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• mpirun -np N, what if N is larger than my core number?

  - by Daniel

  Say I have a 4-core workstation, what would linux (Ubuntu) do if I execute mpirun -np 9 XXX Q1. Will 9 run immediately together, or they will run 4 after 4? Q2. I suppose that using 9 is not good, because the remainder 1, it will make the computer confused, (I don't know is it going to be confused at all, or the "head" of the computer will decide which core among the 4 cores will be used?) Or it will be randomly picked. Who decide which one core to call? Q3. If I feel my cpu is not bad and my ram is okay and large enough, and my case is not very big. Is it a good idea in order to fully use my cpu and ram, that I do mpirun -np 8 XXX, or even mpirun -np 12 XXX. Q4. Who decides all of these effciency optimization, Ubuntu, or linux, or motherboard or cpu? Your enlightenment would be really appreciated.

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• IIS High use & Server Performance issues

  - by HaydnWVN

  Have an SBS2011 running Exchange, a database app and a few other things serving 5 users (3 low use, 1 high). The server was never specced for the database app so it isn't as powerful as I'd like... Only 12GB RAM. We have increasingly found performance problems with this server, last week it was so bad I couldn't even connect remotely. To free up some available RAM I have (over the past month or so): Restricted the Exchange Message Store to 1GB with (so far) no ill effects. Restricted SQL Databases (including SBSMonitoring and Sharepoint/##SSEE (Which isn't used)). Now I am finding that IIS Worker threads are using up the available memory and I have (so far) been unable to track down much useful information about restricting them. This server is not 'serving' anything web-based apart from OWA that I am finding people using because Outlook is so slow (again related to the Servers performance). I am aware that Exchange on SBS2011 is designed to use up available resources (and concede when other applications request). But it is not doing so (or anywhere near fast enough) for our needs. Opening the database application (using Postgres) takes 5+ minutes from client machines and regularly times out or crashes due to this. After a reboot (before SQL/Exchange/IIS databases are very large/totally cached) we get the performace we need and expect. Previously a reboot once a month was enough... Then once a week... Now they have taken to rebooting it almost daily!

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• TeamCity sends inadequate responses after Selenium tests

  - by Dmitriy Sukharev

  I have a TeamCity 7.0.2 at CentOS 6.2 server without X Server. I've installed x11-fonts*, xvfb, firefox, xauth, extracted env. variable DISPLAY=localhost:1, and started xvfb. After that I could start Selenium tests using maven. Tests are executed, but there's an issue with TeamCity. Usually TeamCity starts hehaves absolutely inadequate (it confuses images at the page, sends xml or strange text ampersants and numbers in responses and is a bit slower), also tests are executed 4 times slower (1h 15m) at server than at tester Windows 7-based machine (25m). It worth to notice that tests launch two Jetty servers for tested application (one for REST-services application and another for client). In TeamCity I set JVM command line parameters: -Xms256m -Xmx1224m -XX:MaxPermSize=320m, and Additional Maven command line parameters ends with "-DMAVEN_OPTS=-Xmx1024m" (without quotes). Also both web-services and TeamCity uses the same Oracle server (but different Oracle users). Finally TeamCity and its build agent is at the same server. Server has only 4GB of RAM, but during testing there're 400MB of RAM and 1.2GB of swap. TeamCity and Firefox uses about 65% of CPU during testing. There's no firefox process after end of testing. My knowledge about Selenium is weak. I only know that we use 2.20.0 version of selenium-java maven dependency. Please help me to determine why TeamCity sends wrong responces after Selenium tests. I've tried to give you all information I have, but feel free to ask me for more information.

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• MsMpEng.exe (Windows Defender?) uses a lot of CPU at startup and runs two instances on a single core

  - by dlamblin

  I'm using Windows XP Professional SP2 on a single core AMD64 processor, and I've got two instances of MsMpEng.exe starting up when I start up and log in. They use 64MB and 32MB of ram and 140MB and 80MB of virtual memory, and fluctuate around 80% CPU usage for about 5 minutes at start up. They are (I read) associated with Windows Defender, but I'm concerned about: There's two of them, everything I read generally has only one reported. They might be scanning each other, and I want that to stop. They might be getting scanned by avgrsx.exe (AVG Free 8) (uses about 16Mb v ram) They might also be scanning moe.exe (assosciated with ms live mesh, which I'm considering getting rid of) Lastly I have Microsoft Security Essentials. I don't know the process name associated there. The main concern of mine (apart from the double instances) is that these are all trying to prioritize scanning each other at once except maybe moe.exe. This might seem legitimate but is likely a useless drain on resources. Have I made a mistake in having all of these installed, or is there a way to inform them not to do whatever they're doing that's taking about 5+ minutes at start up? [I also have Google Desktop, but I'm keeping that.] Comment if none of this makes sense to you.

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• Reducing IO caused by nginx

  - by glumbo

  I have a lot of free RAM but my IO is always 100 %util or very close. What ways can I reduce IO by using more RAM? My iotop shows nginx worker processes with the highest io rate. This is a file server serving files ranging from 1mb to 2gb. Here is my nginx.conf #user nobody; worker_processes 32; worker_rlimit_nofile 10240; worker_rlimit_sigpending 32768; error_log logs/error.log crit; #pid logs/nginx.pid; events { worker_connections 51200; } http { include mime.types; default_type application/octet-stream; access_log off; limit_conn_log_level info; log_format xfs '$arg_id|$arg_usr|$remote_addr|$body_bytes_sent|$status'; sendfile off; tcp_nopush off; tcp_nodelay on; directio 4m; output_buffers 3 512k; reset_timedout_connection on; open_file_cache max=5000 inactive=20s; open_file_cache_valid 30s; open_file_cache_min_uses 2; open_file_cache_errors on; client_body_buffer_size 32k; server_tokens off; autoindex off; keepalive_timeout 0; #keepalive_timeout 65;

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• Tomcat performing terribly for no apparent reason

  - by John

  We're running a game application .WAR on Tomcat 6 on an Amazon EC2 server, 8 core processor, 7gb RAM. The application uses a MySQL database hosted on Amazon RDS. This Facebook application takes ages to access when a mere 20-30 users are playing it. Big difference from 1-2 users. The entire .WAR is ~4mb, all static content hosted elsewhere. The server has never been close to running out of RAM. The CPU utilization has never been higher than 13.5-14%. Even with ~500 users that completely slowed everything to a standstill. The thread count or threadpools isn't close to being maxed out. I heightened maxthreads but it didn't make a noticeable difference. My theory is that Tomcat can only use one processor core, which would explain why it was slowed to a halt even though CPU usage was stably at 13-14% at the activity spike. But I'm struggling to understand why it would only use one CPU core. There is no processor cap in server.xml. The app contains several servlets (4 or 5). There is no mention of SingleThreadModel in the Java code. WHAT could be causing the application to run extremely slowly? If there is only 1-5 people on the application it runs fine. With 20-30 people it's barely contactable.

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• How to migrate a running KVM (with full disk copy) to another node?

  - by klipz

  I'm doing tests on KVM, and I'd like to see if I can make a hot migration, I mean the virtual machine won't stop running during the migration (but a few seconds of freeze is ok). I use a small cluster for my test : kvm1, kvm2, and kvmnfs. kvm1 and kvm2 runs the virtual machines kvmnfs is a NFS server, and it's mounted on /KVM on both kvm1 and kvm2 To migrate a VM (only RAM in fact) from kvm1 to kvm2, I run the same kvm command on kvm2 (with -incoming tcp:0:4444) that on kvm1, then I use "migrate -d tcp:kvm2:4444" : It works great, since the VM file is common to both machines. Now, I wan't to make a full migration (RAM + disk) of a local VM file (no more NFS) of kvm1 to kvm2. I tried to create an empty file, with touch, on kvm2 and use the same kvm command line + the "-incoming ..."). Then on kvm1 I use "migrate -d tcp:kvm2:4444" : It copies everything, then... the VM fails (any I/O disk gives an I/O error) ! And my VM file on kvm2, the one I created with touch, as still a size of 0 bytes. What am I doing wrong ? What is the exact command to use on kvm2 ? And what is the command to launch, in the monitoring mode, on kvm1 ?

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• I need help choosing between two configurations of the Dell Studio 14

  - by Adnan

  There are two configurations of the Dell Studio 14 (1458) which I'm looking at: Config 1: Core i7-720QM @ 1.6 GHz; ATI Mobility Radeon HD 5450 1GB; 4gb DDR3 RAM @ 1066 MHz; 500 GB SATA HDD @ 7200 RPM; Price: $999 Config 2: Core i5-430M; ATI Mobility Radeon HD 4530 512MB; 4GB DDR3 RAM @ 1066 MHz; 500 GV SATA HDD @ 7200 RPM; Price: $874 What I want to know is, would config 1 still be able to do decent gaming (maybe some Starcraft II), and is there a great performance difference between the i5 and i7 processors? Is the $130 extra worth it for the i7 and better graphics card? I do more than just basic computing. I plan on getting into web design (specifically using Photoshop and Dreamweaver), and I wish to do gaming. I know Conifg 1 is the better value, but I want to be sure that the $130 more is truly worth it. I dont have too much money and want to spend wisely as possible, yet I am a computer geek and plan on doing a lot more than the average user.

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• Computer Comparison - which is "better"

  - by David Murdoch

  A company I work with recently replaced their old server and gave it to me. Their old server is a Dell PowerEdge 2600. I've been playing with the machine and even installed Windows Server 2008 on it...and it seems to run it pretty well. Here are the specs for the two machines: Dev Machine: AMD Athlon64 3000+ 2.38 GHz (overclocked from 1.8GHz [@ 280x8.5] - it is stable-ish) Memory (RAM): 1x1GB OCZ PC3200 (Dual-Channel) 300GB HD OS: Windows XP Pro (32bit) SuperPi 1M digit test: 40 seconds Dell PowerEdge 2600 Server: Intel Xeon CPU 2.8GHz 2.8GHz Memory (RAM): 512MBx2 (PC2700, not dual channel) 68GB HD (RAID 5) OS: Windows Server 2000 (32bit) SuperPi 1M digit test: 56 seconds [using 1 processor] (Themes and Aero-Flass UI turned off, of course) I use my computer to regularly run Photoshop CS5, Illustrator CS5, Flash CS5, 5 browsers (Chrome, FF, IE, Safari, Opera), iTunes, Visual Studio 2010, and Kaspersky Internet Security 2010 [sometimes simultaneously :-) ]. The SuperPi test has my dev machine coming in about 30% faster than the Server machine...though this could be due to the server running "Vista" with background processes prioritized. Do you think it would be realistic/advantageous for me to move from my dev machine to the Dell PowerEdge 2600? Is it possible to install additional DVD drives/burners on the server? Can I install my internal 300 GB hard drive on the server? Can I add some USB 2.0 ports? Note: I'll probably install Win XP Pro on the dev machine if I do switch. If not, are there any creative and useful way for me to take advantage of this server (with the goal of faster computing)?

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• No OS will boot, all freeze

  - by Gyan

  This is for a computer with the following configuration: Asus P5KPL-AM/PS motherboard Pentium D 820 (dual core 2.8 GHz) 1 x 2 GB DDR2-800 Transcend RAM 1 SATA2 Samsung 160 GB HDD 1 PATA LG CD/DVD Writer PS/2 generic Keyboard USB Razer mouse The computer was working fine till a month ago with a Hitachi HDD in place of the Samsung. But that drive died and I sent it in for warranty replacement. Since then and till last week, the computer had not been turned on. I then got hold of a spare but XPSP2-loaded Samsung drive from another computer and decided to get this computer temporarily running. However, when I tried to boot into XP, it didn't load. It got stuck at the first graphical screen. When trying Safe Mode, the file list would be updated up to diskio.sys and then freeze. If I tried to boot Kubuntu off a CD, I would get past the first menu, but then get stuck at the subsequent graphical interface in the loading process. A similar thing happend with a friend's Windows XP-on-a-pen-drive. I switched the RAM into the other slot, but no luck. Then I booted the Ultimate Boot CD and ran Memtest86+ and a couple of the bundled CPU stress tests but these detected no errors. Some searching on the Internet brought up the notion of the CPU failing to switch from "real" to "protected mode". I'm hoping to get a fix on what the problem is and what I can do about it. Edit: I've flashed to the latest BIOS, but that doesn't help. Also, Knoppix LiveCD also freezes. I notice that the LED in my mouse goes off at the time of freeze, but trying to boot without the mouse connected produces the same result.

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• Windows Bluescreen - atikmpag.sys

  - by Mochan

  Information Name: atikmpag.sys bluescreen (BSOD or BlueScreen of Death) Error code: 0x00000116 Appears when: Playing games, watching videos Can be reproduced: Yes Cause: Graphics Card is the main assumption System Specifications Before we begin - I will inform you of my specifications. OS: Windows 7 x64 Home Edition Model: Dell Inspiron 15R Special Edition (aka Inspiron 7520) (Add 2GB of RAM to the model linked) Hard Drive: 1TB CPU: Intel Quad-Core i7 Sandy Bridge (I think) Processor at 2.10GHz (I think it can be clocked to 3GHz?) RAM: 6GB (I think 1 x 4GB and 1 x 2GB) Display: 15.6" HD (1366x768) Graphics: AMD Radeon HD 7500M 2GB Details So now that you know some basics about my computer, I'll get to the problem. Being an Ubuntu user I hardly use Windows, but occasionally I do. Like to run Skyrim and other games incompatible with Linux and WINE. The new Sims 3 Seasons patch is also now not supported. When playing these two games and other ones, theoretically. I have also heard others saying that while watching HD movies and video series it also happens. While watching the bluescreen as it happens, I see it is the 'atikmpag.sys' error. I have not installed much and nothing significant. I think I have downloaded Skyrim, Firefox and The Sims 3. I haven't done much more... since Ubuntu is definitely the best in comparison! (No hate, just a joke :P). I can reproduce it easily (just by running a game for less than a minute). It is always there each time, but it's never at a specific time or anything. So far I have found that it may be caused by lack of power to the graphics card, or it may be damaged or fried. Since I've had the computer for a mere 4 months (and have had other problems with it also). I have contacted Dell but they are useless beyond belief. Anyone with any information, solutions or details are encouraged to share your knowledge, as it would be immensely appreciated.

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• Please advise on VPS config choice (with SQL Server Express)

  - by tjeuten

  Hi all, I might be interested in getting a VPS hosting plan for some small personal sites and .NET projects. Was thinking of Softsys Bronze Plan, as my current shared host plan is with them too. The stuff I want to host has grown beyond the capabilities of a Shared hosting plan, and I also want more control over the IIS/ASP.NET configuration, that's why I'm considering VPS. The main config details would be: Hyper-V 30 GB of diskspace 1 GB of RAM More info here: http://www.softsyshosting.com/Windows-VPS-HyperV.aspx Does anyone have experience with this plan (or something similar from another host), and maybe could answer these couple of questions: Bronze has a total diskspace of 30GB. Is the OS part of this quota or not ? If so, how much does a base configuration with Windows 2008 take up in diskspace ? Would you advise Windows 2008 R2 or Normal. Or would you advise to use Windows 2003 with this config. I'm planning on running a SQL Server Express install too. Would 1 GB of RAM be enough for both the Windows 2008 (R2) and SQL Express. The database load will not be that very high (a couple of 1000 records returned each day). The DB will most likely be far away from the 4GB limit, that's why I'd go for a SQL Express instead of paying extra licensing costs for a SQL Web install. But I'm more concerned about performance. Would you recommend Softsys as a VPS host ? I've been with them for one year for my Shared hosting plan, and have no complaints so far. Also, as I have no VPS experience, what are the pitfalls I need to be aware of, in terms of performance mainly, but maybe in other areas too ? Mathieu

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• Linux: prevent VNC from swapping like mad

  - by Weezy

  I'm accessing a MacMini (with MacOS X 10.4) from my Linux machine using VNC and there's an issue that is driving me crazy... My Linux machine has 4 GB of ram and I run a lot of various apps on it and I've got no issue at all. It's all snappy and don't hear the hard disk swapping/read/writing too often. Now with VNC, the hard disk is swapping like mad... When I'm moving things on the OS X desktop. So I was thinking of creating a ramdisk and forcing the temp VNC files to go into that ramdisk but the problem is I can't find any temp files. I've attempted to do that: #!/bin/bash while [ true ] do lsof | grep vnc done And eyeball parse the output to try to find some temp file: no luck. The VNC version I'm using is this one: $ vncviewer -version VNC Viewer Free Edition 4.1.1 for X - built Jan 30 2009 19:33:16 Copyright (C) 2002-2005 RealVNC Ltd. No matter how much data is coming from the Mac, there should be plenty of memory (4 GB of ram) so there's really no reason to swap like crazy. This is driving me mad. Any help as to how I could solve this problem is most welcome because this is literally driving me nuts.

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• Physical-to-virtual for personal use

  - by Journeyman Geek

  One of my current projects involves reducing the number of old computers lying around. So far, the office systems have been downsized from 5 to 2. One system which had no data on it was dumped entirely, while three other identical boxes were consolidated into to one (I swap hard drives as needed and they just work(tm)). I want to make further cuts. The physical systems in question all run windows xp sp3, and were old Pentium 4s with 256 MB of RAM. Currently, I have got a VirtualBox running on another system. My intention is to migrate all services to that. We can assume that disk space and RAM on the host is not an issue. I'd rather not go with a client-server physical-to-virtual (P2V) method like what VirtualBox uses now. I have a few specific concerns as well - specifically whether I'd need to reactivate or sysprep for dissimilar hardware first. An offline tool for imaging (Windows or Linux) would not be an issue since the drives could be mounted onto another system I have anyway or I could use a LiveCD. What would be my options for P2V conversion, and what would I need to keep in mind when doing this?

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• Computer locking up, looking for bootable hardware diagnostic tool.

  - by Carl Menke

  Well today I helped my friend build a computer. All went pretty well until we got to installing Win7. Thing is, we thought, it was crashing constantly. I adjusted pretty much every setting in the BIOS and removed as much hardware as possible to try and prevent a crash. No dice. So far I've tried running an Ubuntu live cd without the harddrive installed. Nope, crashed on boot. And then I just tried Microsoft's ram utility disk and it eventually locked up on that (the ram passed though). So it seems to me like it's either the CPU (AMD PhenomII x3) or the motherboard that could be bad, but I don't know how to test them individually for problems. I thought it could be a overheating issue, but the BIOS reports that the CPU temp is fine idling around 34C. Any advice or diagnostic disk that could help me out? TL;DR: Computer locks up frequently during use (cannot even boot/install an operating system), memory is fine, probably CPU or Mobo, BIOS says CPU temps are fine. What should I try?

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• ESX Scheduler and NUMA issue

  - by babyg_wc

  On our 24 core bl685 (4sockets x 6core), we find that NUMA nodes 0 and 1 are pretty busy (unfortunately resulting in elevated cpu ready times on the VMS), whilst NUMA nodes 2 and 3 are almost unused. I thought this just maybe a ESX4 U1 issue, so I had a colleague with a 32 core (dl785) farm investigate, and it seems that his last 3 or 4 NUMA nodes are also not really being utilised. ESX seems to have a weakness when it comes to balancing lightly loaded NUMA boxes, Im going to enabled node interleaving in the BIOS and see if the scheduler balancers across all 24 cores, instead of just 12!... For those of you with large core counts, I would suggest you fire up you viclient, and check Physical CPU useage (or esxtop), I would be interested to hear what your results are. Please note, that its only the lightly loaded (eg less than 30% cpu load on the esx host) that seems to have the biggest issue with load imbalance. Thoughts/comments. PS ive logged a SR with vmware to assist, also the other "problem" could be that we have 128gb of ram in each host, and therefore the scheduler sees no good reason why it shouldnt try and cram all vms's into the first two NUMA nodes, as we only have around 50gb of ram worth of vms on each host...

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• Firefox 29 - how do I delete history entries visited fewer than x times

  - by lousyuser

  Context: I've been using my Firefox profile for a couple of years now. My history file has become huge, naturally. I got Firefox Sync set up between my main desktop PC and my laptop. HW configs: PC: i5-3450, 8 GB DDR3 RAM, Crucial M4 128 GB SSD laptop: Pentium SU4100, 4 GB DDR3 RAM, WD 5400 rpm HDD Accessing history entries when typing into the Awesome Bar on my desktop takes quite a long time despite the decent config, the laptop is even slower. The experience is quite unresponsive. I figured if I cleared the history up a little bit, I might avoid creating a new profile to speed things up. The question itself: to illustrate: Is there a way to delete all history entries that have been visited fewer than x (let's say 5) times and at the same time the recent visit is fewer than y (let's say 120) days old? afaik the history file is some kind of SQL database, but I'm not really sure how the data is saved, if there's a "safe way" to edit it and what the query to do what I need would look like. Thanks in advance for any help. I kept browsing through previous SuperUser questions to see if I could find relevant information. "In my Firefox profile directory, there is a filed named places.sqlite. Opening it with sqlite reveals (amongst others) the tables moz_places and moz_historyvisits. It seems that moz_historyvisits uses the primary of moz_places to refer to the URLs." As I'm unfamiliar with databases, I don't really understand the way the two tables mentioned in the quote are related. screenshot of a part of the tables I've noticed the visit_count is in a standard format, making it easy to work with. The last_visit_date looks encrypted to my naked eye, but I can't see in which way. Hope that helps, I'm at my wits' end.

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• Value of Itanium over x86_64 for Oracle Deployment

  - by Antitribu

  We are looking at a new environment to run our Oracle Database running on SUSE (potentially migrating to RedHat). Our database is approximately 100GB and performs adequately on our current hardware (x86_64) with approximately 6GB of ram allocated to it. We are growing quickly however and will require more performance shortly. Given the cost of Oracle licenses we would like to maximize the value from each license by choosing the most appropriate CPU to run the software on. The questions are: Are there substantial benefits to looking at Itanium hardware, are there any drawbacks? Is there a point where Itanium starts to scale out better? What are the long term support options for Itanium? Given the dominance of x86 would it be safer long term to stick with x86? On average what would be the performance benefit of implementing an Oracle database on Itanium over x86_64? Is this an issue at all or will other factors (IO/RAM) cap out first? If anyone can point me towards some solid documentation on comparisons between the two platforms that provides good case analysis of when to choose which I'm more than happy to accept that as an answer.

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• Abysmal transfer speeds on gigabit network

  - by Vegard Larsen

  I am having trouble getting my Gigabit network to work properly between my desktop computer and my Windows Home Server. When copying files to my server (connected through my switch), I am seeing file transfer speeds of below 10MB/s, sometimes even below 1MB/s. The machine configurations are: Desktop Intel Core 2 Quad Q6600 Windows 7 Ultimate x64 2x WD Green 1TB drives in striped RAID 4GB RAM AB9 QuadGT motherboard Realtek RTL8810SC network adapter Windows Home Server AMD Athlon 64 X2 4GB RAM 6x WD Green 1,5TB drives in storage pool Gigabyte GA-MA78GM-S2H motherboard Realtek 8111C network adapter Switch dLink Green DGS-1008D 8-port Both machines report being connected at 1Gbps. The switch lights up with green lights for those two ports, indicating 1Gbps. When connecting the machines through the switch, I am seeing insanely low speeds from WHS to the desktop measured with iperf: 10Kbits/sec (WHS is running iperf -c, desktop is iperf -s). Using iperf the other way (WHS is iperf -s, desktop iperf -c) speeds are also bad (~20Mbits/sec). Connecting the machines directly with a patch cable, I see much higher speeds when connecting from desktop to WHS (~300 Mbits/sec), but still around 10Kbits/sec when connecting from WHS to the desktop. File transfer speeds are also much quicker (both directions). Log from desktop for iperf connection from WHS (through switch): C:\temp>iperf -s ------------------------------------------------------------ Server listening on TCP port 5001 TCP window size: 8.00 KByte (default) ------------------------------------------------------------ [248] local 192.168.1.32 port 5001 connected with 192.168.1.20 port 3227 [ ID] Interval Transfer Bandwidth [248] 0.0-18.5 sec 24.0 KBytes 10.6 Kbits/sec Log from desktop for iperf connection to WHS (through switch): C:\temp>iperf -c 192.168.1.20 ------------------------------------------------------------ Client connecting to 192.168.1.20, TCP port 5001 TCP window size: 8.00 KByte (default) ------------------------------------------------------------ [148] local 192.168.1.32 port 57012 connected with 192.168.1.20 port 5001 [ ID] Interval Transfer Bandwidth [148] 0.0-10.3 sec 28.5 MBytes 23.3 Mbits/sec What is going on here? Unfortunately I don't have any other gigabit-capable devices to try with.

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• ubuntu not detecting CDdrives

  - by Mirage

  Ihave insatlled ubuntu 10.4 on my compuer with 6 cd drives. Now initiallyi had window server 2008 and i had to install marvel raid sata controller and then my window detected all 6 drives. Now ubuntu is detecting only 3 drives and i have not found marvell drivers for ubuntu bt i have drives for window 2008. Now my question is if i have vrtual machine inside ubuntu using vmware workstation and i install that driver. then can VM dtect thse 6 drives or host has to detect those drives first to make VMs use that Ubuntu shows this thing from terminal *-cdrom:0 description: DVD-RAM writer product: DVDRAM GSA-H10N vendor: HL-DT-ST physical id: 0.0.0 bus info: scsi@0:0.0.0 logical name: /dev/cdrom2 logical name: /dev/cdrw2 logical name: /dev/dvd2 logical name: /dev/dvdrw2 logical name: /dev/scd0 logical name: /dev/sr0 version: JL10 capabilities: removable audio cd-r cd-rw dvd dvd-r dvd-ram configuration: ansiversion=5 status=nodisc *-cdrom:1 description: DVD writer product: DVDRRW GWA-4164B vendor: HL-DT-ST physical id: 0.1.0 bus info: scsi@0:0.1.0 logical name: /dev/cdrom logical name: /dev/cdrw logical name: /dev/dvd logical name: /dev/dvdrw logical name: /dev/scd1 logical name: /dev/sr1 version: 1.01 serial: [HL-DT-STDVDRRW GWA-4164B1.0105/05/12 capabilities: removable audio cd-r cd-rw dvd dvd-r configuration: ansiversion=5 status=nodisc Is t detecting all drives or thise local names just same

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• MySQL Master-Master w/ multiple read slave cost effective setup in AWS

  - by Ross

  I've been evaluating Amazon Web Services RDS for MySQL and costing out potential scenarios involving a simple multi-AZ deployment read/write setup vs. a multi-AZ deployment mysql master (hot-standby) with additional read-only slaves. the issue I'm trying to cost-optimize includes their reserved instance vs on-demand instances. Situation 1: purchase reserved multi-az setup for Extra-large-hi-mem(17GB RAM) instance for $5200/yr and have my application query the master all the time. the problem is, if I don't need all the resources of the (17GB RAM) all the time and therefore, especially not a hot-standby, what alternatives for savings can a better topology create, like potentially situation 2 below: Situation 2: purchase reserved multi-az setup using smaller master instances than above for the master-master hot-standby to receive the writes only. Then create and load balance several read-only slaves off the master and add/remove and/or scale up/down the read slaves based on demand. This might only cost $1000 + the on-demand usage of the read slaves. My thinking is, if I have a variable read-intensive application load, with low write load, the single level topology in situation 1 means I'm paying for a lot of resources at the write level of topology when I don't need them there. My hope is that situation 2 can yield cost savings from smaller reserved instances on the master-master resource level allowing me to scale up and down and/or out on the read-level according to demand as needed. Does anyone see a downside to doing this or know of some reason this isn't possible with RDS? Any other thoughts or advice always welcome of course. Thanks in advance, R

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• How to diagnose occasional sudden resets?

  - by steve314

  I have a Windows XP system, and have recently upgraded by adding 2 1GB sticks of RAM to the 2x0.5GB already present. Since then, about once per day (the system is used 8+ hours per day), the system has suddenly and unexpectedly reset. On a couple of occasions, the system has frozen completely, only responding to the power button being held in for several seconds to force power off. Nothing at all ever appears in the system event log that might indicate a possible cause - everything seems to suggest business as usual. Sounds like faulty memory - but memtest86+ says otherwise. A full test, taking over an hour, found no issues. The next likely suspicion, then, is that I've knocked something while installing the RAM. Trouble is, everything I can think of to test seems fine. I've opened up the case and prodded a few things around, hoping to get better contact on connections etc, but there's no sign yet as to whether that has made a difference or not. I thought about a malware-related timing fluke, but again, so far as I can tell I'm all clear. All I can think of to add to my checklist (mainly of things that I can't easily check) is... The power supply is (1) only 350W, (2) not necessarily the best quality, and (3) powering a Prescott P4 640 3.2GHz. Could that be borderline overloaded or about to die? How do I check? Is it possible that the CPU isn't getting cooled properly? I haven't had the fan past normal tickover even doing video encoding, and the only sane temperature reading from SpeedFan is pretty steady at 36 celcius, so probably not. Any thoughts? Is there a standard procedure for diagnosing this kind of fault?

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• Hosting websites in our Workplace custom-built datacentre

  - by i.h4d35

  I'm faced with unique learning opportunity at work at the moment. Due to the slowdown (amongst other reasons), the powers that be at my office have decided to abandon our shared hosting providers (both shared and dedicated hosting) and have decided to host the websites at our office's datacentre. We're running 7 websites, wherein the average unique hits per day at the moment is about 900. We have 2 servers set aside for this - one is a DELL POWER EDGE 1850 (Intel Xeon 3 GHZ*2, 4GB RAM, 73GB HDD and the other is an HP DL 380 G3 (Intel Xeon 2.8 GHz, 6 GB RAM, 73 GB HDD) a) I would like to know the pros and cons of going ahead with this project.All the sites will be hosted on a single IP. In all probability, the OS is going to be CentOS. b) Do you think I should consider Virtualization into this equation (KVM/Xen)? I was thinking in terms of separate instances of the DB server and the frontend though I do not know if this is the best way to go. c) Should I be trying to use cloud stacks like OpenStack and try to make it look like websites hosted on some sort of Public Cloud? (something that I checked out here). Here is something else I came across, which looks similar to what needs to be done at our office. About the websites - Of the 7 websites, 4 are basic static websites which basically gives a whole lot of information about a few local institutions. The remaining 3 are local product-based websites developed in PHP wherein end user can view products and order them online. I am trying to take this as a learning experience wherein I can learn to build something from scratch and save the company a little something in the process. The migration needs to be completed by Easter so I guess it gives us some time (or am I being overly optimistic??). I am confused here and would appreciate all the help I can get. Thanks in advance.

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• apache performance timing out

  - by Mike

  Im running a webserver where I'm hosting about 6-7 websites. Most of these websites get their content from MySQL which is hosted on the same server. Traffic average per day is about 500-600 unique visitors, about 150K hits per week. But for some reason sometimes websites send a timeout, OR sometimes websites dont load all images. I know that I should perhaps separate static content from dynamic content, but for now I think that's not a possibility. I would appreciate any suggestions on how could I improve the performance of apache, so it doesn't keep timing out. Server is running on Sempron LE 1300; 2.3GHz,512K Cache 2GB RAM 10Mbps/1Mbps Services: MySQL, ProFTPD, Apache. Private + Shared = RAM used Program ---------------------------------------------------- 1.2 MiB + 54.0 KiB = 1.2 MiB proftpd 4.1 MiB + 23.0 KiB = 4.1 MiB munin-node 20.8 MiB + 120.5 KiB = 20.9 MiB mysqld 47.3 MiB + 9.9 MiB = 57.3 MiB apache2 (22) top: Mem: 2075356k total, 1826196k used, 249160k free, Timeout 35 KeepAlive On MaxKeepAliveRequests 300 KeepAliveTimeout 5 <IfModule mpm_prefork_module> StartServers 10 MinSpareServers 20 MaxSpareServers 20 MaxClients 60 MaxRequestsPerChild 1000 </IfModule> <IfModule mpm_worker_module> StartServers 2 MaxClients 150 MinSpareThreads 25 MaxSpareThreads 75 ThreadsPerChild 25 MaxRequestsPerChild 0 </IfModule>

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• VMWare Workstation Linux Host performance tuning

  - by Hoghweed

  I need to improve my linux hosted vmware workstation for using multiple virtual machines at the same time. I feel very stupid I lost a great blog post link which I found last month (and I'm not able to find it again..) so I try to ask here if anyone can help me: This is my host (laptop): 16GB DDR3 Ram HDD Hybrid 750GB 7200 (8GB SSD Cache) Mint 15 x64 Kernel 3.9.7 swappiness set to 10 The above are the important things about the host. So, My need is the ability to run 2 or 3 VMs at the same time. The lack of performance is about the disk, The last time from that blog post I lost, I setup /tmp to be mounted ad a memory partition and in my previous installation that was good, now I'm not able to find a good solution to tweak the things. I think with 16GB o RAM there will be no problems to run multiple VMs, but whe they start to swap or use the /tmp things going bad (guest cursor going too fast after a freeze, guest freeze and so on) Anyone can help me to fit a good host tweak and configuration to get better performance? Thanks in advance

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