Do you have the write back cache enabled on the iscsi lun? If you do, that will turn all sync writes into async.

Tristan


Roman Naumenko wrote:
This is comstar+itadm configuration, so iscsitgt is not used. There is no 
driver for storage, it's JBOD on Adaptec raid controller.

And bottom of the problem is: nfs makes async writes always (copying files, 
bonnie++, any other writing activity), I see it right away on iostat for ssd 
device.

Windows initiator doesn't produce any of such writes - on synthetic tests I've tried and with yours sqlio.
We'll put an exchange db on that volume and see the difference, but for me it's 
quite strange situation.

--
Roman
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