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• Why does Windows make random "device connect" and "device disconnect" sounds?

  - by Steve Elmer

  Hello, I've been noticing this since Windows Vista. I see it on Windows 7, now, as well. In any case throughout the day I notice that my computer makes apparently random device-connect and/or device-disconnect ("boink") sounds. I suppose it is the same sound you hear when connecting or disconnecting a USB device such as a thumb drive. I've noticed that this happens on each of three computers I work with at home, my wife's computer, and my machine at work. It happens without any user action at all - i.e. I'll be just sitting there (hands off my mouse and keyboard), and the computer will make the sound. There is no visual queue or anything. Just the sound. I have sometimes gone in pursuit of the sound - running virus scans, examining event logs and such, and observing task manager - but have never had any luck tracking this thing down, but have not had any luck. Surely someone else out there must be experiencing this, too. Any ideas? Thanks, Steve

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• ZFS with L2ARC (SSD) slower for random seeks than without L2ARC

  - by Florian Kruse

  I am currently testing ZFS (Opensolaris 2009.06) in an older fileserver to evaluate its use for our needs. Our current setup is as follows: Dual core (2,4 GHz) with 4 GB RAM 3x SATA controller with 11 HDDs (250 GB) and one SSD (OCZ Vertex 2 100 GB) We want to evaluate the use of a L2ARC, so the current ZPOOL is: $ zpool status pool: tank state: ONLINE scrub: none requested config: NAME STATE READ WRITE CKSUM afstank ONLINE 0 0 0 raidz1 ONLINE 0 0 0 c11t0d0 ONLINE 0 0 0 c11t1d0 ONLINE 0 0 0 c11t2d0 ONLINE 0 0 0 c11t3d0 ONLINE 0 0 0 raidz1 ONLINE 0 0 0 c13t0d0 ONLINE 0 0 0 c13t1d0 ONLINE 0 0 0 c13t2d0 ONLINE 0 0 0 c13t3d0 ONLINE 0 0 0 cache c14t3d0 ONLINE 0 0 0 where c14t3d0 is the SSD (of course). We run IO tests with bonnie++ 1.03d, size is set to 200 GB (-s 200g) so that the test sample will never be completely in ARC/L2ARC. The results without SSD are (average values over several runs which show no differences) write_chr write_blk rewrite read_chr read_blk random seeks 101.998 kB/s 214.258 kB/s 96.673 kB/s 77.702 kB/s 254.695 kB/s 900 /s With SSD it becomes interesting. My assumption was that the results should be in worst case at least the same. While write/read/rewrite rates are not different, the random seek rate differs significantly between individual bonnie++ runs (between 188 /s and 1333 /s so far), average is 548 +- 200 /s, so below the value w/o SSD. So, my questions are mainly: Why do the random seek rates differ so much? If the seeks are really random, they should not differ much (my assumption). So, even if the SSD is impairing the performance it should be the same in each bonnie++ run. Why is the random seek performance worse in most of the bonnie++ runs? I would assume that some part of the bonnie++ data is in the L2ARC and random seeks on this data performs better while random seeks on other data just performs similarly like before.

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• Apache can't be restarted after changes to the configuration file

  - by Sharifhs

  Hello, I can't successfully configure the apache and php configuration files, can anybody help me in this way? Apache 2.2.16 (win32-x86-no_ssl.msi) was installed into “C:\Apache2.2 “location. Then PHP 5.3.3 (VC9 x86 Thread Safe) zip file was downloaded and extracted on “C:\php” location. From “C:\php” I renamed the “php.ini-development” file into “php.ini” “php.ini” file was opened with notepad, and modified as: doc_root = "C:\Apache2.2\htdocs" extension_dir = "C:\php\ext" The following lines were added to the Apache's configuration file “httpd.conf”: LoadModule php5_module "C:/php/php5apache2_2.dll" AddType application/x-httpd-php .php PHPIniDir "C:/php" N.B.: Thanks all for comments and answer, but I can't reply none your comments, I don't know why. May be I'm not privileged to put any comment as I'm new here (is it the case?)! That's why I'm to edit my post to reply you all. Tell me what can I do? @ jer.salamon: do you want me to post full httpd.conf file? It'll be longer then! @ davr: the server started first, but when I configured those files, its never started again @jer.salamon: did you mean keeping this way: doc_root = extension_dir = "ext" It not yet restared!

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• Visual Studio 2010 Beta 2, built-in font smoothing

  - by L. Shaydariv

  I've just installed Visual Studio 2010 Beta 2 onto my Windows XP to evaluate it and check whether it meets my preferences the way it did before. Okay, I've temporary defeated an urgent bug with a strange workaround (I could not open any file from the Solution Explorer), and it left bad memories to me. But however, it's okay. The first thing I've seen just opening the code editor was ClearType font rendering. Wow, so unexpectedly. I must note that I do not use standard Windows rendering techniques, but I still prefer GDI++, a font renderer developed by Japanese developers. (GDI++ allows to render the fonts in Mac/Win-Safari style over entire Windows.) Personally for me, GDI++ reaches the great font-rendering results allowing me to use the Dejavu Sans Mono font with really nice smoothing in Visual Studio 2008 (VS 2005 too, though VS 2005 crashes in this case). But GDI++ cannot affect Visual Studio 2010 Beta 2 text editor - it uses ClearType (right?), and it does not care about the system font smoothing settings. It could be an editor based on WPF, right? So as far as I can see, I can't use GDI++ anymore because it uses Windows GDI(+) but no WPF? So I've got several questions: Is it possible to disable VS 2010 b2 built-in ClearType or override it with another font smoother? Is it possible to install a Safari-like font renderer for Visual Studio 2010 [betas]? Thanks a lot.

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• prevalent, recurring hardrive failure intel macbook from 2006/2007

  - by SimonSalman

  Hi, Long story: My MacBook's hard drive failed one year ago, just a month after its warranty ended or: a year and a month after I bought it. After about ten phone calls to Apple's service, they agreed to extend the warranty for another year, so that I got it replaced free of charge. In the mean time, I got to know that many MacBook users that experience/report hard drive failures. Every reported crash was preceded by a slowdown of system performance, an increased occurrence of the spinning beach ball wait courser, and frequent crashes of applications that used to run very robust until then. It happened (as far as I know) with MacBooks from 2006/2007. All these MacBooks additionally suffer from a recurring wearing down of their "top case". Many heavy users had to replace their HDDs three time since 2006/2007 resulting in an head crash, making it impossible to recover data (diagnosis of recovery specialists) in most but not all cases HDD was Seagate (doesn't necessarily have to be the cause, if majority of the MacBook charge contained Seagate drives) And right now (one year after my first disk crash), these symptoms are cumulating on my system, again ... Short version: prevalent hard drive failure on MacBook charge from 2006/2007 (i.e. 2.16 GHz Intel Core 2 Due) I am looking for any (preferable open source) tool for checking the hard drive condition, especially to detect the known "MacBook problem". So, that I can replace the disk on time. If any Mac user found a solution to prevent the repeated failure of heir hard drive, I would be very glad to get to known it. I really enjoy my old MacBook, but I hate to get interrupted every year by an HDD crash. BTW, the issue is already in discussion for a long time, but there seems to be no solution, so far. Thanks, Simon

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• Mac Backup Plan

  - by Chuy77

  I'm reviewing my backup plan and would appreciate any thoughts about what more I should do (if anything) to make sure I'm properly covered in case of all hell breaking loose. :-) I have one machine. 1) I run a nightly clone with SuperDuper. I alternate the clone drive weekly so I have two clones, one never more than a week old. 2) I use BackBlaze as a sort of Time Machine in the cloud. It runs all the time and keeps everything on my machine backed up online. 3) I sync all my 1Password logins, etc. to my iPhone once a week. ...And that's it. I feel pretty covered. But I'm always reading stuff like this: http://www.43folders.com/2010/03/15/yes-another-backup-lecture And that doesn't even mention online backup, and seems like a huge pain in the behind. But maybe I'm being naive? Should I have more backups? Thanks for any feedback. I really appreciate it.

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• FreeBSD rc.d script doesn't work when starting up

  - by kastermester

  I am trying to write a rc.d script to startup the fastcgi-mono-server4 on FreeBSD when the computer starts up - in order to run it with nginx. The script works when I execute it while being logged in on the server - but when booting I get the following message: eval: -applications=192.168.50.133:/:/usr/local/www/nginx: not found The script looks as follows: #!/bin/sh # PROVIDE: monofcgid # REQUIRE: LOGIN nginx # KEYWORD: shutdown . /etc/rc.subr name="monofcgid" rcvar="monofcgid_enable" stop_cmd="${name}_stop" start_cmd="${name}_start" start_precmd="${name}_prestart" start_postcmd="${name}_poststart" stop_postcmd="${name}_poststop" command=$(which fastcgi-mono-server4) apps="192.168.50.133:/:/usr/local/www/nginx" pidfile="/var/run/${name}.pid" monofcgid_prestart() { if [ -f $pidfile ]; then echo "monofcgid is already running." exit 0 fi } monofcgid_start() { echo "Starting monofcgid." ${command} -applications=${apps} -socket=tcp:127.0.0.1:9000 & } monofcgid_poststart() { MONOSERVER_PID=$(ps ax | grep mono/4.0/fastcgi-m | grep -v grep | awk '{print $1}') if [ -f $pidfile ]; then rm $pidfile fi if [ -n $MONOSERVER_PID ]; then echo $MONOSERVER_PID > $pidfile fi } monofcgid_stop() { if [ -f $pidfile ]; then echo "Stopping monofcgid." kill $(cat $pidfile) echo "Stopped monofcgid." else echo "monofcgid is not running." exit 0 fi } monofcgid_poststop() { rm $pidfile } load_rc_config $name run_rc_command "$1" In case it is not already super clear, I am fairly new to both FreeBSD and sh scripts, so I'm kind of prepared for some obvious little detail I overlooked. I would very much like to know exactly why this is failing and how to solve it, but also if anyone has a better way of accomplishing this, then I am all open to ideas.

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• What's the best way to completely remove everything from a computer, without re-installing?

  - by Connor W

  I have a friend who wants to sell their computer, but obviously all personal information and software that it is on it needs to be removed before doing so. Usually I would format and reinstall it, but I cannot easily get hold of the required XP DVDs and I'm not 100% sure the serial number is stuck on the case as usual so getting hold of it will probably require more effort than I'm prepared to spend. So, what's the best and quickest way to remove and uninstall everything from the PC without reinstalling it? Thanks. EDITS: I'm looking to remove things like Internet History and all installed programs, too. I know how to remove the history and each individual program, but that could take hours. The machine is not branded and therefore there is no website I can go to download recovery software. There is no recovery partition on the computer and I'm not aware of any recovery DVDs for it either. I can only assume it was installed from a retail copy, and therefore there is no way to recover it to factory settings. It needs to have XP installed, not any distribution of Linux. Like most average people, the person getting the computer will not understand what to do with a computer that doesn't have Windows installed, and software like Office does not work on Linux either. Buying another licence is not really an option either. She has just brought a laptop to replace the computer, so buying another licence for a computer that she's getting rid of doesn't really make sense. Thanks for all the help so far!

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• WSS Search fills 10 GB limit on SBS server 2011

  - by Kactus

  I've got a SBS Server 2011 Standard SP1 that isn't very busy. 2 Users local and 2 remote. We have sharepoint that has maybe a dozen small documents at most. I've just started getting the following two error occur Could not allocate space for object 'dbo.MSSBatchHistory'.'IX_MSSBatchHistory' in database 'WSS_Search_SERVER' because the 'PRIMARY' filegroup is full. Create disk space by deleting unneeded files, dropping objects in the filegroup, adding additional files to the filegroup, or setting autogrowth on for existing files in the filegroup. And CREATE DATABASE or ALTER DATABASE failed because the resulting cumulative database size would exceed your licensed limit of 10240 MB per database. Digging around in SQL manager I see that WSS Search DB file size is 10241MB, the log file is only 147 MB Firstly, why is WSS Search taking up so much space? How can I stop it from doing so, and what can I do now to get things running ok. I know about log file truncating and this isn't the case here since the log is tiny. Any help is appreciated. There is plenty of free space on the disk (791GB free) Thanks Kactus

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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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• Conditionally Rewrite Email Headers (From & Reply-To) Exchange 2010

  - by NorthVandea

  I have a client who maintains Company A (with email addresses %username%@companyA.com) and they own the domain companyB.com however there is no "infrastructure" (no Exchange server) set up specifically for companyB.com. My client needs to be able to have the end users within it's company (companyA.com) add a specific word or phrase to the Subject (or Body) line of the Outgoing email (they are only concerned with outgoing, incoming is a non-issue in this case) that triggers the Exchange 2010 servers to rewrite the header From and Reply-To [email protected] with [email protected] but this re-write should ONLY occur if the user places the key word/phrase in the Subject (or Body). I have attempted using Transport Rules and the New-AddressRewriteEntry cmdlet however each seems to have a limitation. From what I can tell Transport Rules cannot re-write the From/Reply-To fields and New-AddressRewriteEntry cannot be conditionally triggered based on message content. So to recap: User sends email outside the organization: From and Reply-To remain [email protected] User sends email outside the organization WITH "KeyWord" in the Subject or Body: From and Reply-To change to [email protected] automatically. Anyone know how this could be done WITHOUT coding a new Mail Agent? I don't have the programming knowledge to code a custom Agent... I can use any function of Exchange Management Shell or Console. Alternatively if anyone knows of a simple add-on program that could do this that would be good too. Any help would be greatly appreciated! Thank you!!!

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• mod_rpaf with apache error_log

  - by Camden S.

  I'm using mod-rpaf with Apache 2.4 and it's working properly (showing the real client IP's) in my Apache access_log... but not in my error_log. My error log just shows the client IP address of the proxy server (my load balancer in this case) Here's an example of what I see in my error_log where 123.123.123.123 is the IP of my load balancer/proxy. == /usr/local/apache2/logs/error_log <== [Tue Jun 05 20:24:31.027525 2012] [access_compat:error] [pid 9145:tid 140485731845888] [client 123.123.123.123:20396] AH01797: client denied by server configuration: /wwwroot/private/secret.pdf The exact same request produces the following in my access_log where 456.456.456.456 is a real client IP (not the IP of the load balancer). 456.456.456.456 - - [05/Jun/2012:20:24:31 +0000] "GET /wwwroot/private/secret.pdf HTTP/1.1" 403 228 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:12.0) Gecko/20100101 Firefox/12.0" Here's my httpd.conf entry: # RPAF LoadModule rpaf_module modules/mod_rpaf-2.0.so RPAFenable On RPAFproxy_ips 127.0.0.1 123.123.123.123 RPAFsethostname On RPAFheader X-Forwarded-For What do I need to do to get the real IP addresses showing in my Apache error_log?

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• Changing Corosync/Heartbeat pair's active node based on MySQL/Galera cluster state

  - by Hace

  Background I'm planning on building a High Availability "cluster" for our Zabbix instance by placing two physical servers in one server room and two in another server room. In each server room one of the physical servers will run Zabbix on RHEL and the other will run Zabbix's MySQL database, also on RHEL. I'd prefer synchronous replication for the MySQL nodes so I'm planning on using Galera in a master-slave configuration. The Zabbix instances on the two Zabbix servers would be controlled by Heartbeat/Corosync (although Red Hat Cluster Suite is also an option...) If the Zabbix server in Server Room A goes down, the one in Server Room B becomes active (and vice versa). Ditto for the MySQL servers/instances. If either of those cases happen, however, the connection between the Zabbix server and the MySQL server becomes significantly slower as ti has to travel over WAN. Question Is it possible to configure the Heartbeat/CoroSync pair to instruct the MySQL/Galera cluster to change the master node to switch to (if available) the one that's in the server room as the active Heartbeat/Corosync -node and (more challengingly) is it possible to do the same in the other direction, i.e have the Galera cluster change the active Heartbeat/CoroSync server to be in the same room as the active MySQL master server in case of a failover in over to avoid unnecessary WAN transfers between the application and its DB? Theories Most likely I can get CoroSync to run something that'd log in to one of the DB nodes to change the MySQL/Galera master but I don't know if it's really possible to do anything similar in the other direction in Galera. Is it possible to define a "service" in CoroSync/Heartbeat so that both the service and its MySQL service would migrate as one if possible. Using the DB server that's behind WAN should still be a better option to DB downtime. Am I just using too many tools to solve a problem that'd be far simpler with something else?

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• Cluster FIle System

  - by Ben

  We are looking for to choose a clustered file system for our in house appplication. Let me first highlight my requirement. we have a storage and 2 servers at present.We get the data files from remote servers to our server and on both servers we are running our application to access those data and make a final result as per our requirements. In future may be after 3-4 months, we can add another servers in current cluster pool to handle more data load from remote location data senders. So my requirement is that to integrate same storage partition on 2-3 servers , it might be 4-5 more servers in future, My application read data from storage partition and write back to storage partition. Is there any bottleneck / limitation from RHCS , GFS2 or anything.? We are new with RHCS + GFS and all. Can we have any other better approach or someway to deal with our requirement light way? what is the best OS version for this ? how's RHEL 6.4 64 bit ? please share some case study or some gudie reference as per past experiences with such environnmnets Regards, Ben

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• starting oracle database automatically.

  - by Searock

  I am using Fedora 8 and Oracle 10g Express Edition. Every time I start my fedora I have to click on start database. How can I add startdb.sh to startup so that it automatically executes when Fedora starts? I have tried adding the path to /etc/rc.d/rc.local but it still doesn't work. ./usr/lib/oracle/xe/app/oracle/product/10.2.0/server/config/scripts/startdb.sh I have even tried to add this script in /etc/init.d/oracle #!/bin/bash # # Run-level Startup script for the Oracle Instance and Listener # # chkconfig: 345 91 19 # description: Startup/Shutdown Oracle listener and instance ORA_HOME="/u01/app/oracle/product/9.2.0.1.0" ORA_OWNR="oracle" # if the executables do not exist -- display error if [ ! -f $ORA_HOME/bin/dbstart -o ! -d $ORA_HOME ] then echo "Oracle startup: cannot start" exit 1 fi # depending on parameter -- startup, shutdown, restart # of the instance and listener or usage display case "$1" in start) # Oracle listener and instance startup echo -n "Starting Oracle: " su - $ORA_OWNR -c "$ORA_HOME/bin/lsnrctl start" su - $ORA_OWNR -c $ORA_HOME/bin/dbstart touch /var/lock/subsys/oracle echo "OK" ;; stop) # Oracle listener and instance shutdown echo -n "Shutdown Oracle: " su - $ORA_OWNR -c "$ORA_HOME/bin/lsnrctl stop" su - $ORA_OWNR -c $ORA_HOME/bin/dbshut rm -f /var/lock/subsys/oracle echo "OK" ;; reload|restart) $0 stop $0 start ;; *) echo "Usage: $0 start|stop|restart|reload" exit 1 esac exit 0 and even this doesn't work. startdb.sh is located at /usr/lib/oracle/xe/app/oracle/product/10.2.0/server/config/scripts/startdb.sh Thanks.

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• How to avoid ugly dithering when running KDE over VNC?

  - by Chris Jester-Young

  I'm currently setting up a new Xen paravirt domain running KDE (4.2.2, from Kubuntu 9.04). As I have been unable to get the virtual framebuffer working in it, I've decided to set up VNC (from the vnc4server package), and run KDE over Xvnc. This is all fine and good, and KDE starts up okay. However, all the colours look dithered, especially on the task bar and title bar, making them impossible to see. From my web searches, it appears to be because these items are drawn using Porter-Duff. This is especially the case when using the Oxygen style, and Oxygen and Ozone window titlebars (selecting these styles generates messages about Porter-Duff being unavailable); not using those styles at least makes most of the UI widgets and window titles usable again. But this doesn't solve the problem for the task bar, nor for the desktop, where the only theme available to me is Oxygen (this is under the "Desktop Settings - Plasma Workspace" window, just for reference). So, unless I have a way to use a non-Porter-Duff theme for those, it seems that KDE would still be unusable under VNC. So if someone experienced with KDE can advise on how to work around, or even fix, these issues, I'd appreciate it very much. :-)

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• Exchange 2010 DAG + VMWare HA = no support?

  - by Dan

  We currently have an Exchange 2003 clustered environment (two machine cluster) that we're looking to upgrade to 2010. We recently purchased a VMWare virtualization environment (three Dell R710's with an EMC NS-120 serving up NFS datastores - iSCSI is available) that we wish to use for this new environment. I'm seeing that Microsoft does not support Exchange 2010 DAGs with a virtualization high availability solution (see links below). I would like to utilize the DAG to ensure the data stays available if one host goes down, and HA to ensure that if the physical host goes down, the VM will come back up on the other available host. Does anybody know why MS does not support this? VMWare HA will only restart the VM if it is hung/down - I don't see any difference between this and restarting the physical box if someone pulled the power... Will we only run into issues with support if it has something to do with HA/DAG failover or will they see we have HA and tell us to put it on a physical box even if it has nothing to do with HA? If we disable HA for these VM's will that satisfy them on a support case? Has anybody set up an Exchange 2010 DAG on VMware with HA enabled? Will they have any issues with using an NFS datastore? We have much greater flexibility on the EMC with NFS vs iSCSI, so I would prefer to continue utilizing that. Thanks for any input! http://www.vmwareinfo.com/2010/01/verifying-microsoft-exchange-2010.html Take a look at the second image under "Not Supported" http://technet.microsoft.com/en-us/library/aa996719.aspx "Microsoft doesn't support combining Exchange high availability solutions (database availability groups (DAGs)) with hypervisor-based clustering, high availability, or migration solutions. DAGs are supported in hardware virtualization environments provided that the virtualization environment doesn't employ clustered root servers."

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• Virus cleanup + dying drive = XP Automatic Updates crashing in esent.dll

  - by quack quixote

  Background I'm doing system recovery on an old WinXP SP1 system brought to me on suspicion of virus infection. After taking preliminary backups, I used MalwareBytes to detect and clean the infection. I might've even gotten it all. In the process, I've discovered (a) the system drive is showing signs of impending failure, and (b) the owner has been using the system's old crusty IE-6 instead of the up-to-date Firefox I've provided for him. So naturally, thinking I had a relatively stable system, I tried to hit the Windows Update site to install IE-8, in case further training doesn't stick. The update site told me it needed to update the installer, and I started that process. Soon after, wuauclt.exe started crashing, reporting addresses in module esent.dll. There's a Microsoft KB (910437) on a problem with that DLL, so I downloaded the hotfix and installed. The crashing did not stop. I attempted to install SP3 from the offline installer, but that didn't fix the issue either. The system is reporting a few hard drive / IDE controller errors, but they don't correlate to the crashes, so they aren't the direct cause. I've also attempted to rollback to the time between the infection removal and the first crashes, but that doesn't help. Question The hotfix I tried to install dealt with problem in transaction logs of the Extensible Storage Engine (ESE) database. I suspect this issue is similar, but that the database itself (whatever the ESE database is) is corrupted. Is there a way to clean or clear this database so that system operation returns to normal? Can someone enlighten me as to what the ESE database actually is, and where it resides? Can I just locate some files and delete them to bring this under control?

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• virtual memory commited

  - by vinu

  After a server bounce happens, and after around 40-45 days time period, we receive continuous “Committed Virtual Memory” alerts which indicates the usage of swap space in the magnitude of 4GB This also causes the application to perform very slowly and experience a number of stalled transactions. Server Setup: 4 Tomcat Servers (version 7.0.22) that are load balanced (not clustered) by 2 Apache Servers. And the Apache servers themselves supply static content and routing to these 4 tomcat servers. Java Runtime Version: java version "1.6.0_30" Java(TM) SE Runtime Environment (build 1.6.0_30-b12) Java HotSpot(TM) 64-Bit Server VM (build 20.5-b03, mixed mode Memory Startup Parameters: MEMORY_OPTIONS="-Xms1024m -Xmx1024m -Xss192k -XX:MaxGCPauseMillis=500 -XX:+HeapDumpOnOutOfMemoryError -XX:MaxPermSize=256m -XX:+CMSClassUnloadingEnabled" Monitoring – Wily monitoring is available in all the production servers that monitors key server parameters and sends out configurable alert emails based on pre defined settings. Note: Each of the servers also has two other separate tomcat domains that run different applications Investigated area: There is no Heap Memory Leak and the GC is running fine without any issues over any period of time The current busy thread count corresponds directly to the application usage – weekends and nights have lesser no. of threads compared to business hours ThreadLocal uses a WeakReference internally. If the ThreadLocal is not strongly referenced, it will be garbage-collected, even though various threads have values stored via that ThreadLocal. Additionally, ThreadLocal values are actually stored in the Thread; if a thread dies, all of the values associated with that thread through a ThreadLocal are collected. If you have a ThreadLocal as a final class member, that's a strong reference, and it cannot be collected until the class is unloaded. But this is how any class member works, and isn't considered a memory leak. The cited problem only comes into play when the value stored in a ThreadLocal strongly references that ThreadLocal—sort of a circular reference. In this case, the value (a SimpleDateFormat), has no backwards reference to the ThreadLocal. There's no memory leak in this code. Can anyone please let me know what could be the cause of this and what to be monitored?

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• Which version control should I use for my configuration files?

  - by rakete

  I want to store some of my configuration files (~/.emacs.d/, .Xdefaults, etc. linux $HOME stuff) in version control so I can easily sync them with my notebook/workplace and see my past changes and revert to them should the need arise. So far it seems to me that there are quite some people using git for this and I think that I too want to use a distributed vcs for this (if only to get more used to them) but I can't say that I am very experienced with all things dvcs. I did use darcs and git briefly and so far I can say that I really like the way git handles branches, and I think the possibility to have different branches within the same directory is especially useful for my use case. Darcs on the other hand has cherry picking of patches, which too is quite the convenient feature when managing configuration files (at least I assume it is). So, what would you recommend to use? And what would be your reasoning for your recommendation? What other vcs with nice feature that I haven't mentioned exist and would make a good vcs to store configuration files and why?

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• Looking for a recommendation on measuring a high availability app that is using a CDN.

  - by T Reddy

  I work for a Fortune 500 company that struggles with accurately measuring performance and availability for high availability applications (i.e., apps that are up 99.5% with 5 seconds page to page navigation). We factor in both scheduled and unscheduled downtime to determine this availability number. However, we recently added a CDN into the mix, which kind of complicates our metrics a bit. The CDN now handles about 75% of our traffic, while sending the remainder to our own servers. We attempt to measure what we call a "true user experience" (i.e., our testing scripts emulate a typical user clicking through the application.) These monitoring scripts sit outside of our network, which means we're hitting the CDN about 75% of the time. Management has decided that we take the worst case scenario to measure availability. So if our origin servers are having problems, but yet the CDN is serving content just fine, we still take a hit on availability. The same is true the other way around. My thought is that as long as the "user experience" is successful, we should not unnecessarily punish ourselves. After all, a CDN is there to improve performance and availability! I'm just wondering if anyone has any knowledge of how other Fortune 500 companies calculate their availability numbers? I look at apple.com, for instance, of a storefront that uses a CDN that never seems to be down (unless there is about to be a major product announcement.) It would be great to have some hard, factual data because I don't believe that we need to unnecessarily hurt ourselves on these metrics. We are making business decisions based on these numbers. I can say, however, given that these metrics are visible to management, issues get addressed and resolved pretty fast (read: we cut through the red-tape pretty quick.) Unfortunately, as a developer, I don't want management to think that the application is up or down because some external factor (i.e., CDN) is influencing the numbers. Thoughts? (I mistakenly posted this question on StackOverflow, sorry in advance for the cross-post)

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• SVN Authentication with LDAP and Active Directory

  - by Alex Holsgrove

  I am having a few problems getting SVN authentication to work with LDAP / Active Directory. My SVN installation works fine, but after enabling LDAP in my apache vhost, I just can't get my users to authenticate. I can use a selection of LDAP browsers to successfully connect to Active Directory, but just can't seem to get this to work. SVN is setup in /var/local/svn Server is svn.domain.local For testing, my repository is /var/local/svn/test My vhost file is as follows: <VirtualHost *:80> ServerAdmin [email protected] ServerAlias svn.domain.local ServerName svn.domain.local DocumentRoot /var/www/svn/ <Location /test> DAV svn #SVNListParentPath On SVNPath /var/local/svn/test AuthzSVNAccessFile /var/local/svn/svnaccess AuthzLDAPAuthoritative off AuthType Basic AuthName "SVN Server" AuthBasicProvider ldap AuthLDAPBindDN "CN=adminuser,OU=SBSAdmin Users,OU=Users,OU=MyBusiness,DC=domain,DC=local" AuthLDAPBindPassword "admin password" AuthLDAPURL "ldap://192.168.1.6:389/OU=SBSUsers,OU=Users,OU=MyBusiness,DC=domain,DC=local?sAMAccountName?sub?(objectClass=*)" Require valid-user </Location> CustomLog /var/log/apache2/svn/access.log combined ErrorLog /var/log/apache2/svn/error.log </VirtualHost> In my error.log, I don't seem to get any bind errors (should I be looking elsewhere?), but just the following: [Thu Jun 21 09:51:38 2012] [error] [client 192.168.1.142] user alex: authentication failure for "/test/": Password Mismatch, referer: http://svn.domain.local/test/ At the end of "AuthLDAPURL", I have seen people using TLS and NONE but neither seem to help in my case. I have the ldap modules loaded and have checked as much as I know, so any help would be most welcome. Thanks

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• Annoying trackpad freeze on MacBook [solved]

  - by Hafthor

  NOTE: Question marked answered because it was forced after being put up for bounty. Actual solution was to have Apple repair it. Trackpad usually works, but sometimes stops responding for around 5 seconds and then suddenly starts working again. Seems to happen when I switch between typing and moving + button-clicking and also when I do a lot of double-clicking. Tried turning off the "Ignore accidental trackpad input". Apple replaced the keyboard/mouse under warranty. Problem remains. Any ideas? Edit: White non-unibody Late-2008 13" MacBook - fully up-to-date OS. Doesn't seem to matter if it is plugged in or not. Edit: Updated to Snow Leopard - seems to have made it worse. Edit: Applying even a little pressure to the left palm rest creates this condition. Apple replaced the top case again and this time it seems to have fixed it. Although, it looks like they may have added a spacer on the left palm rest to "fix" it.

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• RDP Connection to Windows 7 stays really slow

  - by Pavlo

  I have an Issue with connecting to Windows 7 via RDP. I can open an RDP Session, but regardless of any settings, the responce times are really long. This in particulary is the case when opening a web page in a browser. I've tried IE, Firefox and Google Chrome. I also use RDP connection to a Windows 2008 Server from the same client machine, and the speed is very normal with all features turned on. We have Gigabit Ethernet here. So I think it can not be the client's fault. What concerns Windows 7 Machine, I've tried shutting all the sraphic features off and turning the color levels to 256 colors. Result - the same. If I work locally on the machine - I can not see any lags. What else have I tried: Using old RDP 5 Client from Microsoft Setting network autotuninglevel as seen here Do You have some ideas? Thanks in advance! Update the problem seems to be with rendering window contents. All the window borders and pannes are rendered pretty quickly, but the content shows up very slowly. Also mouse movements are recognised by the Win 7 box only after some period. Are there some hidden settings in the RDP, where one could turn some advanced features off or turn some caching on? I use Bitmap Caching, but this apparently doesn't help.

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• ADFS Relying Party

  - by user49607

  I'm trying to set up an Active Directory Federation Service Relying Party and I get the following error. I've tried modifying the page to allow <pages validateRequest="false"> to web.config and it doesn't make a difference. Can someone help me out? Server Error in '/test' Application. A potentially dangerous Request.Form value was detected from the client (wresult="<t:RequestSecurityTo..."). Description: Request Validation has detected a potentially dangerous client input value, and processing of the request has been aborted. This value may indicate an attempt to compromise the security of your application, such as a cross-site scripting attack. To allow pages to override application request validation settings, set the requestValidationMode attribute in the httpRuntime configuration section to requestValidationMode="2.0". Example: <httpRuntime requestValidationMode="2.0" />. After setting this value, you can then disable request validation by setting validateRequest="false" in the Page directive or in the <pages> configuration section. However, it is strongly recommended that your application explicitly check all inputs in this case. For more information, see http://go.microsoft.com/fwlink/?LinkId=153133. Exception Details: System.Web.HttpRequestValidationException: A potentially dangerous Request.Form value was detected from the client (wresult="<t:RequestSecurityTo..."). Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace: [HttpRequestValidationException (0x80004005): A potentially dangerous Request.Form value was detected from the client (wresult="<t:RequestSecurityTo...").] System.Web.HttpRequest.ValidateString(String value, String collectionKey, RequestValidationSource requestCollection) +11309476 System.Web.HttpRequest.ValidateNameValueCollection(NameValueCollection nvc, RequestValidationSource requestCollection) +82 System.Web.HttpRequest.get_Form() +186 Microsoft.IdentityModel.Web.WSFederationAuthenticationModule.IsSignInResponse(HttpRequest request) +26 Microsoft.IdentityModel.Web.WSFederationAuthenticationModule.CanReadSignInResponse(HttpRequest request, Boolean onPage) +145 Microsoft.IdentityModel.Web.WSFederationAuthenticationModule.OnAuthenticateRequest(Object sender, EventArgs args) +108 System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +80 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +266 `

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