> On Apr 7, 2017, at 8:26 PM, John Barfield <john.barfi...@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: z...@lists.illumos.org. Dan _______________________________________________ OmniOS-discuss mailing list OmniOS-discuss@lists.omniti.com http://lists.omniti.com/mailman/listinfo/omnios-discuss