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• What service can hold CPU at lowest frequency possible when on battery load under Ubuntu?

  - by vava

  When I'm running on battery even with "performance" frequency scaling governor, something regularly lowers CPU speed to it's lowest value. I don't really want that, my AC strip usually in another room so I don't really need to save power. How can I find what service doing that? laptop_mode is disabled so that's not it. Update: Looks like CPU being scaled down only if it is under load. If it is more or less idle, it could stay on any frequency pretty much forever, but once it gets loaded, it quickly jumps to it's lowest frequency. Another update: Something sets maximum frequency CPU can have. Ubuntu launchpad bug 242006

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• ZFS, dedupe and PST files

  - by Unreason

  I am interested to know what would be expected maximum dedupe ratio for a set of PST files. I have ~40G of pst files from ~15 usres with high level of duplication of attachments. I am running tests to see if I can have significant space savings if I store the data on ZFS with dedupe. For this purpose I have installed a test setup of Nexenta, but was wondering if someone here had already done this and what level of deduplication I might expect (or in another words how sensitive are pst files to block alignment and what are the parameters that can influence the ratio?). Initial test show very low dedupe ratio and I did find explanation that block level dedupe would not be efficient here and that byte level dedupe would be much better (and that it should be performed by application that is aware of internal organization), so I am just double checking here if someone have some more input. Otherwise I will probably be converting PST files to IMAP.

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• Streaming audio to headless linux box

  - by Ralph

  I have a dual boot (Win 7 + Ubuntu) PC connected via wifi with my music collection on a local HDD. I usually use Rhythmbox on Ubuntu or Winamp on Windows to listen to my music but I'll change if I have to. I also have a Raspberry Pi (low power PC running Debian) in the living room that is usually headless and connected via ethernet. The Raspberry Pi is also connected to my living room speakers via an amp. I would like to be able to stream music from my PC over the network to the linux raspberry pi. What software can I use to do this? Some sort of audio client\server?

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• One bigger Virtual Machine distributed across many Nodes [on hold]

  - by flyer

  I just setup virtual machines on one hardware with Vagrant (this is just a test environment, not production!). I want to use a Puppet to configure them and next try to setup OpenStack. I am not sure If I am understanding how this should look at the end. Is it possible to have below architecture with OpenStack after all where I will run one Virtual Machine with Linux? ------------------------------- | VM | ------------------------------- | NOVA | NOVA | NOVA | ------------------------------- | OpenStack | ------------------------------- | Node | Node | Node | ------------------------------- (In my environment Nodes are just virtual machines, but my question concerns separate Hardware nodes) After some comments... Is it a language barrier, or? This is only my 'virtual environment'. If we imagine this virtual machines are a separate Nodes (e.g. every has 4 cores) the OpenStack is still the same, right? Can I run one Virtual Machine across many Nodes with OpenStack? Is it possible to aggregate the computation power of separate machines in one virtual distributed operating system?

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• rsync server side limit bandwidth/connection

  - by c2h2

  In a VOIP application, I have upto 3000 clients rsync audio files from there linux server in a daily, server is placed at a data center (10Mbps in/out bound), the server works as a VOIP sip server running FreeSWITCH (low ping latency should be ensured.) Therefore I would like to have server side control of rsync which controls: Limit total outbound bandwidth. Limit total number of connections. (Reject clients while at max number of connection and let it retry after a specific time frame.) OPTIONAL: list/kill individual connections. Normally I would use ssh + rsync + pem_keys with some extra options, but above requirements are not feasible by simple command lines. Can anyone point me some direction. or show some scripts/tools? I would also probably integrate them and release on github. Thanks!

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• How can I disrupt my roommate's BitTorrent?

  - by bob

  We're on a 50 mb/s Comcast connection and our connection right now is coming in under 1.5 mb/s. Our roommate left for a week with BitTorrent running (Azureus client, we think). Our latency is approaching 300 ms. His door is locked up tight, and both his machine and the router for the house are located inside. I've even flipped the power breaker in the house and that barely works for 2 minutes. His laptop keeps on running, and once the cable modem and router come back up and the machine reconnects, the torrents resume in earnest. I've been running nmap and identified his IP on our LAN. Is there anything I can do over the LAN to make his torrents start to fail or slow down?

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• How do you explain ethernet cable problems to non networking people?

  - by Bryan McLemore

  We've recently been doing a large network migration in our datacenter. We've had a few cables in this start to deliver really bad pings (in excess of 500ms on a LAN) before they could be replaced. The cables we were replacing weren't made the best. They where all hand made and the runs were so short on some of them that the bend radius was definitely too tight. Some of them ran in bundles right in front of the heat exhaust of the power supplies. The cables were running ok until we started pulling the ones surrounding them out. Then a few started having the problem I mentioned above degrading performance and causing reliability issues. I'm trying to figure out the best way to explain this to non networking people. Is there any documentation that people could recommend or other methods?

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• Standalone server setup for compute capacity

  - by mikera

  I'm developing an application for my company that will require a lot of compute capacity (running some very big mathematical calculations), and looking for some form of server setup to do this. For various reasons, we want to run this on-site in our office rather than hosting it externally. It's been a while since I last had to set up my own servers so I thought I would tap into the collective wisdom of serverfault! My broad requirements are: Budget $30-50k, with an aim to get as much compute capacity as possible for that budget 64-bit servers suitable to run Ubuntu Linux + Java Some relatively standalone rack that can be installed in secure office space Fast/low latency network connections between the servers, but don't really care about connectivity to the outside world Storage capacity shared between the servers - they don't necessarily need their own storage providing they can be booted from a common image Downtime can be tolerated (since the calculations are run in batch mode) The software itself is fault-tolerant, so there is no need for extra resiliency in the server setup (cheap replaceable commodity parts will be fine in general) Given these requirements what kind of setup would you recommend and why?

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• Need solutions in sharing a 3Mb/768Kbps DSL line to 60+ users and faster bandwidth

  - by elistp

  Two parts. Part 1: We currently have 2 DSL Lines with 3Mb/768Kbps speeds load balanced for 60+ users. Accessing the Internet is borderline unusable. The simple solution would be to get a faster DSL Line but the highest DSL package is 6Mb/768Kbps, has quite the price jump, and doesn't do anything to help with upload speeds. I'm looking for free or extremely low cost solutions (web cache, traffic shaping, bandwidth controls, etc) to help with making Internet access more bearable until the next funding year. Can anyone give any advice? Part 2: We're looking into a 4.5Mb bonded T1 in the next funding year which is of course significantly more expensive than 2 DSL lines. Are bonded T1s our only hope for faster speeds? Are there any better alternatives?

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• Issue with broken disk on Solaris with raidctl - how to proceed

  - by weismat

  I have a SunFire T2000 server which has 2 mirrored disks pairs. The server required an exchange of the system battery. After swaping the battery first no disks were found. After booting from CD we managed to find the disks, but now one disk is broken and the raidctl reports a failed synchronisation. The boot process stops now when trying to mount the file systems. The power light of the broken drive is not even blinking. What is the best way to proceed now ? Fortunately I could live with loosing the data on the drive as it is backed up, but I would like to keep the rest of the data as it contains /etc and get the server booting again.

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• HAProxy being killed with more that 54,000 connections

  - by Olly

  I am trying to run HAProxy (1.4.8) on a EC2 machine running Ubuntu 10.04. I need HAProxy to be able to handle many thousands of long-running persistent connections (websockets). With the current setup HAProxy gets killed at around 54,300 connections (roughly). If I am running HAProxy in the foreground, the only output is "Killed". Am I right in thinking this is the Kernel killing the process? Is this because it is out of resources? Can I increase the resources? The CPU and memory consumption are low with 50,000 connections, so I don't suspect either of these. How can I prevent this from happening?

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• How can I access my mini-pc (RaspberryPi / MK802 / Mele A1000 / VIA APC) via ethernet/wifi without having Monitor?

  - by sky770

  Soon I will be getting my own mini-PC (RaspberryPi / MK802 / Mele A1000 / VIA APC). But I was wondering whether is there any possibility that I can just power up and access my mini-pc's OS by connecting it to wifi/ethernet link and remotely access it over the LAN without actually needing a monitor (throughout the process?) ? I currently own a laptop and need a download box and later will be getting a HDTV for converting to a HTPC :D So, I don't really own a spare monitor now but I do have an extra keyboard and mouse. Is there exists any linux distro for the same? which I can use to directly fireup my mini-pc and hook it up across my LAN to remotely access through my laptop? Any suggestions appreciated :) Regards, sky770

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• Debian crashed, file system is read-only and cannot backup - How Do I find/mount a USB drive?

  - by Spiros

  We have a Debian server (vm's) here at work and the server crashed after a power failure. I can only boot the system in maintenance mode, and the whole file system is set to read only. I can run fsck though maintenance mode, however I would like to get a backup of some files before I do. Problem: I cannot access the net since there is no network connectivity in maintenance mode, and for some reason I try to add a USB flash drive to the computer but I can't find it through the console. Question: how to you find/mount a usb drive on Debian? I have tried several resources from the internet but nothing worked. Is there any other way I could get a backup of my files? I cannot start networking since the filesystem is set to read only. Any help would be appreciated.

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• Black screen after scheduled resume from sleep

  - by macbirdie

  I have a problem with my two Windows 7 setups at home. Whenever a scheduled task wakes up the machines from sleep, a black screen with a mouse cursor appears. If I move the mouse or press any key, desktop appears. The biggest problem is that during that black screen phase the display, sometimes even the PC too, doesn't go to stand by after a set period of time in power settings. If I get the desktop to show up, standby functions work fine. Display goes blank after a few minutes and as soon as the task doesn't need the PC, it goes back to sleep. It's frustrating that this "feature" is wasting energy and keeps lighting up the pc in the middle of the night for me to find it that way after I wake up. I found a handful of threads on the intertubes about the issue, but there were no answers in any of them. It sometimes happens in my XP machine at work as well.

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• Can I fine-tune my screen brightness? (Ubuntu Studio, Thinkpad T420s)

  - by Dan S

  I am in a similar situation as question Can I fine-tune my screen brightness? . For me, Thinkpad T420s and Ubuntu Studio 11.10. The brightness keys work fine but the increments are too large. I have the /sys/class/backlight/acpi_video0 and I can see the value of actual_brightness changing as I use the brightness keys - it changes between values 0,3,6,9,12,15. None of the listed answers for fine control works here, as follows: As the root user I can echo integers to brightness in the above folder. As an ordinary user I cannot. I do not have /usr/sbin/gnome-power-backlight-helper (because I'm using xfce perhaps?), and not sure what package it's from or if installing such a package would make sense since it's not what's currently managing the backlight. How can it be done, please?

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• Under what circumstances might an IIS6 website be automatically deleted?

  - by E. Anderson

  Late last week my colleagues did some hardware maintenance on one of our vmWare esxi servers. One of the guests is a Windows Server 2003 Web Edition system that runs our low-traffic web sites. We discovered this morning that one of those websites was no longer working with what appeared to be an SSL error. After logging in, I found that the web site in question had been deleted from IIS! Is it possible for this to happen without a user actually going in and deleting that single web site? All of the other sites were fine. The files for the site in question had not been touched. I just re-created the web site, assigned the SSL cert, and everything was working again. When I logged in, I did see the 'Unexpected Shutdown' dialog.

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• Screenflick Audio option in MacBook Pro

  - by John

  When after I shut down my MacBook Pro by holding the power button for a few sec, (which I found is bad for the computer, so I will not do anymore) I found that my speaker doesn't play until I plug in and out earphone into the machine. When my speaker is not working like this, and when I am on a random webcam chatting site like chatroulette.com, they can hear the music playing on my iTunes when I choose Screenflick Audio option in the Mic setting. But when the Speaker is working back again, they don't hear the music playing even when I do Screenflick Audio mode. How can I make it work? Also, how do you make the chatting partner hear my music playing on my computer while I talk to them (not via my speaker, since it's bad quality).

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• Upgrading HP DL185 G5 8LFF, is using a Dell J1520 4-Drop SATA Adapter possible?

  - by jpreed00

  The HP DL185 G5 8LFF model supports 8 3.5" drives and 1 optical drive. However, instead of the optical drive, I'd like to have 2x 2.5" drives instead. The problem is that the PSU has no more SATA power cables (even though the motherboard has 4 additional SATA data ports). The PSU does have a free 10-pin connector and it looks like the J1520 cable from Dell would fit the bill. Link to cable description Does anyone have any experience using these cables? Are they safe? Any other ideas for adding the disks to the server if I don't use the cable? Thanks!

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• Linux RAID0 - relocating member disk

  - by qdot

  I've got an issue I would rather handle with the array online - I am using RAID0 for temporary video storage - data that is low-cost to restore, but that is used frequently. The software array looks like this: md1 : active raid0 sdb1[2] sdc1[3] sdd1[0] sde1[1] 1953487616 blocks 64k chunks I have another partition (sda1) in this system, that I want to use to replace sdc1 (The drives are of varying age, and sdc1 is definitely the slowest one, limiting the entire array's sequential read performance to only 300MB/s). Is there a way to migrate the data from sdc1 to sda1 while the array is still online?

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• oracle virtualbox doesn't work for host Kubuntu since Lucid Lynx 10.04

  - by 13east

  I have a thinkpad edge 14 core i3 2.4 ghz and 4g ram; I have tried kubuntu 10.04, 10.10, 11.10, 12.04 and 12.10 (all x64 architecture); Both oracle and ose virtualbox only works properly to install XP and windows 7 quest system on kubuntu 10.04; For every other kubuntu release since, the guest installation goes as far as formatting the virtual drive, freezes at this step, and doesn't even go as far as copying files to hard-drive to begin installation. But virtualbox has not stopped responding to commands; I can kill that one specific window with the problem installation ("machine" - "close" - "power off the machine") and start over again without having to force-kill virtualbox application. If anyone knows how I can go about addressing this problem, any help you can provide would be very much appreciated. Thank You.

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• USB-keyboard & mouse powered off in windows-7

  - by sinned

  I have a problem with a pc where usb devices are not getting any power as soon as windows starts up (it works in preboot). This pc has no ps/2, so there is no chance for input, also not in secure boot mode. I "tidied up" using sysinternals autostart, so there is a chance I messed something up here, although I'm quite sure I only deleted some old printer drivers from autostart. I do not know how to reset this, I cant even log in because there is no input possible. I could use a linux live cd, but I don't know what to do there because there is no sysinternals from linux into a not running windows... To make things even worse, I have the windows installation completely encrypted with truecrypt, so I haven't even tried windows recovery cd yet. There is no loss of data since I can access the disc with a live-linux, I only want to use it again without resetting up everything. Any suggestions?

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• Why would anacron not be running?

  - by Rory

  I have a Ubuntu system that has anacron installed. However I'm pretty sure it's not running. It's not running the commands in /etc/cron.daily to rotate the syslog files (I'm using sysklog, which has its own rotating log method, not using logrotate). The last time the logs were rotated were in October 2009. /var/spool/anacron/cron.daily exists and the contents are 20091015. AFAIR we had a power outage then, and everything rebooted. How can I debug anacron? How can I see why it's not running? My first instinct is to look for /var/log/anacron, but that's not there. How can I fix it to make it run again?

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• Suggestion of device WiFi range in it's spec. Possible?

  - by SeeR

  I have router Draytek Vigor 2100VG at home almost in the center of it. The farthest point at my home is my balcony, ~12m from it. I have constant wifi signal range problems with some of my devices, but not with others. Notebook Lenovo W510 - no problems Nokia Home Music - always on 10m - no problems Sony PS3 - always on 7m - no problems Sony tablet S - problems around 6m Sony PSP - problems around 8m Sony PS Vita - problems around 8m Nokia E63 - problems around 8m I'm curious why my Notebook don't have any problems even on the balcony? I guess it has better hardware or uses more power for transmission. This information is really important when you want to buy new device/computer, so my real question is: Can device wifi range can somehow be found/suggested from official hardware technical specification? If not Is there some web page with wifi range reviews?

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• Google Chrome passphrase : where is it?

  - by danielson

  Every time I do a fresh install, Google Chrome asks me for my passphrase. Have searched high and low in Google's help forum and have yet to receive or find any form of response. When I do a fresh install, if I try to enter the passphrase (with all possible passwords i can recall) nothing works and I can't recover my extensions, bookmarks etc. On the other hand, if I wait a bit, everything falls to place. I close that window asking for passphrase and all my extensions, bookmarks are back. The failure to enter a proper passphrase code gets me a message to change my passphrase in my account settings. Who knows where that is! No one at Google's forum seems to know anything about this "passphrase".

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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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