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Full Discussion: Disk performance problem on login
Operating Systems Linux Red Hat Disk performance problem on login Post 302455372 by dangral on Tuesday 21st of September 2010 11:35:34 AM
Old 09-21-2010
Disk performance problem on login
Running CentOS 5.5:
Quote:
Linux mythbox 2.6.18-194.11.3.el5 #1 SMP Mon Aug 30 16:23:24 EDT 2010 i686 i686 i386 GNU/Linux
I've come across a relatively recent problem, where in the last 2 months or so, the root disk goes to 99% utilization for about 20 seconds when a user logs in. This occurs whether a user logs in locally or via ssh. I have tried using lsof to track down the process that is pegging the disk, but no results are returned until the disk thrashing is over, and I don't get any useful results. So I'm looking for a way to proactively narrow down the problem. Here is some more info:
Quote:

# mount
/dev/hdb3 on / type ext3 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/hdb1 on /boot type ext3 (rw)
/dev/hda on /videos type xfs (rw,allocsize=256m,logbufs=4)
tmpfs on /dev/shm type tmpfs (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
Quote:
# df -k
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/hdb3 23412640 18685492 3518660 85% /
/dev/hdb1 101086 48046 47821 51% /boot
/dev/hda 312440128 222170800 90269328 72% /videos
tmpfs 386724 0 386724 0% /dev/shm
 

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