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[dm-devel] iostate and dm-multipath devices

From: "Stepan, Troy" <troy stepan unisys com>
To: <dm-devel redhat com>
Subject: [dm-devel] iostate and dm-multipath devices
Date: Fri, 18 Aug 2006 11:28:41 -0400

Hi.

How does the kernel collect I/O statistics for dm-multipath devices?  I
would expect it to sum up the stats from the underlying SCSI targets.
However, when using iostat, some values (like tps) don't compute.  Any
thoughts on this one?

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