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• Restricting server.log file size (minecraft) in CentOS

  - by MisdartedPenguin

  I'm currently running a bukkit (minecraft) server which generates a server.log file with all the console messages / errors. Every now and then I have a plugin (which i need) that crashes and can cause the server.log file size to increase dramatically. I've had it hit 32GB before which used all my disk space. Is there a way to make it a rolling log (deletes old errors) or be able to limit the file size so it can't go above say 10MB. But the solution needs to not affect how the server runs so it doesn't throw an error when it can't write anymore. Anyway of doing this with CentOS?

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• Best virtualization solution for running Linux under Mac OS X?

  - by grumbles

  I'd like to run a virtualized Ubuntu instance under Mac OS X (10.6). I've used VirtualBox in the past, but am looking for something that will be faster, and don't mind paying for either Parallels Desktop or VMWare Fusion. Does anyone have experience running Linux guests under either or both programs? I'm primarily interested in doing software development on the Linux guest installation, but I'm also very concerned with the performance and responsiveness the guest OS. I have a mid-2010 15" MacBook Pro (2.66 GHz i5, 8 GB of RAM, NVIDIDA GeForce GT 330M). Thanks!

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• How does a Promise FastTrak 133 interleave a striped array?

  - by Jemenake

  I co-worker had two drives configured as a stripe on a motherboard with an on-board Promise FastTrak 133. The motherboard failed, and we've been unable to find any others with an on-board Promise controller which can recognize the array. With Linux or some disk editors, I can see data on both drives... and I want to see if I can combine the data from both drives onto a single, larger drive. But I need to know how that information is interleaved on the drives. I've tried dmraid on Linux, but that doesn't recognize the drives as an array. I guess I could just try combining alternating blocks from the drives, starting with a block size of 256B and keep doubling until I get a result that looks intact. But I'd like to avoid that if someone already knows how Promise controllers spread the data over a striped array.

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• "Undeleting" partition (NTFS) - recommendations?

  - by kagali-san

  So I have a drive which either suffered from hardware error or, possibly, got a little shock from badly configured Windows unattended install started on the same PC (the drive in question wasn't the install drive..). Quick exam shows that filesystem is seemingly intact, as some data recovery tools work with it (UnFormat rated it as "Excellent"). This may mean that a copy of partition table exists on disk, or a copy of MFT survived whatever happened, or.. Any idea how to restore partition tables/FS header, add a drive letter thus let Windows to mount the filesystem as if nothing happened? (I guess there must be tools of this kind)

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• Windows 7 boot error 0xc0000225 after falling down

  - by Hulehule20

  My Toshiba netbook fell down and hasn't booted again. When I start Windows 7 it immediately says: Windows failed to start... Status: 0xc0000225 Info: The boot selection failed because a required device is inaccessible. After that, there are a few things to consider: There's a Linux distro Linkat which is also installed in the computer. It starts normally without any problem and it doesn't seem to display any errors when it boots. I restored all computer OSs with clonezilla and some images provided by the manufacturer, and it's done nothing. I have already checked the basic components of the PC (RAM, Hard Disk, WLAN Card) are pluged in and working. My impression is that's all about some broken part inside, though the Linux OS starts normally. Does anyone know a way I can fix this or at least any software for identifying the problem at all?

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• What is and what is not replicated in a glassfish cluster with a mod_jk load balancer?

  - by Navigateur

  I have a Glassfish (3.1.2) cluster over 2 computers as nodes, with a mod_jk load balancer. Are servlet instance variables replicated perfectly? If not, how do I make sure it is? Are all actions, including method calls and disk writes, replicated perfectly? If not, how do I make sure they are? These may seem like stupid questions, but I'm not seeking "load balancing" as much as I am seeking exact replication to enable future upgrading without any service interruption. How do I achieve this if it is not already the case?

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• When I try to install Windows 7 on dell inspiron 1420 which came with Ubuntu freezes at the beginnin

  - by draganstankovic

  I have searched many forums and tried a lot of suggested solutions but nothing works. I am sure that installation disk is ok cause it worked before (I was able to install Windows7 on my other notebook - MSI). What happens is: I boot with installation CD, it says 'Windows is loading files...' Then it says Starting Windows (mouse laser works at that moment). Then I get the screen with window which has a title "Install Windows" with options to choose language, keyboard, etc. and asking me to click next. But, the problem is that at that moment mouse and keyboard don't work at all. Mouse's laser is turned off, and if I press CAPS LOCK on keyboard it doesn't turn the LED on. Do you have any suggestions? Thanks!

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• How do I sync a subset of tables between two databases on the same mysql database server

  - by Mike

  would like to be able to sync a subset of tables between two mysql databases that are running on the same server. One of the databases acts as the master where inserts, updates and deletes can be made. The second database uses those same tables for read-only operations. I do not want to use federated tables to achieve this. The long term goal will be to separate the 2 databases to multiple servers, The second database that has the subset of tables as read-only may also be replicated a few times over to distribute geographically for load and performance purposes each with unqiue data.... Once that is achieved, I plan to use binlog to replicate those specific tables on the secondary databases. In the meantime, I'd like to keep these tables in sync. Is there a more elegant way to do this than other than using a cronjob and mysqldump?

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• Windows 7 won't recognize my second hard drive after reinstall

  - by Shadur

  I recently suffered a total hardware crash on my windows C: drive. Fortunately, I had a spare disk on hand and set about reinstalling. For some reason, during the install it decided to declare my second windows drive as the booting drive, but once the installation was completed it completely and utterly refuses to acknowledge the filesystem -- I'm not even seeing a drive letter, while it /does/ find the linux partitions on the other two drives (even if it can't read any of them). My first (and most important) question: How can I get windows to re-acknowledge the drive, preferably without losing all the data on it? My second question: How can I tell windows to set up its boot loader on the new C: drive?

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• Boot from Recovery partition in Sony Vaio Laptop with no imagex

  - by user302787

  I have visited more and more pages in internet and read lots of solutions but no one solved my problem. I have my 10 GB win7 recovery partition in my Hard Disk but when I press the F10 button it was not booted from this partition (I use this method to recover my laptop several times recently). So How can I boot from my recovery partition? I copied the partition into a flash drive and tried to boot from usb but it does not take effect. I think if there is a way to recover the F10 button functionality, I can recover my laptop.

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• repair window-xp - access denied for "document and settings" through command line

  - by Or A

  hi, i'm trying to repair my windows xp and it fails to reboot (bad sector or something). i'm using my dell recovery disk and then select the "Repair" option which takes me to the command line application when i can browse my files and folders (like with cmd.exe). however, when i'm trying to access the "Documents and settings" folder, it gives me access denied. is there any way to override it? is there any other way to access my documents and settings through other method? I'm just trying to recover some files and copy them to another drive on my computer and then reinstall my winxp. Thanks for the help

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• Using windows 7 and fedora

  - by vedant1811

  I need to partition my hard disk for windows and fedora (root, swap, users). I thought of creating 3 (primary drives). 2 small ones (~5GB) each for win7 and fedora and a large (~700GB) for common files (pictures, vidoes, documents, etc.) one. Please Tell me which file systems to use in each case and the set-up of primary and extended partitions. Also I want to know, where and on which file system should the Linux Grub (my choice of OS chooser) be installed. I have just a bought a new Asus K53S and using the Fedora Installer Partitioner (Anaconda). Your help is greatly appreciated.

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• What components should I upgrade to squeeze more life of my pc? [on hold]

  - by Jared

  Hi my current specs are CPU: Intel Core i5 750 2.66 GHz, Socket 1156 Motherboard: Asus P7P55 LX Motherboard, Socket 1156, 4xDIMM DDR3, 2xPCIe-16, 3xPCI, 2xPCIe-1, 14xUSB2, Audio, 1xATA, 6xSATA, RAID, ATX HDD: Seagate Barracuda 7200.11 ST31500341AS Hard Disk Drive, 1500GB, 7200rpm, 32MB Cache, SATA-2 RAM: G.Skill Ripjaw F3-12800CL8D-4GBRM, 2x2GB, DDR3-1600, PC3-12800, CL8, DIMM Video: MSI Radeon 5850 R5850-PM2D1G Video Card, 1024MB, DDR5, PCIe-16, DVI, CrossFire, HDMI PSU: Vantec ION2, 620W ATX PSU, SLI Ready, Black Firstly I know it badly needs an SSD, for which I'm thinking of the Samsung 250gb 840 EVO series. The ram could do with another 4GB, for which I am thinking of replacing the 2x2GB for 2x4GB of the same type. My video card is struggling with the latest releases, so vitally should I ditch the video card and go for something newer (ATI 7850, GTX 660?) or try and get another 5850 for crossfire support? Bearing in mind 5850's are sort of hard to come buy now as they are not stocked in shops usually, which means they have to be bought second hand.

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• non-mapped virtual memory & total number of connections

  - by tszming

  We have two MongoDB data nodes (replica set) - Primary & Secondary. I noticed that the non-mapped virtual memory is relatively high and wondering if they are hurting our MongoDB performance (The server usually peaked at around 6-7K queries per sec). In MMS, it was stated: "The most common case of usage of a high amount of memory for non-mapped is that there are very many connections to the database." So we checked the memory usage with db.serverStatus().mem in our Secondary: { "bits" : 64, "resident" : 6846, "virtual" : 416797, "supported" : true, "mapped" : 205549, "mappedWithJournal" : 411098, "note" : "virtual minus mapped is large. could indicate a memory leak" } Note: We are using 2.0.4 and now the default stack size should be 1MB per connection. The current number of connections is around 1.1K, but the non-mapped virtual memory (virtual-mappedWithJournal) is around 5699 MB. The trend is quite stable so I can't say there is a leak here, but where is the memory gone? Any idea?

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• can power supply affect I/O

  - by user101289

  I have a dev server machine running Ubuntu 12.04. For a long while it's been throwing intermittent errors where it would suddenly tell me "File system is read only" or drop into a GRUB error console on boot. I've done disk checks, bad blocks, etc. and no real problems with the main SATA drive were detected. Finally the drive would not be detected at all-- but neither would other drives I plugged in (via SATA). I plugged the supposedly "bad" drive into another server and it worked fine, no issues, for days-- so I assumed the motherboard had a bad SATA controller, and replaced the motherboard with an identical model. I replaced the drive into the original machine with the new motherboard, rebooted-- and the same issues-- I/O errors, failure to read the drive at all, dropping into GRUB, etc. I'm wondering if there could be some other issue with this machine, that's not related to the drive-- possibly power supply? Thanks for ideas

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• Long term system health monitor

  - by user30336

  As an experienced user, I sometimes notice that things are not going well with my computer. For example, my backup drive recently started cycling up and down, so I guessed it was probably dying, and replaced it. I detected this with my ears. Windows did not seem to notice or care. There ought to be software that monitors overall system health by keeping track of things like this, so that unusual events or increasing error rates will not be shrugged off. Among other things: disk errors that are recovered, corrupt network packets (at above the baseline expected rate) and crashes of trusted programs are early warnings. Is there any software that tries to use this kind of monitoring to warn of impending trouble?

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• New Kingson SSD drive fails after 1 week

  - by user35356

  I upgraded the hard disk in my notebook to a 128GB Kingston SSD V100. Everything worked fine for about a week then out of the blue the notebook would not boot up any more. A black dos-like screen was shown with the options to try and boot normally or attempt to repair windows. Neither option would do anything. When I removed the drive and tested it in an external usb case no other computers are able to access the drive either. Is there anything I can try to fix it myself? The drive is partitioned into three drives and when it's connected through an external usb case to another computer I can see the partitions, just can't access anything on them. Does this mean the drive might be recoverable?

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• Which UPS, for home use, which can automatically shutdown the PC when battery is low?

  - by Tony_Henrich

  I am planning to build a single server machine which is highly dependent on data residing in RAM for performance reasons. I am looking for a UPS which can power the PC during a blackout (very rare) and when the battery level is like %20, it sends a signal to Windows 2008 to shutdown. Even if it's only for a few minutes, that's good enough. This is for home use so I am looking for an inexpensive unit ( less than $300? ). Which brand/model is good choice? I prefer one whose battery is easily & cheaply replaced.

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• How to recover logical volume deleted with lvremove

  - by John P

  I am on CentOS 5.5 and am running Xen. I have a large volume group that I create logical volumes on using lvcreate. Today I had a customer cancel her account, then change her mind about an hour later. Unfortunately I had already removed the LVM her Xen image resided on. (just using a standard lvremove ). There has been no other LVM activity on this disk since then (nothing else added or deleted). Is it possible to "undo" a lvremove, or recover logical volume? If so, how would I go about it?

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• Can't use VHD in a particular machine

  - by madth3

  (All the machines referred below have Windows 7 Professional.) I have a virtual machine targetted for Virtual PC. I'm able to use that disk in two different machines (32 bit and 64 bit, respectively). Yet in the machine where I wanted to finally install this virtual machine I get the error that the VHD file is not valid. The faulty machine is 32 bit and has the exact same Virtual PC version as the other machines. The file was correctly copied (SHA1sum says so). Default XP Mode works (therefore Virtual PC is not so wrong) Does anyone have any idea what might be wrong in the target machine?

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• Can I move files from a laptop hard drive with a corrupt sector to a USB hard drive?

  - by Corey

  I have a hard drive that is on its way out and won't boot to Windows 7. The Windows partition takes up the whole disk. I thought I would try to recover some recent files that hadn't been backed up. Assuming the files are recoverable, how can I explore the drive that has the corrupt sector and transfer files to a USB hard drive? If it helps, the laptop is able to see the USB drive when choosing a boot order. Some searching lead me to WinPE 3.0, part of the Windows Automated Install Kit. Is that a method?

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• Can You Specify Where LVM Snapshots Are (Initially) Stored?

  - by bottles

  Disclaimer: this is my first time using lvm. Upon RTFM, it appears that LVM snapshots are automatically stored in the same directory as the original logical volume. In my case, that would mean the /dev directory. This isn't very nice, because there's not enough disk space in there for me to store a large snapshot. So when I run a command like lvcreate --size 1G --snapshot --name snapshot /dev/lvmData/usr, I need an additional 1G of space free in /dev? Is there any way to specify a different directory in which to store my snapshot?

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• IPSec 2 hosts (preshared key) - network shares very slow

  - by LxFlip

  I'm testing a IPSec config between 2 hosts, using ipsec auth with preshared key, very simple configuration. (I want to start with a IPSec simple preshared key config, and then step up to a Certificate or kerberos...) The problem is: The connection is working but when accessing network file shares the first time it's very slow. On the same host i'm testing the shares, i have an IIS site running, and the performance seems very normal, fast. Does anybody know why does SMB shares are soo slow? Is there any ipsec policy options that should be tweaked? Thanks

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• What do desktop users use SSD for? [closed]

  - by Continuation

  I keep hearing people say how much faster their desktops/laptops are after switching to SSD. But then when I ask them what do they use SSD for, the answers are always "booting". Not trying to start a flame war here. I use SSD for my database server and it makes a huge difference. A single SSD can replace a 10 drives RAID 10 and is actually both much faster and MUCH CHEAPER. But I just can't think of a usecase for desktops where SSD could make a similar impact. Sure it's kinda nice to cut boot time down from 40 seconds to 10 seconds. But is it that big a deal? Would love to hear how SSD improves your desktop performance.

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• permanently mount multiple directories from different disks under root [on hold]

  - by piotrek

  I have SSD and HDD. Some directories like /var /srv /tmp should be on hdd while /boot /usr /lib on ssd. But do I have to create separate partition for every single directory? i want to have 2 or so partitions. one for each disk and distribute directories as needed. is it possible? and how? i've heard about symlinks, mount --bind, mhddfs but: symlinks are treated differently by tools like cp so i'm not sure if it's safe to have main system directories symlinked i have no idea how can I use mount --bind or mhddfs in fstab

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