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• Linux - real-world hardware RAID controller tuning (scsi and cciss)

  - by ewwhite

  Most of the Linux systems I manage feature hardware RAID controllers (mostly HP Smart Array). They're all running RHEL or CentOS. I'm looking for real-world tunables to help optimize performance for setups that incorporate hardware RAID controllers with SAS disks (Smart Array, Perc, LSI, etc.) and battery-backed or flash-backed cache. Assume RAID 1+0 and multiple spindles (4+ disks). I spend a considerable amount of time tuning Linux network settings for low-latency and financial trading applications. But many of those options are well-documented (changing send/receive buffers, modifying TCP window settings, etc.). What are engineers doing on the storage side? Historically, I've made changes to the I/O scheduling elevator, recently opting for the deadline and noop schedulers to improve performance within my applications. As RHEL versions have progressed, I've also noticed that the compiled-in defaults for SCSI and CCISS block devices have changed as well. This has had an impact on the recommended storage subsystem settings over time. However, it's been awhile since I've seen any clear recommendations. And I know that the OS defaults aren't optimal. For example, it seems that the default read-ahead buffer of 128kb is extremely small for a deployment on server-class hardware. The following articles explore the performance impact of changing read-ahead cache and nr_requests values on the block queues. http://zackreed.me/articles/54-hp-smart-array-p410-controller-tuning http://www.overclock.net/t/515068/tuning-a-hp-smart-array-p400-with-linux-why-tuning-really-matters http://yoshinorimatsunobu.blogspot.com/2009/04/linux-io-scheduler-queue-size-and.html For example, these are suggested changes for an HP Smart Array RAID controller: echo "noop" > /sys/block/cciss\!c0d0/queue/scheduler blockdev --setra 65536 /dev/cciss/c0d0 echo 512 > /sys/block/cciss\!c0d0/queue/nr_requests echo 2048 > /sys/block/cciss\!c0d0/queue/read_ahead_kb What else can be reliably tuned to improve storage performance? I'm specifically looking for sysctl and sysfs options in production scenarios.

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• Recover data from physically damaged harddrive. What are my options?

  - by Michael Kniskern

  I was trying to replace the power supply in my desktop PC and ended up physically damaging the data connection from the hard drive to the motherboard. The plastic shelf for the copper prongs on the hard drive broke into the cable. Here is a picture of my handy work: I went to Best Buy Geek Squad to discuss my options and they said that they will need to send it to the recover center it could cost anywhere between $250 to $1600 USD to recover the data out the hard drive Is this reasonable for data recovery from a physically damaged hard drive? Are there any other options I can explore? I am going to talk to the data doctors to see what my options are. Update I took the HD to Data Doctors, and they told me that the SATA connection was broken to they would need to replaced the data connector and then copy the data to a brand new hard drive. So, with the initial analysis, cost of replacement parts, and data recovery fee it came out to $865.00 USD. The technician specifically stated if this was an older hard drive that would just need to replace the data connector. But because there is specific information related to the individual hard drive in the flash ROM, they need to transfer the data to a brand new hard drive.

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• Logitech QuickCam Pro 9000 & Windows 7 64-bit failing miserably

  - by Saxtus

  I am trying to install a Logitech QuickCam Pro 9000 webcam to Windows 7 64-bit. If I do it without using the Logitech drivers but instead the Windows Update ones, the camera works with low frame rate and without face tracking and all other bells and whistles that it's full driver provides. The moment I install the latest official Logitech driver, the problems begin: Camera works fine, until I decide to go to audio settings of the LWS panel or Windows'. Then LWS freezes and with it everything that tries to output audio. I am not able to open Playback/Recording devices window (it just doesn't appear) and system gets unstable and slow with LWS.EXE process not been able to close forcefully. If I reboot and forget the camera connected, this situation continues and system gets unstable from the beginning. If I reboot without the camera connected, everything works fine until I connect it and try to do something with audio settings of Windows or LWS panel. I should note, that until the freezing occurs, camera works as expected, with full frame rate, face tracking and everything that is expected to do. The soundcard is the ASUS SupremeFX II of the ASUS Striker II Extreme motherboard. Any ideas of what is causing this or what else to try so I can make it work as advertised? Thank you.

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• Can I make my PC backup and then sleep on demand with WHS?

  - by Simon

  I really hate the way that WHS backs up at a particular time in the morning. First of all I don't EVER want my computer turning on when I am not there. EVER. I have a Core-i7 laptop which literally could burn the house down quite easily if it were to turn on in a bag. I also don't ever want my PC to sleep unless I tell it to. I don't have hibernation or sleep enabled and this is the only way that WHS will sleep after a backup is complete. I know that Windows 7 has the ability to disable waking up when on battery power but it doesn't seem to work on my laptop. These are the possibilities (with wake timers left as default): 'Wake this computer for backup' ON - it turns on in my bag if i forget to turn it off - and stays on when the backup is complete. 'Wake this computer for backup' OFF - it backs up in the morning, but I need to leave the machine on all night. I say 'Backup Now' and then it backs up immediately. I can turn it off when its done if I'm still awake, but then that backup appears as 'locked' in the console and not 'automatically managed'. What I'd really like to do is : Click 'Backup and Sleep' and then go to bed. It will backup immediately and then sleep the PC. This backup must be 'automatically managed' and not appear as a 'locked backup' in my console Show me a confirmation that everything was backed up successfully (or not) when I turn it on. Is there any way to achieve this?

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• Managing disk in a VM

  - by dst

  I'm replacing my two old rack servers with a new one that has plenty of power to take over the functionality my current servers. The server is a 4U rack mount with 16 3.5" SAS drive bays, two 2.5" bays, a Xeon E3-1230v2 CPU and 32GB of ECC RAM. My issue is the following. I would like to have a FreeBSD file server with ZFS managing disks. However, I need other VMs for e.g. a shell/git server, mail server etc. I'm wondering how to deal with the following issues: I want ZFS to fully manage the disks, so I'm not using any hardware RAID. Should I pass the SAS controller directly to the FreeBSD system as passthrough PCI? I want to maximize the reliability of the setup. On what disks should I install the hypervsor and keep server system disks? For (2) I have the option of having a RAID setup on the SAS controller and using that as system disk to store the hypervisor as well as VM images. However, this makes PCI passthrough to the file server impossible. Another option is using the two 2.5" bays. In terms of reliability how are SSDs compared to e.g. WD RE4 disks? Would it make sense to have two SSDs in software RAID as boot disks for the hypervisor or should I just go with e.g. WD RE4 disks in a software RAID setup. I also need to think about where to store the mails for the mail server, but this could be done over NFS between the VMs. BTW, this is for home use, so the load is not really that big. What I'm looking for is best practices for splitting up a server.

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• How can I write directly to my Zune HD hard drive?

  - by iamgoat

  When syncing photos to the Zune HD it resizes them down to a much lower resolution which means I cannot load a high res picture on it (comic book) and zoom in to read it. This defeats the whole purpose of having a zoom feature. There is a registry hack you can make to get the Zune to display under My Computer. Then if you killed the zune process while it's syncing you'd be able to access it like a hard drive and copy files to it. It seems like the more recent firmware and/or Zune software version now prevents this. How can I treat it like an HDD and copy files to it? I simply want to take my original pictures folder and copy it over the low resolution versions the Zune software resized it to. An alternative option would be to remove the hard drive from it and see if I can connect it to a computer directly, but I just got this and don't want to disassemble it yet. Note to Microsoft: Why do you allow me to set the encoding quality of music, but not photos?

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• Excel chart with year-to-year comparison

  - by Craig

  Given this data: Date Year Month Usage (Kw-h) Cost/Month 02/19/08 2008 2 501 59.13 03/18/08 2008 3 404 48.49 04/16/08 2008 4 387 45.67 05/22/08 2008 5 319 37.85 06/23/08 2008 6 363 43.81 07/23/08 2008 7 372 48.86 08/21/08 2008 8 435 59.74 09/23/08 2008 9 358 49.9 10/16/08 2008 10 313 42.01 11/20/08 2008 11 328 39.99 12/16/08 2008 12 374 44.7 01/20/09 2009 1 474 55.35 02/19/09 2009 2 444 52.85 03/19/09 2009 3 398 49.25 04/17/09 2009 4 403 51.05 05/19/09 2009 5 405 49.61 06/18/09 2009 6 373 45.18 07/20/09 2009 7 337 44.67 08/18/09 2009 8 369 50.73 09/17/09 2009 9 377 52.36 10/16/09 2009 10 309 43.4 11/17/09 2009 11 249 34.14 12/16/09 2009 12 327 41.79 01/20/10 2010 1 356 45.66 I would like to produce a report that displays a Usage (Kw-h) line for each year. Features: Y axis: Usage (Kw-h) X axis: Month Line 0..n: lines representing each year's monthly Usage (Kw-h) Bonus points: instead of a line for each year, each month would have a high-low-close (HLC) bar; 'close' would be replaced by the average second Y axis and HLC bar that represents cost/month Questions: Can this be done without a Pivot table? Do I need to have the Year and Month column or can Excel automatically determine this? Current chart:

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• Windows memory logged on vs logged off

  - by Adi

  Let's say I power on my fresh installed Windows 7 x64 machine. After Windows boots up, there are a bunch of services being started in the background that start allocating memory. Then I enter my user/pass and Windows logs me in. Let's supose I don't do anythig else (I don't explicitely start any application) and I don't have any other app installed by me. So it's fresh install of my machine. My question is: how much memory is needed for all the UI & other stuff? Is it a good indicator to look into task manager and check all the processes started under my user name and sum up all the memory consumed by those processes to get the total amount of memory I am consuming just to stay logged on? Basically this is my question: how much memory is needed just to stay logged on? Now, if log off would all the memory be released back to the system so that the background services can benefit of? Also, I assume that there might be a different discussion for each Windows flavors (?)

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• Can't get past bootcamp Windows logo, freezes immediately after picking boot partition -- Windows 7

  - by cksubs

  Hi, I had a fine install of Windows 7 alongside Snow Leopard. I had a power outage, and Windows restarted. When I booted via the "Hold Option" sceen, it started hanging at the grayscale "Windows logo" (squares) that comes up after picking the Windows drive from the bootcamp loader (the Windows version of the grayscale Apple logo when OS X loads). I think this happened once before, and installing rEFIt helped. I did that, but it continued to hang at the same point. I finally got fed up with it and erased the Windows partition via Disk Utility. I then reinstalled Windows 7 x64 from DVD to the fresh partition. Seemed fine. Ran Windows Update then restarted. FFFFFFFFF. Hangs in the same place. What can I do? Like I said, I already have rEFIt installed. Booting the Windows 7 install CD results in the same infinite loading error. I don't have a spare Snow Leopard disk handy.

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• Disabling drop shadows around windows or the menu bar

  - by Lri

  Nocturne can disable most shadows, but only in night mode. There's an annoying flash whenever it switches to night mode. (Eg when it's launched.) Also, it doesn't remove the shadow on the menubar. Sympa at MacThemes forums has posted a .psd file with a layer that cancels out the shadow under the menu bar. However it only works if that area of the desktop picture has a low enough brightness. Applications that cover the desktop (like DeskShade) also cover the menu bar's shadow. It's not a real solution though. Unsanity's ShadowKiller stopped working in 10.5. (The website still says NOT compatible with Mac OS X 10.6 Leopard. ;)) WindowShade X doesn't have any shadow-tweaking features anymore. Being able to decrease the shadow radius would be fine as well. osx - How do I decrease the window shadow in Mac OS X? - Super User doesn't have any solutions though. No, I don't mean defaults write com.apple.screencapture disable-shadow -bool yes. This seems like something that might just be possible without any extra applications. Or at least something that other applications besides Nocturne should support. So does anyone know any better solutions?

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• HP Proliant DL380 G4 - Can this server still perform in 2011?

  - by BSchriver

  Can the HP Proliant DL380 G4 series server still perform at high a quality in the 2011 IT world? This may sound like a weird question but we are a very small company whose primary business is NOT IT related. So my IT dollars have to stretch a long way. I am in need of a good web and database server. The load and demand for a while will be fairly low so I am not looking nor do I have the money to buy a brand new HP Dl380 G7 series box for $6K. While searching around today I found a company in ATL that buys servers off business leases and then stripes them down to parts. They clean, check and test each part and then custom "rebuild" the server based on whatever specs you request. The interesting thing is they also provide a 3-year warranty on all their servers they sell. I am contemplating buying two of the following: HP Proliant DL380 G4 Dual (2) Intel Xeon 3.6 GHz 800Mhz 1MB Cache processors 8GB PC3200R ECC Memory 6 x 73GB U320 15K rpm SCSI drives Smart Array 6i Card Dual Power Supplies Plus the usual cdrom, dual nic, etc... All this for $750 each or $1500 for two pretty nicely equipped servers. The price then jumps up on the next model up which is the G5 series. It goes from $750 to like $2000 for a comparable server. I just do not have $4000 to buy two servers right now. So back to my original question, if I load Windows 2008 R2 Server and IIS 7 on one of the machines and Windows 2008 R2 server and MS SQL 2008 R2 Server on another machine, what kind of performance might I expect to see from these machines? The facts is this series is now 3 versions behind the G7's and this series of server was built when Windows 200 Server was the dominant OS and Windows 2003 Server was just coming out. If you are running Windows 2008 R2 Server on a G4 with similar or less specs I would love to hear what your performance is like.

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• Windows Firewall Software to Filter Transit Traffic

  - by soonts

  I need to test my networking code for Nintendo Wii under the conditions when some specific Internet server is not available. Wii is connected to my PC with crossover ethernet cable. PC has 2 NICs. PC is connected to hardware router with ethernet cable. The hardware router serves as NAT and has an internet connected to its uplink. I set the Wii to be in the same lan as PC by using Windows XP Network bridge. I can observe the WII network traffic using e.g. Wireshark sniffer. Is there a software firewall that can selectively filter out transit traffic? (e.g. block outgoing TCP connections to 123.45.67.89 to port 443) I tried Outpost Pro 2009 and Comodo. Outpost firewall blocks all transit traffic with it's implicit "block transit packet" rule. If the transit traffic is explicitly allowed by creating the system-wide low level rule, then it's allowed completely and no other filter can selectively block it. Comodo firewall only process rules when the packet has localhost's IP as either source or destination, allowing the rest of the traffic. Any ideas? Thanks in advance! P.S. Platform is Windows XP 32 bit, no other OSes is allowed, Windows ICS (Internet Connection Sharing) doesnt work since the Wii is unable to connect, becides I don't like the idea of adding one more level of NAT.

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• Website has become slower on a VPS, was much fast on a shared host. What's wrong?

  - by Arpit Tambi

  My shared host suspended my website stating system overload, so I moved my website to a VPS which has 4GB RAM. But for some reason the website has become very slow. This is the vmstat output - procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------ r b swpd free buff cache si so bi bo in cs us sy id wa st 1 0 0 3050500 0 0 0 0 0 1 0 0 0 0 100 0 0 Here's the Apache Benchmark output for a STATIC html page I ran on the server itself - Benchmarking www.ask-oracle.com (be patient)...apr_poll: The timeout specified has expired (70007) Total of 20 requests completed Update: Server Config: List item Centos 5.6 4 cores cpu 4 GB RAM LAMP stack with APC Wordpress Only one website It takes almost double time to load now, same website was much fast on shared hosting. I know I need to tweak some settings but have no clue where to start from? I have already tried to optimize apache, mysql etc. Update 2: CPU usage is low, see uptime output: 11:09:02 up 7 days, 21:26, 1 user, load average: 0.09, 0.11, 0.09 Update 3: When I load any webpage, browser shows "Waiting" for a long time and then page loads quickly. So I suspect server can accept only limited connections and holds extra connections in a waiting state. How to check this? Update 4: Following is the output on executing netperf TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to localhost.localdomain (127.0.0.1) port 0 AF_INET Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 16384 10.00 9615.40 [root@ip-118-139-177-244 j3ngn5ri6r01t3]# Here are the Apache MPM settings from httpd.conf, do they look okay? <IfModule worker.c> StartServers 5 MaxClients 100 MinSpareThreads 50 MaxSpareThreads 250 ThreadsPerChild 125 MaxRequestsPerChild 10000 ServerLimit 100 </IfModule>

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• Is there a way to run CUDA applications with the CUDA device being a secondary adapter?

  - by Slartibartfast

  I've been trying to run a CUDA program on a remote computer which has Windows 7 installed. The GPU is GeForce GTX 480. One of the problems I've been facing is that, the computer has two adapters, 1) Standard VGA Adapter 2) NVIDIA GeForce GTX 480 Even though this shows in the device manager. The desktop uses the standard VGA Adapter. I'm assuming this is because the Standard VGA is the primary adapter. Also the device manager shows that the monitor is connected to the standard VGA Adapter. In this scenario if i try to run any CUDA application it fails to recognise a CUDA capable device. Is it necessary for the NVIDIA adapter to be the primary one? Or is there any way to use CUDA when the graphics card is a secondary adapter. I've seen a few posts in the NVIDIA forums on this before, one suggests using another low cost NVIDIA card as the primary adapter, but that is currently not an option. I couldn't find any other solutions. Thanks I tried running the deviceQuery test from the NVIDIA GPU Computing Samples. This was the result i obtained CUDA Device Query (Runtime API) version (CUDART static linking) cudaGetDeviceCount FAILED CUDA Driver and Runtime version may be mismatched FAILED The driver version I'm using is 263.06. The CUDA version is 3.2 I ran the same test on my desktop which also has windows 7 and a GeForce GTX 465. The CUDA toolkit version is 3.2. The driver version was the same and the test passed, although it failed with an older driver.

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• If I partition a drive connected via eSata will it show different partitions when connected via USB?

  - by jeffreypriebe

  I have an odd problem with an external drive. I'm formatting it connected to my laptop prior to connecting it to my router. The HDD enclosure has both an eSata and USB connections. Generally, I connect it via eSata to my laptop. I created my partitions and connected it to the router, but I see partition information that is different than what I created. After chasing leads concerning large HDD size, I mindlessly connected the HDD to my laptop with USB. Lo! I see the same partitions as the router. Attached are screenshots using the same program and the HDD in question. The only difference is the connection. For the first, I connected via eSata and hit "refresh" on the partition program. Then, turned off the HDD, disconnected the eSata cable, and connected via USB. Power and refresh. eSata: reports a total HDD size of 2328 GB, with four partitions (the third being 1.96TB) USB: reports a total HDD size of 280 GB, with three partitions (the third being 279 GB) Any idea why this is happening? It looks like it clearly is an issue of the 4K sector size and not playing nice with the USB enclosure. I tried it eSata and USB in Windows and Linux and it appears consistently that eSata is reporting correctly, USB incorrectly.

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• Finding useful crash-information in Windows 8 Consumer Preview

  - by Lukas Knuth

  I'm currently diving into C# and wanted to play around with the new Metro-styled-applications introduced with Windows 8, so I updated my Windows 7 to Windows 8 Consumer Preview. The problem I'm facing right now is, that the system freezes after 3-5 minutes. It does not take any input from the keyboard or mouse and it does not recover (at least not in less then 10 minutes). Since I have a background in Linux, I'd like to find some information about the cause of the freeze, but I have no idea where to search. I checked the system-logs (under "System Control" - "Management") but they only record that the system was shut down unexpectedly (doe to the face that I held down the power-button to reboot the PC). There is no useful crash-information in there. I don't want to spend hours on randomly reinstalling drivers and doing things that "might help". Isn't there any place I can find some useful information about the freeze? Before you ask: I installed Windows 8 as an updated on my old Windows 7 installation (which worked fine by the way). My hardware fits the minimum requirements (specs can be found here, the MacMini 3,1 model with 2GHz processor). I have updated the graphics-card drivers to the newest Windows 8 drivers from nVidia.

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• repo sync "CyanogenMod/android_prebuilt" size and resume capability.?

  - by james

  I'm downloading CyanogenMod-10.1 source on a low speed broadband. About 4GB of source is downloaded . In that 4GB, there is a big project "CyanogenMod/android_frameworks_base" which alone took 1GB of download without any interruption. Ok now, after 4GB of download, my internet got disconnected and I had to stop (ctrl + z) repo sync while it was downloading the project "CyanogenMod/android_prebuilt". Before I stopped repo sync the android_prebuilt got downloaded till 250MB and is at 42percent. I checked the working folder and there is a file "tmp_pack_df5CKb" of size 250MB in the path "$WORKING_DIR/.repo/projects/prebuilt.git/objects/pack/" . Then I restarted repo sync and it was downloading the android_prebuilt project. But I'm not sure if it was downloading from start or resuming from 250MB. While downloading this time , the previous "tmp_pack_df5CKb" isn't deleted and the content is being downloaded to a new file "tmp_pack_HPfvFG". I heard repo sync cannot be resumed for a project. But here, since the previous file isn't deleted I want to ask if android_prebuilt is resuming or downloading from start again? Now that my high speed internet is over (current speed 256kbps), I'm not sure if I can download the remaining ~4GB if single project is in size 500 MB.

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• Getting Dell E6320 with I7 to work with 3 monitors at 1920x1080p x 3

  - by MadBoy

  I want to buy Dell E6320 which comes with Intel Core I7-2620M (2.70GHz, 4MB cache, Dual Core) with Intel HD Graphics 3000. Laptop will come with docking station. I want to connect 3 monitors to that docking station so that working at home would give me some additional boost. Docking station will allow me to connect only 2 monitors so I'm looking at following other options: Matrox TRIPLEHEAD2GO DIGITAL Edition or TRIPLEHEAD2GO DP Edition. But reading Matrox Support Page intel GPU can't run the highest resolution with 3 monitors connected, it even gets worse since it seems monitors would have to be able to work at 50hz. Also I'm not sure but it seems that Matrox doesn't split the monitors as 3 separate monitors but simply as one big space (which is a bit opposite to what I need) Buy 2 or maybe just 1 USB based monitor but it would also mean having 1 or 2 different monitors then the main one, unless I buy 3 USB based monitors which would mean more money to spend. Also I found only couple of models and most of them require USB 3.0 and no other cables to plug in (nice but costly - couldn't find decent monitor with only USB for sending signal and having power connected normally) . But docking station has only one USB 3.0 port. Can I use hub and still get it to work? Find some converters from Digital to USB (I think DisplayLink does some?) Buy different laptop but what kind? I need it to be I7, small (13"), fast and lightweight. At same time it requires docking station that I can use at home to connect 3 external monitors. Some other suggested solution... Edit: I need 3 monitors for work in terms of coding in Visual Studio or having word/excel/outlook open. Nothing fancy. Maybe some movie once in a while.

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• Using my old PC as a web/file server?

  - by Garrett

  I have an old desktop computer that I've been trying to sell for AGES. I guess nobody is looking for computers because it was advertised at a dirt cheap price on craigslist, local papers, etc. Anyways, I was wondering if it would be worth it to set it up as a home file server, a web dev server (I have a web host for actual production use), and maybe host a few server applications (ex: ventrillo). The computer is actually an old Dell that I cannibalized after the motherboard being destroyed by lightning, so it has fairly new parts in it. The specs are: P4 3.4GHz w/ HT and Artic Cooling Freezer 7 3GB DDR2 533 RAM 80GB hdd (will upgrade the hard drive if it's even worth using as a server) basic dvd rom 430 Watt Thermaltake PSU (it might be important to note that it is only 60% efficiency) ATI Radeon x600 256MB Antec 300 case It's not a really beefy machine, I just can't see giving it away or putting it in the corner to just collect dust. I have Windows Server 2008 R2 Standard and I am confident in my skills in operating most Linux operating systems. I'd also be using it to tinker with when I learn new things in my server admin classes (I'm finishing my 2nd year in college at the moment so I'm still learning) Also, my house is quite old and the electrical wiring is pretty poor (it MIGHT be up to code, then again, where I live most people don't even know what regulations are or let alone know how to spell it...) Would it be safe to leave it running all day and is it going to run up my electric bill because of the PSU efficiency? I only have 5mbit cable internet, but I won't be running very bandwidth intense services on it so it should be ok. I should elaborate on why I am concerned about the power. The circuits should be fine, but I'm more concerned about fire hazard. What is the likelihood that the server could cause an electrical fire? Again, thank you all for the feedback!

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• Setting up a Network Bridge on Linux VM (Windows 7 Host)

  - by GrandAdmiral

  I would like to use NetEm to simulate a low bandwidth environment while testing an Internet-connected device. My plan is to setup a bridge in a Linux VM (Linux Mint 13) on a Windows 7 host. Unfortunately I'm having trouble setting up the bridge. Then I can use NetEm in the Linux VM to limit the bandwidth to an external device. I went with the following script: ifconfig eth0 0.0.0.0 promisc up ifconfig eth1 0.0.0.0 promisc up Then create the bridge and bring it up: brctl addbr br0 brctl setfd br0 0 brctl addif br0 eth0 brctl addif br0 eth1 dhclient br0 ifconfig br0 up When I run that script, I see the following warning: Rather than invoking init scripts through /etc/init.d, use the service(8) utility, e.g. service smbd reload Since the script you are attempting to invoke has been converted to an Upstart job, you may also use the reload(8) utility, e.g. reload smbd The device connecting to the bridge is able to obtain an IP Address, but it can only ping the IP Address of the bridge (both are 10.2.32.xx). Then after a few minutes, other parts of our network go down. I'm not sure why, but once I kill the bridge the network is fine. Is it possible to setup a network bridge in a Linux VM? Do I need to do something else with the dhclient br0 part of the script? By the way, I'm using VirtualBox. The wired connection is eth0 and the wireless connection is eth1. The wired connection is connecting to the device and the wireless connection is going to the network. Both adapters are set up as bridged adapters with promiscuous mode set to "allow all".

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• Only half of RAM is recognized by BIOS

  - by Rick Crawford

  I got a Gigabyte GA-P35-DS3 mainboard. Some time ago I noticed that Windows only showed 2GB instead of 4GB. I don't know exactly what caused it anyway. I tried putting in each of the 4 x 1GB RAM modules one by one, and tried every slot one by one, until every stick and slot worked. However, then I tried adding one more at a time, and it kept showing 1GB, until I put in all 4, where it only showed 2 GB instead of 4 (in BIOS and windows 7 64bit). I tried replacing the BIOS battery since I've read that low battery could cause it. It didn't help though. I also bought 4GB new RAM (yes, it's supported, I checked it), and it's still the same, it only shows 2GB (or 3GB, when I put in 4 of the new and 2 of the old). I also did the latest BIOS update, and used default BIOS settings, but nothing of that helped. When my PC boots it shows "RAM modules used 2 and 3", when 4 sticks are in - or "0 and 1", when only 2 are in.

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• How to troubleshoot when one has no idea where to start?

  - by Chris Walton

  I am looking for hints, tips and answers on how to get started on troubleshooting when: The problem is intermittent The problem could lie literally anywhere - operating system; free source software; my own software developments; purchased software; crumbs on the keyboard; the specific combination of software I am currently running; Maxwell's demon; the little blue men actually running the machine have gone on strike; etc. I have expertise only in a few of the areas that are potential candidates for the cause of the problem. The specific problem I am having is detailed below as an example, but I am not seeking answers to my current problem, but rather where and how to start on tackling such problems. I am currently encountering a problem with my new machine. On a few occasions the machine has just frozen; not accepting keystrokes, mouseclicks, or anything except the power on/off switch. Invariably I have been merely browsing the web; I have had a few (<= 6 other applications) running. None of these applications are major; and represent a mix of commercial programs and open source programs, typically migrated from Unix of some variety. My machine is a Windows 7 I7 quad core laptop.

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• Running KVM/XEN/Hyper-V VMs from a RAM disk, is this possible? Practical?

  - by Ausmith1

  Currently I'm using ESX (v3 and v4) to test a scripted OS (Windows 2003) and application install DVD. The DVD ISO (8GB) is mounted on a 1Gbps NFS datastore and the VMDK's (20GB) are on an SSD mounted via NFS over a 10Gbps link. It still takes a lot longer than I'd really like for to run through a test iteration and I'm wondering if mounting the virtual disks and ISO on a RAM disk on the same server as the hypervisor is running on would be worth my while. I can dedicate a server to this VM and 32GB of RAM in the system should be adequate to do the trick I'd guess. (1GB hypervisor OS, 28GB RAM disk and 2GB for the VM is < the 32GB available to me) Since hosting a RAM disk within ESX does not seem possible I'm open to trying KVM/Xen/Hyper-V. KVM would probably be my first choice of these three. Anyone out there tried this? Bear in mind this is purely for a test run of the installer, the VM will be discarded as soon as the test is completed so I'm not worried about losing data from the remote possibility of a power failure.

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• MSSQL Timing out, a couple of questions...

  - by user29000

  Hi, About once a week, my MSSQL server is timing out, or rather the machine runs out of RAM. This morning it reached 3.9GB of the available 4, with MSSQL taking up 2.5GB. I'm concerned that i've not configured SQL to release memory as it should, so I ran sp_who2 while the timeouts were occuring to see what process were running. If i could post the CSV datafile i would, however, there were 85 processes in total, mostly related to the Full Text service: FT Gatherer - About 35 of these running under the 'sa' account against the master database with status of either sleeping or background, many were dependant on other processes. Is that normal? MySite database - There were only 5 processes for the one active site/database and all were either sleeping or suspended - but their lastBatch dates were set to 1/12/2020. Is that normal? The datbase is only about 20mb in size the traffic levels are very low, so i'm thinking of maybe limiting the amount of RAM SQL has access to (from unlimted to maybe 2GB). Any thoughts / advise would be appreciated. Mny thanks Ben

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• What was your biggest waste of money, and what should you have bought instead? [closed]

  - by rob

  I waste a lot of money on computer equipment and other electronics that I don't really need. I've also bought software that I've never really used, or which as been replaced by better free software. As I'm buying things, it doesn't seem like much--fifty bucks here, a hundred dollars there. But when I go back and look at how much I've spent over my past few electronics purchases, I usually start to think of the other things I could have bought with that money instead. Most of the computer hardware and electronics don't usually improve my life by much, if at all. Case in point: back when I was in college, I prided myself on getting the best deals for computer hardware, but when I went back and added up all the money I had spent, I had probably wasted close to a thousand dollars on "cheap" $100 hard drives that eventually all went bad (including the warranty replacements). Even if they did still work, it would not be worth the effort to use them, because they're too small and too noisy by today's standards. I've also spent thousands more on other junk, such as RAM and CPU upgrades that only gave modest performance jumps, and wireless audio transmitters that I used for a short time to stream music from the now-defunct Yahoo! Music service. Every time I see a really great deal on RAM or video cards, I come one click away from buying them, but these days I'm usually able to resist. I've been wanting to get into woodworking ever since I moved into my house, and five years later I'm finally saving up for a $600 table saw. Sure, I've already got a toolbox and a couple of the essential power tools like a drill and a jigsaw, but I can't help but think that I'd have an entire shop full of woodworking tools and a lot of nice wood furniture if I hadn't wasted all that money back in college. What has been your biggest waste of money on computer stuff and technology? If you had all that money back, would you make the same mistake again and buy the same types of things, or would you spend it on something else?

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