Hi All, I have also setup the same environment at my office for developers to work with JAVA and PHP etc., which was very slow initially.
Later I came to know programs like Netbeans, firefox, Chrome and systems logged in users cache is created in users home (as hidden directories) itself and when there are lot of users logged into system, huge amount of disk I/O goes due to the data operations. Because all users are writing to their homes which is in the same disk (I have setup raid 1 there) What I simply did was moved all those caching directories to users local hard disk and created symbolic links to them. This gave a significant performance improvement. like this root@rcapladm:/home/dilan# pwd /home/dilan root@rcapladm:/home/dilan# ls -la lrwxrwxrwx 1 dilan users 25 May 5 09:55 .local -> /rcapl/home/dilan/.local lrwxrwxrwx 1 dilan users 27 May 5 09:55 .mozilla -> /rcapl/home/dilan/.mozilla lrwxrwxrwx 1 dilan users 25 Aug 18 08:37 .mysql -> /rcapl/home/dilan/.mysql lrwxrwxrwx 1 dilan users 29 Aug 18 08:38 .mysqlgui -> /rcapl/home/dilan/.mysqlgui/ lrwxrwxrwx 1 dilan users 28 May 5 09:55 .netbeans -> /rcapl/home/dilan/.netbeans lrwxrwxrwx 1 dilan users 34 May 5 09:55 .netbeans-derby -> /rcapl/home/dilan/.netbeans-derby Because now their caching (which uses most of disk IO ) is now not at server, and it is in local machine server does not have lots of disk IO. Still when a java application compiles using "mvn clean compile", compilation was slow. I also applied a simple trick in their pom.xml to set the compilation location not in the server but in the local machine. Then that was also fast. So all their source codes are in server, protected. I don't say system is 100 perfect at all. Still little slowness is there. Still my biggest problem is, if any users network is gone, suddenly the nfs mount goes off and system gets stuck with increasing load. I cannot see any program using system load when I check with "top" command , but system gets stuck and even network comes back, it is not re mounting the users home automatically 90 times out of 100. Even we cannot do it manually. Because when I type "df -h", it shows nothing but trying to get mount information. Any Idea or solution. ? Thanks all. Specks of my NFS & LDAP server. Cor2Duo Intel, 4 GB RAM, 500 HD (Normal) with RAID 1. Around 10 Users working this Environment. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/879334 Title: nfsd from nfs-kernel-server very slow and system load from 25%-100% from nfsd Status in “linux” package in Ubuntu: Incomplete Status in “nfs-utils” package in Ubuntu: Confirmed Status in “linux” package in Debian: Fix Released Bug description: I have a diskless ubuntu 10.10 machine which I boot regularly using pxe-boot from another ubuntu machine where I have the root filesystem of the diskless machine exported over nfs. I set it up about a year ago using 10.10. In the mean while the server machine got upgraded to 11.04 and as of yesterday to 11.10. After the upgrade to 11.10 the diskless machine is dead slow (most of the times it wont even boot completely) and the load on the server machine is high (25%-100% as shown from top). If in the middle of the diskless computer booting I do a restart of the nfs server, the client computer proceeds with the boot a bit more and then it gets stuck again. I have to restart and nfs-server 3-4 times in order to get the gdm login screen at the client machine ProblemType: Bug DistroRelease: Ubuntu 11.10 Package: nfs-kernel-server 1:1.2.4-1ubuntu2 ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4 Uname: Linux 3.0.0-12-generic i686 ApportVersion: 1.23-0ubuntu3 Architecture: i386 Date: Fri Oct 21 12:53:02 2011 ProcEnviron: LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: nfs-utils UpgradeStatus: Upgraded to oneiric on 2011-10-20 (1 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/879334/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
