Brian Behlendorf 9dcb971983 Log I/Os longer than zio_delay_max (30s default) ... There have been reports of ZFS deadlocking due to what appears to be a lost IO. This patch addes some debugging to determine the exact state of the IO which neither 1) completed, 2) failed, or 3) timed out after zio_delay_max (30) seconds. This information will be logged using the ZFS FMA infrastructure as a 'delay' event and posted to the internal zevent log. By default the last 64 events will be kept in the log but the limit is configurable via the zfs_zevent_len_max module option. To dump the contents of the log use the 'zpool events -v' command and look for the resource.fs.zfs.delay event. It will include various information about the pool, vdev, and zio which may shed some light on the issue. In the context of this change the 120 second kernel blocked thread watchdog has been disabled for synchronous IOs. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #930		2012-11-02 15:45:59 -07:00
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Makefile.am	Add the release component to headers	2012-01-18 12:19:47 -08:00
zfs.h	Log I/Os longer than zio_delay_max (30s default)	2012-11-02 15:45:59 -07:00