# [OmniOS-discuss] ZPOOL bug after upgrade to r151020

Dan McDonald danmcd at omniti.com
Sun Apr 9 23:55:47 UTC 2017

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    > On Apr 7, 2017, at 8:26 PM, John Barfield <john.barfield at bissinc.com> wrote:
    >
    > Greetings,
    >
    > I just want to report that after a clean istall of r151020 I found a bug whereby importing an older zpool from r151012 and running zpool upgrade causes an SSD cache device size to be reported incorrectly. (only 1 out of 4 devices in this instance)
    >
    > The cache device size is 93gb and arcstat reported it to be 680gb.
    >
    > I confirmed by monitoring zpool iostat -v and saw the same size being reported.
    >
    > We've had a lot of weird io lockups (which is how I found the issue, we didnt notice it until a month after) that brings all of our NFS mounts to a screeching halt and this was the only thing I could find to be out of the ordinary on the system.
    >
    > CPU average @1% , 20% of ram free, no crazy processes waiting on IO. It was completely invisible. At least from my testing using several dtrace scripts from the net.
    >
    > I can only assume that the incorrect size reporting caused the zpool to fill the cache drive up beyond its physical capacity during periods of heavy load.
    >
    > I removed all cache devices and then added them back to the zpool. Then all disks reported correctly again. Format/diskinfo always reported correctly so it was specific to zfs.
    >
    > We're monitoring the NAS closely to see if the issues occur again.

    The only thing I could find that might address the symptoms you see is this:

    	https://illumos.org/issues/7504

    Which didn't make it upstream in time to hit r151020.

    You should forward this on to the illumos ZFS developers' list:  zfs at lists.illumos.org.

    Dan

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