# [OmniOS-discuss] iSCSI traffic suddenly comes to a halt and then resumes

Richard Elling richard.elling at richardelling.com
Sat May 9 00:49:52 UTC 2015

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    > On May 5, 2015, at 9:48 AM, Matej Zerovnik <matej at zunaj.si> wrote:
    >
    > I will replace the hardwarw in about 4 months with all SAS drives, but I would love to have a working setup for the time being as well;)
    >
    > I looked at smart stats and there doesnt seem to be any errors. Also, no hard/soft/transfer error reported by any drive. Will take a look at service time tomorrow, maybe put the drives to graphite and look at them over a longer period.
    >
    > I looked at iostat -x status today and stats for pool itself reported 100% busy most of the time, 98-100% wait, 500-1300 transactions in queue, around 500 active,... First line, that is average from boot, says avg service time.is around 1600ms which seems like aaaalot. Can it be due to really big queue?
    >
    > Would it help to create 5 10drives raidz pools instead of one with 50 drives?

    It is a bad idea to build a single raidz set with 50 drives. Very bad. Hence the zpool
    man page says, "The recommended number is between 3 and 9 to help increase performance."
    But this recommendation applies to reliability, too.
     -- richard

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