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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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LEARN ABOUT OPENSOLARIS

dev

dev(7FS)							   File Systems 							  dev(7FS)

NAME

       dev - Device name file system

DESCRIPTION

       The  dev  filesystem  manages  the  name  spaces  of devices under the Solaris operating environment. The global zone's instance of the dev
       filesystem is mounted during boot on /dev.

       A subdirectory under /dev may have unique operational semantics. Most of the common device names under /dev are	created  automatically	by
       devfsadm(1M).   Others,	such  as  /dev/pts,  are dynamic and reflect the operational state of the system. You can manually generate device
       names for newly attached hardware by invoking devfsadm(1M) or implicitly, by indirectly causing	a  lookup  or  readdir	operation  in  the
       filesystem to occur.  For example, you can discover a disk that was attached when the system was powered down (and generate a name for that
       device) by invoking format(1M)).

FILES

       /dev    Mount point for the /dev filesystem in the global zone.

SEE ALSO

       devfsadm(1M), format(1M), devfs(7FS)

NOTES

       The global /dev instance cannot be unmounted.

SunOS 5.11							    9 June 2006 							  dev(7FS)
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