Re: Direct/Buffered I/O

From: <mccmx_at_hotmail.com>
Date: 19 Jul 2005 00:45:49 -0700
Message-ID: <1121759149.106137.279090@f14g2000cwb.googlegroups.com>

Found the solution:

If you run sar -b (with a suitable interval) and then run the i/o operation you can determine whether the data is being seved via the OS buffer cache by checking the first 3 columns (bread/s,lread/s, and %rcache).

bread/s is the number of blocks read in from the disk, lread/s is the number of blocks read in from the OS cache, and %rcache is the OS buffer cache hit ratio.

Matt Received on Tue Jul 19 2005 - 02:45:49 CDT