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• How do I lower idle cpu usage in ubuntu linux? Gnome or KDE Variants

  - by Jasen

  My question comes from a kde desktop currently, but it also happens with the gnome instance. When just sitting there, with only the cpu monitor widget running. no open windows, no background processes other than the desktop, my cpu is at ~20%. I wanna know how to fix this, and possibly get better performance out of it. When running my windows side, the cpu will sit at zero, and i generally load new programs about 400ms faster. With windows 7 being as slow as it is, this is not acceptable. and the widget is only set to check every 500ms, so im almost completely sure its not the widget. My system is a Gateway nv 53 amd 2.0 ghz turion with 4 gb of installed ram, and 500 gb hd. both linux and windows are 64 bit. average ram use on either system is about 1.4 gb for just the os

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• Do I need to retain Sharepoint usage analysis log files

  - by dunxd

  Our Sharepoint installation currently has 30Gb of Usage Analysis Log file - these date back about six months. I have configured Sharepoint to do Usage Analysis Processing every night, so I am wondering whether I need to keep these files for so long. Sharepoint doesn't seem to clean up these files automatically - I think six months ago I had to clear out logs due to disk space issues. So my question is, do I need to retain these files in order to get decent usage analysis reports, or can I delete them as soon as the usage analysis processing has completed?

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• How do I unmount a charging device in Linux?

  - by PeanutsMonkey

  I have a mobile device attached via USB to a Linux box and wish to unmount it. I ran the command fdisk -l however it does not list a mount point. I then ran the command lsusb which yielded the screenshot below. I then proceeded to search the /dev/disk/by-id directory and was found the following file The file is a symbolic link to what appears to be /dev/sdc Questions Why does it not appear when I run the command fdisk -l? How do I unmount it properly without simply yanking the USB cord from the USB port?

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• Cloud based backup solutions based on open standards?

  - by Rick

  I am looking for a solution to backup and consolidate important media from a couple Windows laptops and Mac laptop. I would like a solutions that based on open standards, so my data isn't trapped by proprietary formats and proprietary protocols. I would like the ability to switch clients or change providers in the future. For example, something like Jungle Disk plus S3 sounds like a great option. However, I am having trouble confirming how or if this can be setup meeting this criteria. Are there any real or de-facto standards for treating S3 as a filesystem? If so, what Windows and Mac clients support these standards?

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• How can I diagnose cache misses when using Apache as a reverse proxy?

  - by johnstok

  I have set up Apache 2.2 as a reverse proxy with the following configuration: # jBoss proxying ProxyRequests Off <Proxy *> Order deny,allow Allow from all </Proxy> ProxyPass /foo http://localhost:9080/foo ProxyPassReverse /foo http://localhost:9080/foo ProxyPassReverseCookiePath /foo /foo # Reverse proxy caching CacheEnable disk /foo # Compression SetOutputFilter DEFLATE BrowserMatch ^Mozilla/4 gzip-only-text/html BrowserMatch ^Mozilla/4\.0[678] no-gzip BrowserMatch \bMSIE\s(7|8) !no-gzip !gzip-only-text/html DeflateCompressionLevel 9 Header append Vary User-Agent env=!dont-vary However, in a number of cases where I expect a cached response to be returned the request is sent through to the origin server at localhost:9080. Responses have a HTTP Vary header of 'Accept-Encoding,User-Agent' which is to be expected given the mod_deflate configuration. How can I determine why Apache is unable to serve a response from the cache?

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• How to check if redis master is OK?

  - by e-satis

  On the documentation, they advice the monitor command. But it has a 50% performance penalty for the whole system, and how should I do that ? Whatching the ouput using SSH until I don't see anything ? Let's say I have 3 servers: 1 with a redis master, 1 with a redis slave, and one with my website querying the redis master. How can I, from my website server, make cleany the decision to fallback to the slave by sending the SLAVEOF NO ONE command ? My first step would be to put some kind of timeout check with a simple ping, just to be sure the server is online. But for redis specifically, I have no clue.

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• Create a Windows 7 System Repair ISO?

  - by MaDMaD Mad

  According to the Microsoft website I can run "Create a system repair disc" from the start menu to burn a recovery Disc. However, there are many situations (including not having a disk drive) where this cannot be done. My goal is to create a bootable USB drive according to this guide but their method to do so without burning a physical disc includes downloading an ISO from "somebody's" website. I don't know who "somebody" is and I feel it is reasonable to not boot something I can't verify as being untampered with. To the best of my knowledge, Microsoft does not host a recovery disc ISO for download as this would be the easiest solution. So my problem is that I'd like to circumvent Microsofts "burn to disc" option with a "burn to ISO" through any reasonable means.

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• cygwin rsync over ssh very slow

  - by Waleed Hamra

  I have 2 machines running Windows Xp SP3. I have cygwin installed on both, version 1.7. I have rsync and ssh installed on both, and configured using default settings as per ssh-host-config and ssh-user-config programs provided. I moved the public keys into their respective locations, and basically ssh is working fine. i began an rsync operation, using: rsync -av --delete --hard-links local_dir username@other_machine:/some_dir well... on both machines, the processor is running near idle, no heavy usage. I checked IO using process explorer on both machines, and that too is at normal levels (1~2 MB/s), so I can't see where the bottlenecks are, because network performance is aweful. I'm not going over 1MB/s... when a normal file copy using windows sharing achieves some ~10 MB/s.. What could be wrong?

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• information about /proc/pid/sched

  - by redeye

  Not sure this is the right place for this question, but here goes: I'm trying to make some sense of the /proc/pid/sched and /proc/pid/task/tid/sched files for a highly threaded server process, however I was not able to find a good explanation of how to interpret this file ( just a few bits here: http://knol.google.com/k/linux-performance-tuning-and-measurement# ) . I assume this entry in procfs is related to newer versions of the kernel that run with the CFS scheduler? CentOS distro running on a 2.6.24.7-149.el5rt kernel version with preempt rt patch. Any thoughts?

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• Why do I have only incoming traffic when copying from network source to network destination?

  - by mxp

  I have a VirtualBox VM that is located on a network share of my NAS. When I copy something from the VM's disk onto another of the NAS' network shares (so the data is visible outside the VM), the Windows 7 Task Manager shows only incoming network traffic (yellow graph). It's as if the data was only received but never sent over the network. I verified that the data arrives on the other network share. As I understand it, the data flow looks like this: +-NAS--------+ +-Win7 PC (VM Host)-+ | Share1(VM)-|>---->|-+ | | | | | | | Share2 <---|<----<|-+ | +------------+ +-------------------+ If it was like this, I would see incoming and outgoing traffic, right? What am I not getting here?

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• Raid on ICH9R chip set

  - by user500982

  Hi Im looking at buyign this MB: http://www.supermicro.com/products/motherboard/ATOM/ICH9/X7SPE-HF-D525.cfm Im wondering though if the chipset will support the raid configuration I need. Im looking to configure the following arrays: raid array 1: 2 2TB Disks in Raid 0 raid array 2: 2 2TB Disks in Raid 0 raid array 3 (not actualy an array): 1 300GB Disk not in raid, to be used for OS and boot. So in total there would be 5 drives and the board supports 6. so im good when it comes to connections. However I have herd some chip sets only support one raid array (volume). so either all drives are individual, or are in the array. I must have 2 sperate raid arrays independent of each other, and a 5th drive not in any array. Anybody know if this setup will work? Thanks, -Stewart

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• Resilient Linux Mail Server Setup

  - by Coops

  How would people design a resilient mail server setup with Linux? On an application level what the system needs to provide is both an incoming and outgoing mail service (i.e. SMTP & IMAP), along with filtering and archive storage (the archive part isn't critical yet, so we'll look at this later probably). What is required on top of this is a resilient system, i.e. one which will handle individual server failures without interrupting service. As such I would term this a High Availability mail system. This is in contrast to a High Performance mail setup, as in our case the volume of mail being handled isn't the important factor, it's simply that it stays online. Having not approached this problem before, the first thing I thought of was a clustered file system (gfs/gluster/etc), combined with heartbeat to failover a floating IP to another box in the case of a server failure. Combined with postfix & dovecot does this sound feasible to people?

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• What kind of CPU/GPU integration is offered by APUs?

  - by clabacchio

  I'm truly fascinated by the idea of GPGPU and using the GPU for heavy processing. I'm seeing that also APUs (Accelerated Processing Units, CPU+GPU on the same chip) are gaining a consistent popularity. Are all of the APUs using a GPGPU? Can it be used for processing? And is it seamless or it requires special code (like Cuda) to have the hard work made by the GPU? I'm not interested in bare graphic performance, but more about how much the GPU can accelerate the "normal" CPU work.

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• Computer Locks Up Completely When Resuming From Standby

  - by kcoppock

  Okay, so I'm having a strange issue lately with my desktop, and off the top of my head I'm not sure what the problem is, so I'm hoping for some ideas on how to track down the cause. First, my PC: AMD Phenom 9600 Quad-Core 2.4 GHz 4 GB DDR2 160 GB boot HDD 1 TB & 120 GB secondary HDD Nvidia GeForce 8600 GTS Windows 7 Professional 64-bit I have my power settings as follows: Turn off the display: 10 minutes Turn off hard disk: 20 minutes Sleep after: Never After a while, I'll come back to use my computer again, wiggle the mouse, and the screen comes back on like normal, but the desktop is unresponsive. I can move the cursor, but nothing responds to clicks or keyboard entry. If I click a few times with the mouse, the computer eventually locks up completely and the mouse cursor stops moving as well. After I restart, everything works just fine. Is there a log you recommend checking or really any suggestions would be welcome at this point. Thanks!

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• Ubuntu: One or more of the mounts listed in fstab cannot ye be mounted

  - by Phuong Nguyen

  I was enjoying a Movie when my Ubuntu suddenly hung. At the next reboot, here is the message: One or more of the mounts listed in /etc/fstab cannot yet be mounted: /home: waiting for /dev/disk/by-uuid/.... Press ESC to enter a recovery shell. Problems: When I enter recovery shell, I don't know that to do. If I press Ctrl+D, then the message above will reappear. What should I do? I checked with Ubuntu Live CD and my partition looks OK.

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• How to efficiently dump a huge MySQL innodb database?

  - by Jagbir

  I got an Ubuntu 10.04 production MySQL database server where total size of database is 260 GB while size of root partition is itself 300 GB where DB is stored, essentially means around 96% of / is full and there's no space left for storing dump/backup etc. No other disk is attached to server as of now. My task is to migrate this database to other server sitting in different datacenter. Question is how to do that efficiently with minimum downtime? I'm thinking in line of: Request to attach an extra drive to server and take a dump in that drive. Transfer dump to new server, restore it and make new server slave of existing one to keep data in sync When migration is needed, break replication, update slave config to accept read/write requests and make old server read-only so it won't entertain any write requests and tell app developers to update there config with new IP address for db. What's your suggestions to improve this or any alternate better approach for this task?

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• How to resize root LVM partition in Fedora without LiveCD or Rebooting

  - by Cerin

  I have a virtual machine that recently had its disk image increased from 20GB to 50GB, and fdisk -l verifies that the VM can see this new size. Now I need to resize my root LVM partition to fill the extra 30GB. I've found several articles about resizing LVM, but the few that cover resizing the root partition all claim you need to boot from a LiveCD. Is there any way to do this without taking down the server? The server is critical, so I'd like to minimize downtime.

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• mounting vsphere 4.0 file system in ubuntu linux

  - by sravan

  hi all, I am using VSpere 4.0 for my project work. I needed 4-5 servers my project work which is based on Database. I felt the virtualisation is very good to get the 5 servers running good at the same time. It was running good until few days back. Yesterday, it suddenly crashed and i had no idea of the reason.Today, it did not even boot up. Now, i need to take the data backup from that system. In order to do the same, i got the hard drive from the machine and tried to mount it on local linux machine.But, i was not successful. The disk was not even recognized by the linux machine. Can some one please tell me how to mount it and get the required data? Thank you all

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• Intermittent USB 3.0 access - How do I troubleshoot?

  - by Billy ONeal

  I've got a WD Passport hard disk with "superspeed" USB 3.0 support. When I use my USB 3.0 flash drive (this is a Lenovo X220 laptop), USB 3.0 consistently works. But when I use the passport drive, almost without fail the connection drops to USB 2.0. Touching the cable seems to immediately trigger the problem, but it seems to happen on its own though. I've got another cable on order right now... but is it likely the cable's the issue here? Is there anything else I can check?

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• Feeding the kernels entropy source from other machines and/or increasing its maximum size

  - by David Spillett

  We have has a little trouble with a small box that acts as a VPN end-point and mail relay for our network, caused by the available entropy for /dev/random being too low (which causes TLS connection attempts by exim to fail). The machine doesn't do anything else, so the normal feed into the entropy pool (interrupt timings from things like disk access) is not enough. As a quick hack I've set a looping script that reads from /dev/hda at a couple of Mbyte/sec which keeps it topped up. Other than buying a hardware RNG, is there a clean way of piping data for entry from elsewhere, such as a copy of the data our file server uses for its entropy source? I've spotted several tips for using rng-tools to feed it from /dev/urandom on the same machine but that "feels dirty". Also, is it possible to increase the maximum pool size? It currently seems to max out at 3585.

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• Text template or tool for documentation of computer configurations

  - by mjustin

  I regularly write and update technical documentation which will be used to set up a new virtual machine, or to have a lookup for system dependencies in networks with around 20-50 (server-side) computers. At the moment I use OpenOffice Writer with text tables, and create one document per intranet domain. To improve this documentation, I would like to collect some examples to identify areas where my documents can be improved, regarding general structure and content, to make it easy to read and use not only for me but also for technical staff, helpdesk etc. Are there simple text templates (for example for OpenOffice Writer) or tools (maybe database-driven) for structured documentation of a computer configuration? Such a template / tool should provide required and optional configuration sections, like 'operating system', 'installed services', 'mapped network drives', 'scheduled tasks', 'remote servers', 'logon user account', 'firewall settings', 'hard disk size' ... It is not so much low-level hardware docs but more infrastructure / integration information in these documents (no BIOS settings, MAC addresses).

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• How long do uploaded files stay in the tmp folder in Linux Ubuntu?

  - by Jean-Nicolas Boulay Desjardins

  I am building a web application where my users will be able to upload files. After the files are uploaded I need to send the files to two other servers, and after they will be deleted from the server where they were just uploaded to. I am wandering is it a good I idea to keep the uploaded files in the tmp/ folder the time the uploaded files are sent to the other two servers or should I move them to another folder incase they get deleted? I am also wandering because I would like to know if I have to build a cron script to get rid of the files that have been transfered to the other servers so that I get my disk space back.

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• How can I compare effective power usage of two CPUs / CPU+Mobo+Mem combinations?

  - by einpoklum

  I have this server which does mostly file sharing (with the associated storage). No serious number crunching and it isn't the firewall. My current box has a Celeron D processor (Prescott 336 2.8 GHz); and I'm considering replacing it with a Pentium D (Smithfield 805 2.66 GHz) - for reasons which do not involve performance. How can I know whether one can expect a higher or lower power consumptipn for the change? And how can I estimate the power consumption for each option?

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• How to check if a server runs in pressing mode

  - by Ice

  Hi there, Layout: i have at customer side a server (win2003 R2 SP2 standard edition 32-bit) with a sql-server 2005 and some databases. This system starts with the /3GB-Switch. The system reports 3.25 GB RAM and taskmanager reports the process of sqlserver.exe with 2758255 K as the process with the highest consumption. The OS separates RAM for applications and for itself, normaly 50:50. But here we have the /3GB-Switch aktivated and i think the part for the applications is more than 50% of RAM. Knowledge (or better not knowledge): Somebody told me that if the OS runs out of memory within his part of RAM, the server runs into pressing mode. Questions: What is this pressing mode? Is pressing mode possible at all in this szenario? What should be done to get more performance out of this sql-server, beside optimizing the database and all this stuff.

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• Intel hybrid graphics stuck in power save mode

  - by OZZIE

  I have an Asus UL30V with Intel hybrid graphics. When I bought it it used to switch to turn of the better graphics card to save power and run on a more power effecient one. When I connected the laptop to a power source again I could go to the intel graphics icon on the task bar and click on "switch to enhanced performance mode" or something similar. But like 2-3 months ago it suddenly vanished. I cannot switch modes anymore, it's gotten stuck in power save mode. I can change the windows power setting but that doesn't enable the better graphics card :( What should I do? I've tried restarting the computer and that does not work. I really hope I don't have to reinstall the drivers! It seems like other people have had the same issue: http://en.community.dell.com/support-forums/laptop/f/3518/p/19422695/19994601.aspx , he hasn't even got the same computer as me. I have windows 7 Home Premium x64 Any ideas?

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