Re: [Iscsitarget-devel] IET Performance

[Chris S. <ck...@cs...>]

| Just wondering what kind of performance people are getting out of
| their IET SANs.  I have just run a disk IO test on my windows server
| 2008 R2 server using sqlio and got the following results:

 Aggregate IET throughput in our environment can saturate two
one-gigabit Ethernet links; this takes simultaneous IO from multiple
disks at once.  On a disk that I can conveniently test on right now, I
can get an older version of Solaris 10 to do somewhat over half of the
single-disk read bandwidth (although I'm not sure I'm testing this in
the optimal way); 67 Mbytes/sec over iSCSI versus 110 MBytes/sec on the
iSCSI backend itself.

 Single-disk random IO is of course seek-limited. Our environment can
easily saturate the seek rate of hard disks; I haven't tested with SSDs.

(We are using blockio with the deadline scheduler.)

	- cks