Excessive IO wait with megaraid card 2006-11-29 - By Phil Bettinson
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Hello List,
We have a (4) sun v40z's here to run some oracle databases. They have 6
HD's in a hardware raid off of a LSI Logic MegaRAID 413Y (as cleaned
from /proc/scsi/megaraid/1)
Performance is fine doing it's main job (serving about 6 Lightly used
Oracle databases).
We are finding, however, that should you attempt to run a large tar job
on the system, all four of the quad opteron processors end up stuck with
100% IO wait (when tarring say about a 4gb oracle database).
We've tried using the megaraid2 driver which did improve things a bit,
the system is a little more responsive during the tar, but not by much.
Does anyone have any ideas?
Either how we narrow down the problem/get more info, or (ideally ;)) a
fix to our rather annoying problem? It seems to appear on all four
boxses, using RHEL U7 (installed with U0, but up2dated), and using
redhat-made drivers.
Thanks.
Phil
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Phil Bettinson
BEng, RHCT Beng, RHCT
Swyddog Gweinyddu Systemau Systems Administrator
Isadran Cyfrifiaduron Computer Section
Llyfrgell Genedlaethol Cymru National Library of Wales
Aberystwyth, Aberystwyth
Ceredigion, Ceredigion
SY23 3BU SY23 3BU
Ff?n / Phone: 01970 632867 Ffacs / Fax: 01970 615709
EBost / Email: phb@(protected) We / Web: http://www.llgc.org.uk
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Yn siarad drosof fy hun, nid LlGC - Speaking personally, not for NLW
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