google search to swap the CMOS battery, check BIOS settings, and double check CMOS jumper. Still after follow those, it takes a while to POST. What else could be causing a long delay before POSTing?

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• Installing Ubuntu next to Windows XP

  - by jess

  I have iso image for Ubuntu 11.0.4 on a CD. My OS is windows XP. I have 3 partions c, E and F. Windows is installed on C, and F has data. E is empty drive. Now, after I start installation , I choose the third option. Then click forward and I am shown three figures -- /dev/sda1 52427(total)/50931(used) /dev/sda5 52427(total)/3221(used) -- surprised, since it should be empty. I had used wubi to install earlier but have uninstalled. /dev/sda5 215206(total)/37545(used) Now, it means I need to choose sda5. Now how should I go about creating 3 partions for /(root), /home and /swap. Click edit partion and give size for each of them?

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• Any experience with SATA SAS Interposer Cards?

  - by korkman

  Driven by the current price difference between SATA and SAS disks on one side and the potentially bad behaviour of SATA disks in bigger storage arrays on the other side, I have found so-called SATA-to-SAS interposer cards. Advertised as "seamlessly adding SAS capabilities to existing SATA disk drives", I wonder if anyone here has had some experience with these or similar products. The major benefits I can identify are the increased cable voltage (if all drives are SAS connected), the ability to power-cycle the drive and multipath (if desired). Obviously the SATA drive will still have to be RAID edition. The question is: Do these cards indeed increase the overall reliability of a storage system, or will failing SATA disks cause trouble nevertheless? Edit: I'm not asking for hypothetical answers, only actual experience please. I'm well aware that the typical 10k SAS drive is more reliable (and better performing) than 7200 SATA drives. But how does a nearline SAS, which is phyiscally the same disk as its SATA counterpart, compare to the SATA version with interposer?

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• Command+Tab not working on MacOSX Client with Synergy

  - by dragonmantank

  I have an Ubuntu 11.10 laptop paired with an Apple Wireless Keyboard. I'm using the answer on this question to swap the Command and Option keys so that they are mapped like a regular keyboard. This works fine in Ubuntu. Now I have a Macbook Pro running as a Synergy Client. This mapping kind of works on the Macbook, but it only allows me to Command+Tab between two programs, not all of them. Copy, Paste, and other Command keys seem to work fine, but not Command+Tab. It's annoying just because I use the keyboard a lot. And yes, I could switch to syncing the keyboard and the Macbook, but I use the Ubuntu laptop more.

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• RS-232 vs. RS-485

  - by user60524

  Doing a little research on the two to figure out which one may better suit my purposes (communications amongst different hardware). How do they fare against one another? Im far from being a specialist and have no idea where I would even start looking for data to compare and contrast. If possible can someone please answer the following questions in regards to each of these. Can they be networked amongst each other? Can they be easily networked over ethernet? What speeds do they transfer at? (Min, Max, Etc.) Reliability? Best framework to build on top of to support the above? Any standard communications programs? Debugging capability? Any help would be very much appreciated, thanks.

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• "Cannot allocate memory" while no process seems to be using up memory

  - by omat

  I am not competent on server issues, any help is much appreciated. When try to start a python/django shell on a linux box, I am getting OSError: [Errno 12] Cannot allocate memory. free -m seems to confirm I am out of memory: total used free shared buffers cached Mem: 590 560 29 0 3 37 -/+ buffers/cache: 518 71 Swap: 0 0 0 But I cannot see what is eating up the memory with top or ps aux: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1 root 20 0 24336 908 0 S 0.0 0.2 0:00.68 init 2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd 3 root 20 0 0 0 0 S 0.0 0.0 0:04.85 ksoftirqd/0 How can I identify the leak? Thanks. BTW, I am not sure if it is relevant, but the machine I am talking about is an AWS EC2 instance with Ubuntu 12 running.

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• Microsoft Excel IF/THEN statement for Words

  - by user1667462

  Right now I have an excel spreadsheet. In Cells A1 and down I have cities listed. In Cells B1 and down I have some generic information with the word CITY in it. What I want to know if there is a formula to replace the word CITY that is in the contents of Cell B1 with the contents in Cell A1. For instance... Cell A1 has "Daytona Beach, FL" Cell B1 has "Compare mortgage & refinance rates from different mortgage lenders and brokers in CITY. Find the home refinance rate you were looking for in CITY." I need a formula that replaces "CITY" in B1 with "Dayton Beach, FL" in A1. Is this possible? Thank you for your help!

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• Likelihood of a hard drive PCB replacement working?

  - by Grant Limberg

  I have a 1.5TB Seagate 7200.11 that died. The platter still spins up initially when attached to a machine, but then the drive clicks and spins down. Then the cycle repeats. I've found a few sites that sell replacement PCBs, however I don't know if the PCB is the issue, or something else. Given the symptoms above, is it at all likely that a PCB replacement would help? If not, I won't waste my money on the PCB replacement. Note: I put the drive in an external ESATA controller and tried hooking it up to a Linux box here at work and got some error messages in the logs. I can post them if anyone thinks it will help in determining whether a PCB swap would fix the problem I'm running into.

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• Disabling default gestures in Scrybe

  - by RoboShop

  Just upgraded my touchpad drivers and it came with a Scrybe program which allows you to basically do some gesture and automatically load up a website or an application etc. Sounds like it could potentially be very useful. The only thing I don't really like about it is it comes preloaded with like all of these default gestures that take you to facebook, amazon, ebay etc. I'm sure they purposely put them there cause they get money for referels etc. but is there a way to turn them off? I would just like my own links in there. I just think that it takes probably about 2-3 seconds for a gesture to be recognized and that might be due largely to the fact that it's gotta compare it against all these default gestures. If I could somehow disable them, I'm sure it would work faster. Alternatively I'd be happy with a recommendation of a program similar to Scrybe but that works faster.

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• Free duplicate music finder for Mac.

  - by Jack M.

  I'm trying to clean up an mp3 folder which has a plethora of duplicate files in it due to accidentally dragging my music folder into iTunes and having it re-import songs which were already in the play list. I tried writing a quick Python app to md5 all of the files, and delete exact duplicates. This took out ~2gb of files. Unfortunately, however, this does not work on all of the duplicates because of an iTunes feature. iTunes has changed the ID3 title on some of the duplicate songs, which means the md5 of the entire file is different from the same song with a different ID3 tag. Are there any free applications out there (for the mac) which can compare the data of the actual song (ignoring ID3 tags) and determine if duplicates exist?

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• 2010 MBP HD speed sanity check?

  - by hvgotcodes

  I have a 2010 MBP with the 7200 rpm hard drive. I was copying a 2.1GB file, and noticed read/write speeds of around 20MB/s. Is that reasonable? Seems slow to me.... What is the proper way to benchmark a HD on OS X? Googling I see xbench, but that hasn't been updated in years. I also see some guides for using the command line. The goal would be to benchmark my drive and then compare the results to some official scores that the drive should be getting.

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• Choosing a Linux distribution

  - by Luke Puplett

  Dangerous territory with this question so please try to be impartial and instead focus on what to look for when choosing a Linux distribution. I'm completely new to Linux. I thought it'd never happen but I need to have a Linux box to play with and I have a spare fanless Atom PC (32-bit only). I'll be using the machine as a non-commercial hobby server, the trouble is, I don't even know how to compare Linux distributions and why people pick one over another. If anything, I want to have an easy install from USB stick. My question is: what do you look for when choosing a (free?) Linux distribution for a server? If you can, please explain what sorts of things actually differ between one and another without saying which you think is better, just the facts. The way I see it, Linux as a server is just an SSH console and I find it hard to imagine what could be different between one and another.

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• Ubuntu 10.10 and Windows 7 (TrueCrypt) Multi-boot Problems

  - by Samuel Taylor

  I have now been searching days for a solution but have found nothing. I have Ubuntu 10.10 and Windows 7 with TrueCrypt as a multi-boot. It was working fine for a few weeks until I needed to reinstall Ubuntu. If I have the boot flag on the partition where Windows 7 is install (This is where the boot flags was when working before.), it boots fine in to Windows 7 but when pressing Esc it can't find grub2. If I have the boot flag on the partition where Ubuntu is install, it boots fine in to Ubuntu (by pressing Esc or typing the password) but unable to access Windows. I have tried reinstalling TrueCrypt Boot loader and repairing the header but it have no affect. My Partitions: sda1 - Windows 7 Recovery (GRUB2) sda2 - Windows 7 (TrueCrypt Boot Loader) sda3 - Ubuntu 10.10 (/) sda4 - Extended sda5 - Swap sda6 - Ubuntu (/home) Does anyone have any ideas? Thanks Sam

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