RE: I/O and db_file_multiblock_read_count
- From: "Kevin Closson" <kevinc@xxxxxxxxxxxxx>
- To: "oracle-l" <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 12 Dec 2006 09:35:03 -0800
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@xxxxxx]
Sent: Tuesday, December 12, 2006 7:16 AM
To: kevinc@xxxxxxxxxxxxx; 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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