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On Tue, 13 Dec 2011 02:30:14 +0000
Rustam Aliyev <rustam at code.az> wrote:

> [...] During this period, I can see 
> constant read I/O of 3MB/s on each swift device. When I shutdown 
> object-server I/O goes to zero.

Killing swift-object-server is tantamount to unplugging a disk:
the I/O goes to zero, but it was not the entity that requested the I/O.

I'd look in the logs to see if rsync was flopping around failing
or something of that nature. You need to go up the chain and see
what activity was triggering the I/O in the first place.

-- Pete