System hang due to high iowait
Wayne Pinette
Wpinette at cariboo.bc.ca
Mon Oct 4 15:19:15 UTC 2004
I had a similar problem and did a google search on it a while back. I
found this little snippet and
tried it and have never had a problem since :
In your rc.d/rc.local file append the following two lines :
echo 100 > /proc/sys/vm/inactive_clean_percent
echo 2 10 20 > /proc/sys/vm/pagecache
I would give this a try.
Wayner
>>> csu4 at fedex.com 04/10/2004 1:46:04 am >>>
Hi there,
Could anyone help to find the system hung problem? The box
is running RHEL 3AS Update3. Whenever I do a massive data
transfer (such as rcp from another box to this box), after
certain time (around six to seven hours), this box would
hang up. I could see the top output even it's hung, and it
showed that the iowait is 99% and system contributed another
1% making the server moving nowhere.
The box connected to a HP MSA500 Smart Array Storage, thru
multipath (I enabled it following the user guide) connection.
The filesystem is ext3 format. Any problem here?
Thx & Rgds,
SCHYU
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