David, Thanks for your reply. Answers to your questions are below.
> Is it just ZFS hanging (or what it appears to be is > slowing down or > blocking) or does the whole system hang? <br> Only the ZFS storage is affected. Any attempt to write to it blocks until the issue passes. Other than that the system behaves normally. I have not, as far as I remember, tried writing to the root pool while this is going on, I'll have to check that next time. I suspect the problem is likely limited to a single pool. > What does iostat show during the time period of the > slowdown?<br> > What does mpstat show during the time of the > slowdown?<br> > <br> > You can look at the metadata statistics by running > the following. > echo ::arc | mdb -k<br> > When looking at a ZFS problem, I usually like to > gather > echo ::spa | mdb -k<br> > echo ::zio_state | mdb -k<br> I will plan to dump information from all of these sources next time I can catch it in the act. Any other diag commands you think might be useful? > I suspect you could drill down more with dtrace or > lockstat to see > where the slowdown is happening. I'm brand new to DTrace. I'm doing some reading now toward being in a position to ask intelligent questions. -Charles -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
