Re: 99% IOWAIT with Oracle RAC 10g (10.1.0.4) on Linux

From: <mccmx_at_hotmail.com>
Date: 13 Jun 2005 06:50:54 -0700
Message-ID: <1118670654.246294.93120@f14g2000cwb.googlegroups.com>

More info:

When the IOWAIT goes to 100%, I run the following command to find the processes that are waiting on I/O:

ps -aux |grep D (The 'D' is for uninteruptable sleep state - which can be I/O read requests)

This gives me 2 processes:

evmd and
ocssd.bin

The ocssd.bin process is the first to enter the 'D' state.....I have used 'strace' on both of these processes. When the IOWAIT is high (99%), I see delayed pwrite() calls. When the IOWAIT drops back down, the same pwrite() calls execute very quickly.

Any ideas..?

Matt Received on Mon Jun 13 2005 - 08:50:54 CDT