> On Jan 21, 2016, at 4:25 AM, Fred Liu <[email protected]> wrote:
zfs deadman timer is tunable. But if you hit it, you've got problems that tuning
the deadman won't help.
The tunable is zfs_deadman_synctime_ms, which is milliseconds.
For example, on a test machine here:
[root@elvis ~]# echo zfs_deadman_synctime_ms/D | mdb -k
zfs_deadman_synctime_ms:
zfs_deadman_synctime_ms: 1000000
FYI, you can check on the state of I/Os in the ZIO pipeline and how long they've
been there using the zio_state dcmd. Elvis is not currently busy or broken, but
here
is an example:
[root@elvis ~]# echo ::zio_state | mdb -k
ADDRESS TYPE STAGE WAITER
TIME_ELAPSED
ffffff01ada853e0 NULL OPEN - -
ffffff01ada85b10 NULL OPEN - -
If you see a large TIME_ELAPSED, you can track down the zio in question for more
debugging.
-- richard
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