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[dilan <dilanasanga.x@xxxxxxxxx>]

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)

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