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• Archive software for big files and fast index

  - by AkiRoss

  I'm currently using tar for archiving some files. Problem is: archives are pretty big, contains many data and tar is very slow when listing and extracting. I often need to extract single files or folders from the archive, but I don't currently have an external index of files. So, is there an alternative for Linux, allowing me to build uncompressed archive files, preserving the file attributes AND having fast access list table? I'm talking about archives of 10 to 100 GB, and it's pretty impractical to wait several minutes to access a single file. Anyway, any trick to solve this problem is welcome (but single archives are non-optional, so no rsync or similar). Thanks in advance! EDIT: I'm not compressing archives, and using tar I think they are too slow. To be precise about "slow", I'd like that: listing archive content should take time linear in files count inside the archive, but with very little constant (e.g. if a list of all the files is included at the head of the archive, it could be very fast). extraction of a target file/directory should (filesystem premitting) take time linear with the target size (e.g. if I'm extracting a 2MB PDF file in a 40GB directory, I'd really like it to take less than few minutes... If not seconds). Of course, this is just my idea and not a requirement. I guess such performances could be achievable if the archive contained an index of all the files with respective offset and such index is well organized (e.g. tree structure).

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• Interpreting and using the Asterisk "timing test" command

  - by zigg

  Timing is very important for certain kinds of applications in Asterisk. If DAHDI is the timing source, the dahdi_test command can be used to check the timing provided by the DAHDI kernel module. If dahdi_test returns exclusively measurements above 99.975%, the DAHDI timing source is generally considered good. Since Asterisk 1.6, new timing sources have become available, such as pthread and timerfd. The accuracy of these timing sources seems to be measurable with the Asterisk CLI timing test command: localhost*CLI> timing test Attempting to test a timer with 50 ticks per second. Using the 'timerfd' timing module for this test. It has been 1000 milliseconds, and we got 50 timer ticks My concern is that timing 50 ticks seems to be a considerably less stressful test than dahdi_test's 8192 samples in 8000 ms, particularly since just about every system I've tried it on, virtual or otherwise, can handle it. I can ask timing test to ramp it up to what I think are dahdi_test's standards: localhost*CLI> timing test 1024 Attempting to test a timer with 1024 ticks per second. Using the 'timerfd' timing module for this test. It has been 1000 milliseconds, and we got 1024 timer ticks This will indeed break down a bit depending on the system I'm using, usually with a decrease in timer ticks. But I'm not sure whether this is useful to stress it to this level. Is there authoritative guidance on using and interpreting the timing test command to insure that a given Asterisk system has a timing source that will work well?

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• How to set up QoS on ADSL router (terracom) for prioritizing browsing

  - by DBZ_A

  I want to configure the ADSL router which connects 10+ machines to the internet. I want to give maximum priority to browsing (ports 80,443) and set low priority for bittorrent etc.(port 42180) I have been experimenting with settings , but with no luck. There are three settings which confuse me, along with my understanding. 802.1 Priority - Related to LAN level, possible values 0-7 , higher numbers means higher priority. 'Mark traffic priority' - clueless about this. IPP/DS - IP Precedence - possible values 0-7 ; 6 & 7 are reserved, so set 5 for highest priority. Or when using DSCP - set 46 for highest priority. Please help me in getting this done... Similer question for another model of router here , but with less number of confusing options :) How to configure QoS on home router Update: from discussion on another thread, QoS can control only upstream traffic (from router to the internet) , while this may in turn affect downstream traffic rate, there is no direct control over data coming into the router.

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• Should windows services be created with custom users, or should I use one of LocalSystem/LocalServic

  - by Justin Dearing

  I'm asking the question in general for the average custom developed NT service or unix OSS daemon ported to windows with SCM support. However, at the moment my immediate concern is for mongodb. From my experience with UNIX I like all my services to run as different unprivileged users. The way this has translated to windows is as follows: Create a local (or domain if it has to talk to SQL server) windows user with a long random password (lately an ASCII85 encoded guid generated from a different machine). Set it to next expire and forbid it from changing its password. Remove that user from the "Users Group". Grant that user "Login as a Service" permission. Give it read permission to the folder where the app resides, and write permission to the logs and data files the applications use. Assign the user to the service. Troubleshoot until the service starts. My feeling is that the unprivileged users are less powerful than the 3 special service users. I also feel that by isolating which users run which services, I would limit collateral damage if a way to compromise one service was found.

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• LASER x Deskjet Printer

  - by Mike

  I am about to buy a color printer. I had a b&W laserjet printer in the past but since then I use deskjet for decades. I need a printer that can deliver high quality as these photo deskjet printers but I am tired of paying ink that costs $9,000 per gallon of ink (1 gallon = 3.785 liters = 300 cartridges = $9,000). So, I was pondering about buying a color laser, but I am not sure if these printers can deliver the same quality and worth the investment in terms of toner consumption. I remembered that my old laserjet printer was able to print 1100 pages per toner cartridge. The deskjet printers I have can print 500 pages per cartridge. Price by price, 2 deskjet cartridges have more or less the same cost as one toner cartridge and in theory prints almost the same. I am not sure if this is true for color lasers. What you guys can tell me about quality, toner cost and cost per page using laser or deskjet. Does it worths the change? Remember that a deskjet printer costs $50 and a laser printer costs $200. thanks.

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• 403 Forbidden when Deploying asp.net 4.0 site to IIS 7

  - by Jordan

  So I have an EC2 instance running, the URL NoWeatherSurprises.com I have the DNS pointing there, and I set up a new site in IIS 7 and pointed it to a folder. I used Visual Studios Web Developer 2010 express to publish to this folder. It now has the binaries and such. However if I go to NoWeatherSurprises.com I get the welcome to IIS 7 screen. I'd expect to go to my application If I navigate to http://noweathersurprises.com/weather/ [weather was the folder I published to under wwwroot] I get a 403 forbidden. I have no idea why, I am guessing that it is trying to do a directory listing or something instead of launching my MVC Application. So 2 problems in summary. It is not pointing the domain to the folder directly and I need to add /weather I am getting a 403 forbidden instead of the results of my home controller with the index action. I am new to IIS 7, I had been using IIS 6 and had a lot less trouble setting it up, but I suspect that's my own fault and i am just missing something. Thanks in advance for any help

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• Passwordless SSH not working - keys copied and permissions set

  - by Comcar

  I know this question has been asked, but I'm certain I've done what all the other answers suggest. Machine A: used keygen -t rsa to create id_rsa.pub in ~/.ssh/ copied Machine A's id_rsa.pub to Machine B user's home directory Made the file permissions of id_rsa.pub 600 Machine B added Machine A's pub key to authorised_keys and authorised_keys2: cat ~/id_rsa.pub ~/.ssh/authorised_keys2 made the file permissions of id_rsa.pub 600 I've also ensured both the .ssh directories have the permission 700 on both machine A and B. If I try to login to machine B from machine A, I get asked for the password, not the ssh pass phrase. I've got the root users on both machines to talk to each other using password-less ssh, but I can't get a normal user to do it. Do the user names have to be the same on both sides? Or is there some setting else where I've missed. Machine A is a Ubuntu 10.04 virtual machine running inside VirtualBox on a Windows 7 PC, Machine B is a dedicated Ubuntu 9.10 server UPDATE : I've run ssh with the option -vvv, which provides many many lines of output, but this is the last few commands: debug3: check_host_in_hostfile: filename /home/pete/.ssh/known_hosts debug3: check_host_in_hostfile: match line 1 debug1: Host '192.168.1.19' is known and matches the RSA host key. debug1: Found key in /home/pete/.ssh/known_hosts:1 debug2: bits set: 504/1024 debug1: ssh_rsa_verify: signature correct debug2: kex_derive_keys debug2: set_newkeys: mode 1 debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug3: Wrote 16 bytes for a total of 1015 debug2: set_newkeys: mode 0 debug1: SSH2_MSG_NEWKEYS received debug1: SSH2_MSG_SERVICE_REQUEST sent debug3: Wrote 48 bytes for a total of 1063 debug2: service_accept: ssh-userauth debug1: SSH2_MSG_SERVICE_ACCEPT received debug2: key: /home/pete/.ssh/identity ((nil)) debug2: key: /home/pete/.ssh/id_rsa (0x7ffe1baab9d0) debug2: key: /home/pete/.ssh/id_dsa ((nil)) debug3: Wrote 64 bytes for a total of 1127 debug1: Authentications that can continue: publickey,password debug3: start over, passed a different list publickey,password debug3: preferred gssapi-keyex,gssapi-with-mic,gssapi,publickey,keyboard-interactive,password debug3: authmethod_lookup publickey debug3: remaining preferred: keyboard-interactive,password debug3: authmethod_is_enabled publickey debug1: Next authentication method: publickey debug1: Trying private key: /home/pete/.ssh/identity debug3: no such identity: /home/pete/.ssh/identity debug1: Offering public key: /home/pete/.ssh/id_rsa debug3: send_pubkey_test debug2: we sent a publickey packet, wait for reply debug3: Wrote 368 bytes for a total of 1495 debug1: Authentications that can continue: publickey,password debug1: Trying private key: /home/pete/.ssh/id_dsa debug3: no such identity: /home/pete/.ssh/id_dsa debug2: we did not send a packet, disable method debug3: authmethod_lookup password debug3: remaining preferred: ,password debug3: authmethod_is_enabled password debug1: Next authentication method: password

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• cPanel web server redundancy advice?

  - by crgnz

  At present I operate a (reasonably low volume) web-hosting service with a Centos 5.3 server running cPanel/WHM. I would like to implement a level of redundancy such that in the event of server failure, I can restore service with a minimum of effort in less than 60 minutes. I also want to setup a secondary DNS that cPanel will replicate with. My current idea is to kill two birds with one stone by: My current server is called "www1" Purchase an identical server (HP DL360 G4) with mirrored disks. Call this server "www2" Install Centos 5.4 (or perhaps I should install 5.3 to be identical with www1) Install cPanel/WHM on this server and fully license it Setup www1 and www2 cPanel to replicate DNS with each other Setup a nightly replication script that does the following: a) rsync's the /home directory from www1 to www2 b) dumps all MySQL databases on www1 and copies them to a temp folder (with root access only) on www2 c) triggers a script to run on www2 that restores the MySQL dumps Thus each night a fully working copy of all the websites and MySQL databases is copied to www2. I do not have enough knowledge of MySQL replication to understand if it works safely and transparently with cPanel. Thus I propose the mysql dump/copy/restore due to not knowing any better! In the event that www1 dies a horrible death, I envisage that I could login to www2, change the IP addresses to those that www1 had, and presto, the websites are available again. The advantage of this idea is that it is fairly simple and "low tech" and thus does not require an expert sysadmin to setup and monitor (I am NOT an expert sysadmin) The disadvantage of this idea is that up to a full days worth of data changes would be lost. I think this would be acceptable to the sorts of customers I host at the moment. The other disadvantage would be having to pay for a full cPanel license, but I am comfortable with that cost, so for now all I want to discuss are technical considerations. Is this a sound scheme?

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• osx bash grep - finding search terms in a large file with one single line

  - by unsynchronized

  Is there simple unix command line i can enter which lets me isolate say 512 bytes either side of a search term, even if there is only one "line" in a very large text file? Ok, this should be easy. Famous last words. I'm not that familiar with grep, but it seems it is mainly used to filter out lines in the input that contain search terms. I have a very large json file that I downloaded that i want to search for a particular term. before you click the link - it's over 244MB so be warned - it is from the internet wayback machine and contains lists of zip files of archived photos. i am trying to find mine. Their web interface is broken, so i found the json file that they make public here - it's the last one on the list. when i grep looking for my username, it finds it, but proceeds to dump that line to the console. the problem is that line is 244MB long, and it's the only line in the file. i tried using less, but could not get that to do much - it's very slow, and seems to have the same issue. is there simple unix command line i can enter which lets me isolate say 512 bytes either side of a search term?

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• Stop Picasa (Mac) from scanning my harddrive

  - by Bodyscanner

  I want to use Picasa desktop app instead of the tedious & clunky web interface to share a couple of photos. Every time I launch Picasa it proceeds to open an annoying pop-up/tool-tip which flicks through every file on my HD using <=95% of CPU. I don't want this so I click the X. It appears again. I try to drag it somewhere less annoying onscreen but it pings back. I look in prefs for an option to turn it off. I give up and quit app until a new build comes out, which I download and repeat the above. WTF?! I understand Google can't be as cool as Apple - iPhoto isn't perfect by any means but at least it looks nice and 'just works'. I want to launch Picasa, not have it go through everything, not have 1000's of random pics and HD cruft on display in the list, and then perhaps drag in a few photos and upload them. Any idea of if that is possible? </rant>

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• Http-Only cookies in WebLogic: what versions support them/how and why are they supported?

  - by John

  We want to make all cookies set by our webapp http-only. I only have a basic understanding of the benefits of doing this but I'm told by security people that it's a Good Thing (tm) Our app is running under JDK1.6.05 and WebLogic10.3.0 After way too much digging around Oracle's website for documentation, I've found good evidence that the first version of WebLogic to support http-only cookies is 10.3.1. By "support," I mean the cookie-http-only deployment-descriptor element. Before we go about upgrading, I'd be nice to have these questions answered: 1a) Is it accurate that WL10.3.1 is the first version to support http-only cookies and that we're out of luck with 10.3.0? 1b) If we do indeed need to upgrade, is there an easy to do so under Windows? I've heard people mention an "upgrade jar" that you just stick in the classpath but I can't find any mention of this by Oracle. Does an easy way exist, or do we need to do a full-install of the new version? 2) What does the cookie-http-only deployment-descriptor element do when enabled? Will it ensure all cookies set by the application have an http-only=true attribute? Will it do more or less? Is there anything I'll have to do programmatically? 3) Is there anything in general I should know about http-only cookies, getting my web app to take advantage of them, or other security concerns?

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• Block protect (Keep last line of paragraph with next paragraph)

  - by Ed Cottrell

  Is there a way to force Microsoft Word 2010 to keep the last line of a paragraph with the next paragraph? An example of when this is relevant is when starting a block quote; it doesn't look good to have the block quote start at the top of a new page, particularly when it's introduced by a partial sentence, like this: "Lorem ipsum" is sample text widely used in the publishing industry, as the text has spacing roughly similar to that of English and therefore looks "normal" but unintelligible to an English reader's eye, allowing the reader to focus on design elements. It begins, Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam rhoncus laoreet risus, quis congue leo viverra congue. Suspendisse magna massa, viverra imperdiet est eu, ultrices volutpat lectus. Sed pulvinar est id risus lobortis venenatis. There shouldn't be a page break after "begins," because it looks like the sentence ends abruptly. "Keep lines together" won't work, because by definition we're talking about two paragraphs. "Keep with next" won't work if the first paragraph is larger than a couple of lines, because then you get an awkwardly large space at the bottom of a page. Manual line breaks obviously work, but only when the document is final, which is often less certain than it seems. I know WordPerfect has a feature called "block protect" that does this, but I have not found even an acceptable substitute in Word. I have played with style separators and hidden paragraph breaks, but to no avail. I would love a special character, kind of like the nonbreaking space or zero width optional space, that tells Word to move to the next page if the next paragraph would otherwise start the page. A macro would also be great, but I haven't been able to find a starting point (like how to detect where non-manual page breaks fall). Edit: It looks like "Keep with next" works this way in Word 2013, but I specifically need a fix that works in Word 2010.

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• Least CPU intensive way of streaming your screen on windows?

  - by sinni800

  Hello, sometimes I like capturing my screen for others to see. Only thing: I am playing games while I do it. I have tried a few streaming solutions where Windows Media Encoder coupled with my own Windows server appealed to me most, because I can change resolutions, etc. I also tried ustream coupled with the Flash applet and the Adobe Flash Encoder recording a Camtasia source. Camtasia has the disadvantage though that it shows the green-and-black-alternating borders and can not be targeted fullscreen. I like how xfire does it. But it doesn't work with every game, many are simply not supported. A few thoughts about this: Is there a program which captures like Fraps or XFire (based on Direct3D and OpenGL outputs) and exposes the output to a DirectShow source filter? Which brings me to: Is there hardware accelerated capturing directly from the graphics card? Maybe including direct encoding with help from OpenCL? Modern graphic cards decode BluRay content directly for example. I should have a modern enough graphics processor for this to be possible (see below). If using Windows Media Encoder: Which are the least CPU intensive settings? Which codec? Is there a newer codec than Windows Media 9? Is it less CPU intensive? I only have 7, 8 and 9 inside the Encoder Could the performance be massively increased by having a Quad-Core CPU (see below)? Bandwidth is no problem up to 1000 to 1500 kbit/s (I have 2048). My Computer specs: Intel Core 2 Duo E8400 4 GB DDR2-800 Ram Ati Radeon HD5770 Using Windows 7 Professional

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• Slow parity initialization of RAID-5 array on HP Smart Array 411 controller

  - by Rob Nicholson

  On 29th October 2011, I built a RAID-5 array using 4 x 146.8GB Seagate SAS ST3146855SS drives running at 15k connected to a PowerEdge R515 with HP Smart Array P411 controller running Windows 2008 (so nothing particularly unusual). I know that parity initialisation of a RAID-5 array can take some time but it's still running after 2.5 weeks which seems a little unusual. I'd previously built another array on the same controller using 4 x 2TB SATA-2 drives and that did take a while to complete but a) I'm sure it was less than 2.5 weeks, b) that array was ~12 times bigger and c) during initialization, the percentrage slowly increased each day. At the moment, the status display for this new 2nd array simply says "Parity Initialization Status: In Progress" and it's said that since the start. It's this lack of change on the status that worries me the most - feels like it's not actually doing anything. Do you think something has gone wrong or am I being unpatient and for some reason, the status not increasing is normal? I kind of expected a much smaller array on faster drives (15k SAS versus 7.5k SATA-2) to build in a few days. This is our primary SAN running StarWind so my "have a play" options are very limited. This 2nd array is currently in use for one small virtual disk so I could shut the target machine down, move the virtual disk to another drive and try rebuilding.

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• Networking Problem MrxSmb event 50 "Delayed Write Failed" errors occurring all of the sudden

  - by Johnny Musso

  JUST THIS MONTH, we have started getting reports from a number of very stable clients that MrxSmb event id 50 errors keep appearing in their system event logs. Otherwise, they do not appear to have any networking problems except that there is a critical legacy application which seems to either be generating the MrxSmb errors or having errors occur because of them. The legacy application is comprised of 16 bit and 32 bit code and has not been changed or recompiled in many years. It has always been stable on Windows XP systems. The customers that have the problem usually have a small (5 clients or less) peer to peer network with all Windows XP systems. All service packs are loaded on the XP machines. Note: The only thing that seems to correct the problem is disabling opportunistic locking. I don't like this solution because it seems to slow down the network and sometimes causes record locking issues between users (on some networks). Also, this seems to have just started happening - as if a Windows update for XP has caused it? However, I have removed recent updates and it did not correct the issue. Thanks in advance for any help you can provide.

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• Does fast typing influence fast programming?

  - by Lukasz Lew

  Many young programmers think that their bottleneck is typing speed. After some experience one realizes that it is not the case, you have to think much more than type. At some point my room-mate forced me to turn of the light (he sleeps during the night). I had to learn to touch type and I experienced an actual improvement in programming skill. The most surprising was that the improvement not due to sheer typing speed, but to a change in mindset. I'm less afraid now to try new things and refactor them later if they work well. It's like having a new tool in the bag. Have anyone of you had similar experience? Now I trained a touch typing a little with KTouch. I find auto-generate lessons the best. I can use this program to create new lessons out of text files but it's only verbatim training, not auto-generated based on a language model. Do you know any touch typing program that allows creation of custom, but randomized lessons?

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• What is the difference between Startup programs in windows and the same programs being started manually

  - by sup

  I am no Windows guy, but I am trying to get a seamless integration of Windows program through Virtual Box Windows guest onto my Ubuntu machine. I more or less followed this tutorial: https://nowhere.dk/articles/running-windows-applications-natively-with-seamlessrdp Basically I start up Windows in Virtual Box and then I try to launch an application (on Ubuntu host) like this: rdesktop -A -s "c:\Program Files\ThinLinc\WTSTools\seamlessrdpshell.exe notepad.exe" 192.168.123.103:3389 -u user -p password That just gives me full Windows desktop that I do not want. However, when I run (on the Windows guest) "c:\Program Files\ThinLinc\WTSTools\seamlessrdpshell.exe" "notepad" The command above works and I get just the window I want. Now, so I thought I would put this command into startup folder of the Windows machine and everything would be fine. But it says "Unable to set up the virtual channel". (by googling, I nailed it to this file: https://sourceforge.net/p/rdesktop/code/1686/tree/seamlessrdp/trunk/ServerExe/vchannel.c - the warning is triggered (by main.c in the same directory) when function vchannel_open() returns something that C interprets as yes for if condition). I have no idea why it works when I launch this command manually via a bat file and not when I put it to startup programs. Any ideas?

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• Where can I find a useful multi-language Unicode font for Mac OS X?

  - by Stephen Jennings

  On every browser I've tried (Firefox, Safari, Chrome, and Omniweb), when I go to a web page containing somewhat less-common characters, I can't see the glyphs. For example, on the Wikipedia page for the Bengali Language, the very first line contains a string of squares; on Windows, I can see the Bengali writing. Firefox does display code points on the Coptic Language article, but not Bengali. I'm not sure why. On Windows, as long as I have the Arial Unicode MS font installed, these characters fall back to that font and display properly. Mac OS X doesn't seem to ship with a font containing these Unicode characters (it has Arial Unicode MS, but it must be a subset of the Windows version because Bengali doesn't display in that font). I checked on my Snow Leopard DVD and I installed "Additional Fonts" from the Optional Installs package, but I'm still missing many languages. Is there any good, free font that contains a large collection of languages? I know creating fonts is difficult and time-consuming, but it seems like including at least one font like this with operating systems should be standard by now.

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• MySQL /G output

  - by conandor

  I ran mysql query as below on a non-partition table mysql> use test31 Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed mysql> explain partitions SELECT * FROM my_friends WHERE (requestor = '1234567890' OR contact = '1234567890') AND status = 1 ORDER BY request_id DESC LIMIT 0,100\G *************************** 1. row *************************** id: 1 select_type: SIMPLE table: my_friends partitions: NULL type: index_merge possible_keys: friend_index,requestor,contact key: friend_index,contact key_len: 17,17 ref: NULL rows: 2 Extra: Using sort_union(friend_index,contact); Using where; Using filesort 1 row in set (0.00 sec) on a partition table mysql> explain partitions SELECT * FROM my_friends WHERE (requestor = '1234567890' OR contact = '1234567890') AND status = 1 ORDER BY request_id DESC LIMIT 0,100\G *************************** 1. row *************************** id: 1 select_type: SIMPLE table: my_friends partitions: p1_p1sp0,p1_p1sp1,p1_p1sp2,p1_p1sp3,p1_p1sp4,p1_p1sp5,p1_p1sp6,p1_p1sp7,p1_p1sp8,p1_p1sp9,p1_p1sp10,p1_p1sp11,p1_p1sp12,p1_p1sp13,p1_p1sp14,p1_p1sp15,p1_p1sp16,p1_p1sp17,p1_p1sp18,p1_p1sp19,p1_p1sp20,p1_p1sp21,p1_p1sp22,p1_p1sp23,p1_p1sp24,p1_p1sp25,p1_p1sp26,p1_p1sp27,p1_p1sp28,p1_p1sp29 type: index_merge possible_keys: friend_index,requestor,contact key: friend_index,contact key_len: 17,17 ref: NULL rows: 60 Extra: Using sort_union(friend_index,contact); Using where; Using filesort 1 row in set (0.01 sec) What does the "rows" mean? less rows is more faster query?

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• Linking to a chat room via XMPP: URI

  - by Coderer

  I found out how to link directly to a chat room on a Jabber conference server -- it took a bit of digging, and I wound up actually looking at the spec before I was sure I was doing it right. I confirmed here, so I'm pretty sure I've got it. The results, though, are puzzling. If I click a link of the style xmpp:[email protected] I get a new chat session with user "dude" at example.com, as expected. If I tack on a nonsense query (xmpp:[email protected]?foobar), it's ignored, which is what the spec says should happen. However, if I use xmpp:[email protected]?join, as in the link above, nothing happens. I dug a little deeper, and found out that on my (Linux) system, xmpp URIs are handled via purple-url-handler, so I dropped to a terminal and ran it manually. The result was that any xmpp URI ran fine except one that includes a ?join query. The ?join query results in a dbus crash, pointing specifically to line 2356 of dbus-message.c -- a little Googling suggests this probably is dbus's less-than-elegant way of telling me that somebody is using dbus incorrectly. Am I crafting my link correctly? Is this an OS or maybe application issue? Does this work on other platforms / browsers / etc? More importantly, is there any easy way to fix it?

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• Cooling for a small server room

  - by John Zwinck

  I have a server room about 12 feet square with an unfinished ceiling (exposed ducts and wiring). It houses a few servers (about ten, 1U and 2U) and some networking gear (four 1U switches, three routers, three modems, two cable boxes). With the door closed, it runs around 80 degrees Fahrenheit with half the servers turned on. When I turned on all the servers it reached 86 before I chickened out and propped the door open. The room is adjacent to air-conditioned office space, but does not itself have dedicated air conditioning. The ventilation for this room seems to be limited to one duct coming in at ceiling level, with a powered fan to draw air in, and one duct at ceiling level to allow air to flow out (it seems like it may just go into the drop ceiling cavity in the adjacent room). The adjacent office space stays fairly cool, but I'd prefer not to leave the door propped open all the time. There is both 110v and 208v service in the room, and plenty of power available. But there are no windows, and no floor drains (in a pinch we might be able to run a condensation hose through a small hole we'd drill in the wall to a nearby sink area, but only if absolutely necessary). I've considered portable A/C units, but I'm not sure on sizing and a lot less sure how we would run the exhaust hose(s). I suppose we could point one at the existing room exhaust duct (air return), but substantially modifying the duct is probably a no-no. I've also considered installing a fan box in the door of the room, but I'm concerned that this will only drop the temperature a little. Even right now, with all the equipment on, the room is at 83 degrees with the door open. And the main building A/C turns off daily at 6 PM to conserve energy, so the adjacent room temperature rises at night. How would you cool this room? Let's say the goal is to bring the temperature with everything running from a steady state of around 90 degrees down to 75 (equivalently, to offset the heat produced by ten 1U servers).

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• Connection reset by peer: mod_fcgid: error reading data from FastCGI server Issues

  - by user145857

  Help is greatly needed for our server. We are experiencing random "Connection reset by peer: mod_fcgid: error reading data from FastCGI server" errors which cause a 500 internal server error. If the page is then reloaded it loads normally as it should. We are running MPM Worker with mod FCGID to handle PHP. We had APC cache enabled but disabled it recently to see if it would fix the problem, but the random mod FCGID errors are still continuing. No other opcode cache is active now. Our settings are below: <IfModule worker.c> MinSpareThreads 25 MaxSpareThreads 150 ThreadsPerChild 25 ThreadLimit 100 ServerLimit 700 MaxClients 700 MaxRequestsPerChild 0 </IfModule> <IfModule mod_fcgid.c> FcgidMaxRequestLen 1073741824 FcgidMaxRequestsPerProcess 2000 FcgidMaxProcessesPerClass 100 FcgidMinProcessesPerClass 0 FcgidConnectTimeout 300 FcgidIOTimeout 900 FcgidFixPathinfo 1 FcgidIdleTimeout 300 FcgidIdleScanInterval 120 FcgidBusyTimeout 300 FcgidBusyScanInterval 120 FcgidErrorScanInterval 12 FcgidZombieScanInterval 12 FcgidProcessLifeTime 3600 </IfModule> The server is a 64 core 2.1 GHZ 94 GB RAM so it has some power. Some of the fcgid timeout settings are higher because we run large reports which take up to 15 minutes. Any help is greatly appreciated! Just to clarify, the random fcgid errors are occurring when a user clicks a page on our site and the 500 error page loads instantly. This is random and occurrs less than 1% of the time but it is still an issue.

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• Ways to go about optimizing website performance WordPress, Amazon EC2 Apache and RDS MySQL

  - by fuzzybee

  I have 6 WordPress websites running on 1 single EC2 instance. All the the websites are connecting to databases in 1 same RDS instance. Earlier today, traffic to the largest website peaked and the RDS instance went bottle-neck - CPU utilization was 100% for over an hour. It affected all of my websites as it took them all forever to load. In order to prevent such issue from happening again, which of the following will matter most so that I invest time and effort in first of all? (I will work on all later, I just need to prioritise now) To improve caching for all websites To fine-tune the database server To fine-tune my Apache server What will be the effect on user experience for my websites? Some quick searches show that I should limit number of concurrent connections to my web server but wouldn't that prevent users from accessing my websites? More background: My largest website has 140k visits and 660k page views a month. The other 5 websites should add up much less than that. I'm using a large EC2 instance as the web server I'm using a medium RDS instance as the database server What I've already done: Use W3 Total Cache plugin for caching for most the websites, especially the largest one (I can barely anything else in terms of caching I could do for the largest website) Am I using my resources wastefully or is there simply not enough resources for my websites - or rather, how do I answer that question myself?

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• how to correctly mount fat32 partition in Ubuntu in order to preserve case

  - by Dean

  I've found there are couple of problems might be related how my FAT32 partition was mounted. I hope you can help me to solve the problem. I also included the command I used to help others when they find this post, sorry to those might feel I should use less space. I've the following file structures on my disk dean@notebook:~$ sudo fdisk -l Disk /dev/sda: 160.0 GB, 160041885696 bytes 255 heads, 63 sectors/track, 19457 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x08860886 Device Boot Start End Blocks Id System /dev/sda1 * 1 13 102400 7 HPFS/NTFS Partition 1 does not end on cylinder boundary. /dev/sda2 13 5737 45978624 7 HPFS/NTFS /dev/sda3 5738 10600 39062047+ 83 Linux /dev/sda4 10601 19457 71143852+ 5 Extended /dev/sda5 10601 11208 4883728+ 82 Linux swap / Solaris /dev/sda6 11209 15033 30720000 b W95 FAT32 /dev/sda7 15033 19457 35537920 7 HPFS/NTFS In the etc/fstab I've got UUID=91c57a65-dc53-476b-b219-28dac3682d31 / ext4 defaults 0 1 UUID=BEA2A8AFA2A86D99 /media/NTFS ntfs-3g quiet,defaults,locale=en_US.utf8,umask=0 0 0 UUID=0C0C-9BB3 /media/FAT32 vfat user,auto,utf8,fmask=0111,dmask=0000,uid=1000 0 0 /dev/sda5 swap swap sw 0 0 /dev/sda1 /media/sda1 ntfs nls=iso8859-1,ro,noauto,umask=000 0 0 /dev/sda2 /media/sda2 ntfs nls=iso8859-1,ro,noauto,umask=000 0 0 I checked my id using id and I've got dean@notebook:~$ id uid=1000(dean) gid=1000(dean) groups=4(adm),20(dialout),24(cdrom),46(plugdev),103(fuse),104(lpadmin),115(admin),120(sambashare),1000(dean) I don't know why with these settings I still have problem of using svn like in this one Thank you for your help!

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• Current wisdom on SQL Server and Hyperthreading?

  - by BradC

  Lots of articles out there (see Slava Oks's original SQL 2000 article and Kevin Kline's SQL 2005 update) recommend disabling hyperthreading on SQL servers, or at least testing your specific workload before enabling it on your servers. This issue is gradually becoming less relevant as true multi-core processors replace hyperthreaded ones, but what's the current wisdom on this issue? Does this advice change any with SQL 2005 64-bit, or SQL 2008, or Windows Server 2008? Ideally, this should be tested in advance in a staging environment, but what about for servers that have already made it into production with HT enabled? How can I tell if performance issues we're experiencing might be related to HT? Is there some specific combination of perfmon counters that might point me in that direction, as opposed to all the other things I normally pursue when working on improving SQL performance? Edit: This is especially attractive because of the potential for an across the board improvement for some of my high-cpu servers, but the client is going to want to see something concrete that helps me identify which servers really could benefit from disabling hyperthreading. Of course, conventional performance troubleshooting is ongoing, but sometimes any little bit helps.

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