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• In general, do 3rd-party laptop AC adapters / chargers work reliably?

  - by MGOwen

  The AC adapters for my 2 dell laptops wore out very quickly. One supplies power but won't charge the battery (it's about 3 years old, the other is a bit newer). Both have worn through to the shielding around the notebook connector and look like they'll be unusable soon. Checking user reviews of the replacement adapter on Dell's own website, it appears they usually fail this fast. Apparently Dell does this deliberately to make money (their adapters sell for about 10-15 times what they cost to make). Same with replacement batteries. I can see there are plenty of much cheaper ($50 less) compatible AC adapters on eBay. Does anyone have experience with these? Naturally I'm nervous a crappy knock-off could fry my notebook, but has this ever actually happened to anyone recently? Has anyone had a good experience? Can anyone recommend a good online seller (who doesn't charge nonsensical shipping costs to Australia, preferably?)

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• Debian Linux server hangs after a week or so

  - by Alex Flo

  I have 2 Debian Linux 6.0.4 servers that have a strange behaviour: after 5-7-10 days they hang. By this I mean the servers need to be restarted and before that ping won't answer. I've been struggling with this problem for a couple of months now and here's some thoughts/what I tried without being able to solve the problem. I changed the RAM on a server. Being 2 different servers I doubt that it could be something related to hardware as a 3rd identical server won't have this problem. I logged the server load and when it crashes the load is fine (quite low) I cannot find anything in the server logs, logs are fine till the server freezes. I don't have access to console unfortunately. While I have years of admin experience I have never encountered such an issue and right now I have no idea where else to investigate. If you have an idea of what I could try in order to fix the problem please share it with me:-)

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• Distribute terrabyte files to the public from web server

  - by MarkJ

  Hi We need to set up a website which makes two or three large files publicly available - the files will be 1 or 2 terrabytes each. Although they will be public, in practise I expect only a relatively small number of scientists will want to download them. What is the best way to allow this? I've had a quick talk to a web-hosting provider (rackspace) and they suggested a hybrid solution. An entry-level managed server (we predict fairly low traffic for the website, but we do need to install some custom CGI software). Some cloud storage which hooks into Limelight Networks. This would host the large files, for download by FTP. It sounded OK to me but I know relatively little about server administration. Does it make sense? Thanks in advance, Mark

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• My KDE very slow in certain operations

  - by Pietro

  I have a problem with my Linux installation. It seems that the KDE code that deals with directory windows is extremely slow (on both Dolphin and Konqueror). This happens both when I click on a directory icon and when I want to open/save a file from many KDE applications. The time the window takes to open can be one minute or more. The same happens when I right click on an icon. Looking at the CPU usage, this is very low (less than 10%). Am I the only one with this problem, or is it well known and maybe already fixed? Consider that I cannot update to a more recent version of OpenSuse. Thank you, Pietro Configuration: Linux version: OpenSuse 11.4 KDE 4.6.0 System: DELL Precision T3500 - Intel Xeon Home directory mounted on a remote drive. <-- could this be the reason?

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• Plug and Go NAS Storage

  - by graham.reeds

  My wife and I are separating. One of the things we need to extricate is the media we have accumulated over the years. So I am looking for a NAS solution that is a) relatively low-cost, b) reliable and c) easy for a non-geek to use (I don't want to be tech support). All it needs to do is hold our iTunes library, photos, course work and maybe some movies and TV shows that I currently have. She will be connecting via her Netbook. I have seen this thread but the reviews on Amazon aren't particularly favourable. Due to the need for simplicity, WHS and FreeNAS are none-starters. I need redundancy as if a single drive system was to die then she would lose her course work and photos. Is the ReadyNAS the only real solution out there?

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• What can cause peaks in pagetables in /proc/meminfo ?

  - by Fuzzy76

  I have a gameserver running Debian Lenny on a VPS host. Even when experiencing a fairly low load, the players start experiencing major lag (ping times rise from 50 ms to 150-500 ms) in bursts of 3 - 10 seconds. I have installed Munin server monitoring, but when looking at the graphs it looks like the server has plenty of CPU, RAM and bandwidth available. The only weird thing I noticed is some peaks in the memory graph attributed to "page_tables" which maps to PageTables in /proc/meminfo but I can't find any good information on what this might mean. Any ideas what might be causing this? If you need any more graps, just let me know. The interrupts/second count is at roughly 400-600 during this period (nearly all from eth0). The drop in committed was caused by me trying to lower the allocated memory for the server from 512MB to 256MB, but that didn't seem to help.

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• XenServer/Center: Shared SRs for hosts not in same pool?

  - by 3molo

  I would like to use the same SRs on XenServer hosts that are not able to be part of the same pool (because of not having the exact same cpu feature set, if I understand it correctly) in order to share templates, being able to (manually) start a host on another node, backing up running hosts on other hardware etc etc. The technology for SR can be any of iSCSI, NFS or CIFS, iSCSI would obviously be preferred. Trying to add an iSCSI volume renders a "This LUN is already in use as SR iSCSI - Shared Storage on pool xxxxxx.". Adding a NFS share on one XS host, creating a template there and then checking another XS host reveals they don't agree on used space etc. Coming from a vSphere world this is quite baffling, but if these are limitations then I will have to rethink some of the concepts for this low budget project.

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• Performance problems on RDC to our Terminal-Server Win2008 R2

  - by user40021

  Hello, we have a new win2008-R2 (2x Xeon X5570, 32GB RAM). There I have installed the terminal-server roles, thats all OK. Currently 5 users are working at this server, but all get a very low performance in their remote-desktop session. Sometime it takes 1-2 seconds till the keyboard-inputs will be performed and shown. At the clients I run RDP v 6.1 We have also an older TS-server (based on Win2003 with an Opteron-CPU), there are working about 20 users at the same time. There I do not have the troubles with the inputs at the remote-desktop sessions. Both servers are connected to the same gigabit-switch. Any ideas what could cause the troubles at the Win2008 R2? Many thanks in advance. Regards Chris

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• Can I increase the link speed of the RAS Server on our MS Win2k3 box?

  - by Ducain

  We are running a Win2K3 Server box, and I'm a remote employee that connects via VPN. I've been frustrated for some time by the connection speed over the VPN (the office HQ has a decent speed and I have a biz class connection here), and decided to do some checking today. This morning, I was dialed in and looked at the networking tab of the task manager, and I see that the adapter for the RAS Server (the box has 4 Gigabit adapters) has a speed that seems far too low. The speed for the RAS Server link hovers between 300 - 600 Kbps. The local connection (and others) all say 1 Gbps. Can I set this to a higher speed? Is this information accurate? Thanks for the input.

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• Radeon hd 6570 black screen

  - by Sho

  I got some problem with new graphic card. Every time I use AMD Catalyst drivers on Windows or Linux, screen repeatedly goes black. This usually shows u when i open new cards in a browser, resize a window or run a program. Card runs smoothly on basic drivers but this means low resolution. 1940x1080 is native for my monitor so it causes a lot of problems. I've got a 600W Deus G1, so the power is not the problem. Maybe its a silly question, but would going form a vga cable to hdmi help to improve this situation? If not, can it be caused by slow processor or old mainboard? Im getting kinda confused about this whole thing...

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• Should I split my website into different servers

  - by Nyxynyx

  I have a website where a user uploads photos, the photos gets resized and thumbnailed, and stored on the server. At the same time, there are some INSERTS into a MySQL table regarding the photo uploaded (like description, user id etc). The site currently runs off a managed VPS, and I love the support it provides. However it is expensive to store the many small photos and the resizing and thumbnailing processes do cause spikes on the app performance. (Amazon S3 is pretty expensive, especially considering the costs for uploading many small files) Question: Will it be a good idea to move the image processing operations and image storage to another server which is an unmanaged dedicated server with a much lower cost/gb and keep the current VPS for its 24/7 support and hosting the webapp? Or should I move the entire site to the dedicated server? VPS Specs 16 cores 2.4GHz (E5620) 1GB memory 60GB Storage 3.5TB transfer $43/mth Managed (24/7) Dedicated Specs i3 2130 2 cores 3.4+ GHz 16 GB DDR3 2 x 1TB SATA2 storage 15 TB transfer $79/mth Unmanaged (Weekdays support) Software used Apache PHP MySQL Solr PostgreSQL ImageMagick

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• What can I do to enhance MacBook Pro internal mic sound quality in iMovie?

  - by gaearon

  After using MacBook for two years, I bought 17'' MacBook Pro. I'm pretty happy with it, performance and all, but I also was going to record some music videos for YouTube. I play guitar and sing. However I was extremely disappointed with the sound quality that comes by default. I'm 100% sure my 13'' MacBook mic was much better at recording music and singing. Currently mic can't event handle acoustic guitar, outputting sound you'd think was recorded 5 years ago in ARM format on a Nokia phone on a loud concert. It totally feels like some lame filter is cutting low and high frequencies. I want to know what settings (visible or hidden) in iMovie or Mac OS itself I might want to tweak in order to get my MBP mic record clean sound.

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• xen domUs crashes or unavailability

  - by Rush

  I've xen server with 8 domU. Server is Xeon E31270 with 16gb ram. I think it is enough for 8 machines. Sometimes domU's crashes and i can't figure out the reason. After crash i can connect to console and there is somthing like this: Oct 8 22:20:49 server kernel: [30892.320780] lowmem_reserve[]: 0 0 0 0 Oct 8 22:20:49 server kernel: [30892.320790] Node 0 DMA: 10*4kB 3*8kB 13*16kB 10*32kB 7*64kB 3*128kB 2*256kB 2*512kB 1*1024kB 2*2048kB 0*4096kB = 8080kB Oct 8 22:20:49 server kernel: [30892.320817] Node 0 DMA32: 648*4kB 2*8kB 1*16kB 0*32kB 1*64kB 0*128kB 0*256kB 0*512kB 1*1024kB 1*2048kB 0*4096kB = 5760kB Oct 8 22:20:49 server kernel: [30892.320842] 1491 total pagecache pages Oct 8 22:20:49 server kernel: [30892.320847] 0 pages in swap cache Oct 8 22:20:49 server kernel: [30892.320852] Swap cache stats: add 0, delete 0, find 0/0 Oct 8 22:20:49 server kernel: [30892.320858] Free swap = 0kB Oct 8 22:20:49 server kernel: [30892.320862] Total swap = 0kB Oct 8 22:20:49 server kernel: [30892.324024] 524288 pages RAM Oct 8 22:20:49 server kernel: [30892.324024] 11010 pages reserved Oct 8 22:20:49 server kernel: [30892.324024] 424467 pages shared Oct 8 22:20:49 server kernel: [30892.324024] 503538 pages non-shared Oct 8 22:20:49 server kernel: [30892.330308] apache2 invoked oom-killer: gfp_mask=0x200da, order=0, oom_adj=0 Oct 8 22:20:49 server kernel: [30892.330322] apache2 cpuset=/ mems_allowed=0 Oct 8 22:20:49 server kernel: [30892.330330] Pid: 23938, comm: apache2 Not tainted 2.6.32-5-xen-amd64 #1 Oct 8 22:20:49 server kernel: [30892.330337] Call Trace: Oct 8 22:20:49 server kernel: [30892.330349] [<ffffffff810b7180>] ? oom_kill_process+0x7f/0x23f Oct 8 22:20:49 server kernel: [30892.330358] [<ffffffff810b76a4>] ? __out_of_memory+0x12a/0x141 Oct 8 22:20:49 server kernel: [30892.330367] [<ffffffff810b77fb>] ? out_of_memory+0x140/0x172 Oct 8 22:20:49 server kernel: [30892.330376] [<ffffffff810bb59c>] ? __alloc_pages_nodemask+0x4e5/0x5f5 Oct 8 22:20:49 server kernel: [30892.330385] [<ffffffff810cc224>] ? do_wp_page+0x386/0x707 Oct 8 22:20:49 server kernel: [30892.330395] [<ffffffff8100c3a5>] ? __raw_callee_save_xen_pud_val+0x11/0x1e Oct 8 22:20:49 server kernel: [30892.330404] [<ffffffff8100c369>] ? __raw_callee_save_xen_pmd_val+0x11/0x1e Oct 8 22:20:49 server kernel: [30892.330412] [<ffffffff810cdfc7>] ? handle_mm_fault+0x7aa/0x80f Oct 8 22:20:49 server kernel: [30892.330422] [<ffffffff8130f906>] ? do_page_fault+0x2e0/0x2fc Oct 8 22:20:49 server kernel: [30892.330433] [<ffffffff8130d7a5>] ? page_fault+0x25/0x30 Oct 8 22:20:49 server kernel: [30892.330439] Mem-Info: Oct 8 22:20:49 server kernel: [30892.330443] Node 0 DMA per-cpu: Oct 8 22:20:49 server kernel: [30892.330450] CPU 0: hi: 0, btch: 1 usd: 0 Oct 8 22:20:49 server kernel: [30892.330463] CPU 1: hi: 0, btch: 1 usd: 0 Oct 8 22:20:49 server kernel: [30892.330466] Node 0 DMA32 per-cpu: Oct 8 22:20:49 server kernel: [30892.330469] CPU 0: hi: 186, btch: 31 usd: 0 Oct 8 22:20:49 server kernel: [30892.330472] CPU 1: hi: 186, btch: 31 usd: 60 Oct 8 22:20:49 server kernel: [30892.330476] active_anon:342076 inactive_anon:115398 isolated_anon:0 Oct 8 22:20:49 server kernel: [30892.330477] active_file:268 inactive_file:481 isolated_file:0 Oct 8 22:20:49 server kernel: [30892.330477] unevictable:1125 dirty:2 writeback:13 unstable:0 Oct 8 22:20:49 server kernel: [30892.330478] free:3410 slab_reclaimable:1718 slab_unreclaimable:6946 Oct 8 22:20:49 server kernel: [30892.330478] mapped:899 shmem:113 pagetables:35697 bounce:0 Oct 8 22:20:49 server kernel: [30892.330502] Node 0 DMA free:8036kB min:32kB low:40kB high:48kB active_anon:1144kB inactive_anon:1268kB active_file:8kB inactive_file:8kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:11792kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:224kB kernel_stack:16kB pagetables:1228kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no Oct 8 22:20:49 server kernel: [30892.330518] lowmem_reserve[]: 0 2004 2004 2004 Oct 8 22:20:49 server kernel: [30892.330523] Node 0 DMA32 free:5604kB min:5708kB low:7132kB high:8560kB active_anon:1367160kB inactive_anon:460324kB active_file:1064kB inactive_file:1916kB unevictable:4500kB isolated(anon):0kB isolated(file):0kB present:2052320kB mlocked:4500kB dirty:8kB writeback:52kB mapped:3600kB shmem:452kB slab_reclaimable:6872kB slab_unreclaimable:27560kB kernel_stack:3528kB pagetables:141560kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:992 all_unreclaimable? no Oct 8 22:20:49 server kernel: [30892.330539] lowmem_reserve[]: 0 0 0 0 Oct 8 22:20:49 server kernel: [30892.330544] Node 0 DMA: 1*4kB 2*8kB 13*16kB 10*32kB 7*64kB 3*128kB 2*256kB 2*512kB 1*1024kB 2*2048kB 0*4096kB = 8036kB Oct 8 22:20:49 server kernel: [30892.330579] Node 0 DMA32: 609*4kB 2*8kB 1*16kB 0*32kB 1*64kB 0*128kB 0*256kB 0*512kB 1*1024kB 1*2048kB 0*4096kB = 5604kB Oct 8 22:20:49 server kernel: [30892.330605] 1522 total pagecache pages Oct 8 22:20:49 server kernel: [30892.330610] 0 pages in swap cache Oct 8 22:20:49 server kernel: [30892.330615] Swap cache stats: add 0, delete 0, find 0/0 Oct 8 22:20:49 server kernel: [30892.330621] Free swap = 0kB Oct 8 22:20:49 server kernel: [30892.330625] Total swap = 0kB Oct 8 22:20:49 server kernel: [30892.333018] 524288 pages RAM Oct 8 22:20:49 server kernel: [30892.333018] 11010 pages reserved Oct 8 22:20:49 server kernel: [30892.333018] 424367 pages shared Oct 8 22:20:49 server kernel: [30892.333018] 503658 pages non-shared Seems like there isn't enough memory for this domU. But there is no any memory problems reported in munin monitoring: As you see system uses around 0.2G and 1G is available. So my question is: Is it xen specific problem, that real memory usage and memory usage that shows munin are different (I've never seen such problems oh real hardware machines)? Or maybe it is just monitoring problem, that can't catch moment when there is unusual high load and domU go down? And how I can to defeat this problem? it is really annoying to catch messages in e-mail that domU went down. Btw, such situation was when domU had 2G memory.

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• How do I install and run Tomcat on port 80 as my only web server? (Rooted Ubuntu box)

  - by gav

  Hi All, tl;dr - I have a rooted linux box that I want to run tomcat on as a server (No Apache Web Server) how would you set this up avoiding common security pitfalls? I've written a Grails App that I want to run on a VPS I rent. The VPS has very little memory and I am using it for the sole purpose of running this application so I don't need the apache web server. This is my first venture into Server administration and I'm sure to fall into some well known traps. Should I use iptables to redirect requests from port 80 to 8080? Should I run tomcat as root or as it's own user? What configuration settings would be good for a low memory system expecting less than 10 concurrent users? Hopefully an easy one for you! Anyone who could link to a tutorial would be a personal hero destined for great things no doubt. Gav

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• Ad Agency storage/file server +backup needed (NAS or something else?)

  - by Rob

  Looking for a "this is all you need" recommendation. We're a small ad agency with both mac & pcs that access and share files from a 3 yr old Windows 2000 box (no server software). We currently have 1TB on the "server" and back it up to 2 different Seagate Free Agent Pro 1TB external drives. But we're low on space and are looking for something that's bigger, that we can still access from Mac & PC, EASY backup system, secure from viruses, firewall enabled. Not sure if a NAS will work or if we should have a real server. We don't really get on that box except to restore files, or run Norton on it. I hope I've provided enough for a general recommendation. Thanks. Rob Phx

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• Recommending simple appliance for DansGuardian, iptables, snort inline

  - by SRobertJames

  I'm currently using a Linksys E2000 with dd-wrt. I'd like to add DansGuardian for Content Filtering and snort-inline for IPS; but those require a more powerful box (mainly, more storage). Can you recommend a good device to use? I'm open to both overwrite-the-firmware (like dd-wrt) and designed-to-be-customized boxes. Requirements: 1. 5+ Ethernet ports, pref. GigE 2. small form factor 3. No noise (office environment) 4. low power 5. Not sure about 802.11 wireless Budget < $400, pref. less.

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• How long to erase flash memory (RAID controller)?

  - by Rob Nicholson

  I made a bit of a boo boo last night in upgrading the BIOS in a Silicon Image Sil3132 eSATA adapter. It's a RAID controller in a server. I accidently flashed it with the wrong BIOS ;-) Not the end of the world as this card only cost £15 but I'm trying to flash it with the correct BIOS as it won't obviously work anymore. Silicon Image supply a DOS program for flashing and I thought I'd use the Erase function to get rid of the old BIOS. Any idea how long this should take? It's been sat at the "Erasing memory" prompt for about 15 minutes. Thanks, Rob.

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• High level command line program for burning CDs and DVDs?

  - by stickmangumby

  I'm sick of screwing around trying to script a clean solution to burn multiple files and folders to CDs and DVDs with wodim, growisofs and genisoimage. I'm looking for a high level command line program that uses sensible defaults and takes arguments something like this: [program-name] [cd|dvd] /path/to/dir1/ /path/to/dir2/ /path/to/file ... It should then do all the low level copying and ISO generation transparently and just burn the damn disk! Does anyone have any suggestions? I've looked at several programs but it seems there are too many choices to trawl through and not enough information about them online. Thanks :)

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• How much HDD space would I need to cache the web while respecting robot.txts?

  - by Koning Baard XIV

  I want to experiment with creating a web crawler. I'll start with indexing a few medium sized website like Stack Overflow or Smashing Magazine. If it works, I'd like to start crawling the entire web. I'll respect robot.txts. I save all html, pdf, word, excel, powerpoint, keynote, etc... documents (not exes, dmgs etc, just documents) in a MySQL DB. Next to that, I'll have a second table containing all restults and descriptions, and a table with words and on what page to find those words (aka an index). How much HDD space do you think I need to save all the pages? Is it as low as 1 TB or is it about 10 TB, 20? Maybe 30? 1000? Thanks

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• Recover data from phyiscally 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: Picture of damage 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 phyiscally 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.

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• Setting up SharePoint 2010 guides

  - by RobertPitt

  I'm looking for some guides on setting up SharePoint Server 2010. The guides should be focused on the actual web interface side of things such as Permissions, Layouts, Team Sites etc. I have searched high and low for guides and most of them are just "How to install Server 2010". These are useless because the installation is self explanatory. I'm at the stage where I need to learn the config side of things so I can lay my web structure out the way I want it. Has anyone got any good resources?

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• Killing CLOSE_WAIT sockets without killing parent process on Linux

  - by Alex Neth

  Tomcat is leaving me with CLOSE_WAIT sockets which ultimately saturate the maximum number of connections. I've tried many methods in my client and server code to get rid of these to no avail, including closing connections, calling System.gc(), etc. Now I'm trying to find a way to simply time these out quickly in the OS. I've got conntrack working, but am not sure how to use that to kill these connections. I've also set /proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_close_wait to 1, which of course is too low but the connections persist. Is there a way to kill these zombie sockets? Running Ubuntu.

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• Best configuration and deployment strategies for Rails on EC2

  - by Micah

  I'm getting ready to deploy an application, and I'd like to make sure I'm using the latest and greatest tools. The plan is to host on EC2, as Heroku will be cost prohibitive for this application. In the recent past, I used Chef and the Opscode platform for building and managing the server infrastructure, then Capistrano for deploying. Is this still considered a best (or at least "good") practice? The Chef setup is great once done, but pretty laborious to set up. Likewise, Capistrano has been good to me over the past several years, but I thought I'd take some time to look around and seeing if there's been any landscape shifts that I missed.

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• perfmon reporting higher IOPs than possible?

  - by BlueToast

  We created a monitoring report for IOPs on performance counters using Disk reads/sec and Disk writes/sec on four servers (physical boxes, no virtualization) that have 4x 15k 146GB SAS drives in RAID10 per server, set to check and record data every 1 second, and logged for 24 hours before stopping reports. These are the results we got: Server1 Maximum disk reads/sec: 4249.437 Maximum disk writes/sec: 4178.946 Server2 Maximum disk reads/sec: 2550.140 Maximum disk writes/sec: 5177.821 Server3 Maximum disk reads/sec: 1903.300 Maximum disk writes/sec: 5299.036 Server4 Maximum disk reads/sec: 8453.572 Maximum disk writes/sec: 11584.653 The average disk reads and writes per second were generally low. I.e. for one particular server it was like average 33 writes/sec, but when monitoring in real-time it would often spike up to several hundreds and also sometimes into the thousands. Could someone explain to me why these numbers are significantly higher than theoretical calculations assuming each drive can do 180 IOPs? Additional details (RAID card): HP Smart Array P410i, Total cache size of 1GB, Write cache is disabled, Array accelerator cache ratio is 25% read and 75% write

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• Capture documents in bitonal, or grayscale then downsample

  - by Jason R. Coombs

  I'm about to embark on a document archival process. I'm going to spend a lot of good money to archive some paper (actually microfiche) to TIFF images. I have a choice of 300-dpi bitonal (2-bit, black/white) or 300-dpi grayscale (8-bit). Cost is the same for either format. Data volume (and thus image size) is not a factor. It seems to me that the grayscale, since scanned at the same resolution as the bitonal, would always contain more information and could always be downsampled to the equivalent bitonal image. Are there any downsides to selecting grayscale, and then later downsampling to bitonal if desired? In other words, is it possible that the scanning software will perform a more accurate (or more legible) representation than a grayscale image converted to bitonal?

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