I would have never though a write to /dev/zero would work...I learn
something new every day.
Can you try this test writing to /dev/null?
From: Jesse, Rich [mailto:Rich.Jesse_at_qg.com]
Sent: Tuesday, December 12, 2006 7:16 AM
To: kevinc_at_polyserve.com; oracle-l
Subject: RE: I/O and db_file_multiblock_read_count
I'm guessing that I'm limited by CPU on this IBM JS21 blade's
LPAR (MPV, 2 cores max) with an SVC (virtualized SAN) backend. topas
showed kernel mode CPU >95% for most of the tests.
/oracle $ time dd if=S.dbf of=/dev/zero bs=1024k
16384+1 records in
16384+1 records out
real 1m3.044s
user 0m0.271s
sys 0m42.458s
/oracle $ time dd if=S.dbf of=/dev/zero bs=1024k
16384+1 records in
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Received on Tue Dec 12 2006 - 11:35:03 CST
