mirror_zfs/man
Don Brady 8afac5dc55 Avoid posting duplicate zpool events
Duplicate io and checksum ereport events can misrepresent that
things are worse than they seem. Ideally the zpool events and the
corresponding vdev stat error counts in a zpool status should be
for unique errors -- not the same error being counted over and over.
This can be demonstrated in a simple example. With a single bad
block in a datafile and just 5 reads of the file we end up with a
degraded vdev, even though there is only one unique error in the pool.

The proposed solution to the above issue, is to eliminate duplicates
when posting events and when updating vdev error stats. We now save
recent error events of interest when posting events so that we can
easily check for duplicates when posting an error.

Reviewed by: Brad Lewis <brad.lewis@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Don Brady <don.brady@delphix.com>
Closes #10861
2020-09-09 10:26:00 -07:00
..
man1 man: Canonicalize .TH usage 2020-08-24 21:25:28 -07:00
man5 Avoid posting duplicate zpool events 2020-09-09 10:26:00 -07:00
man8 Add 'zfs rename -u' to rename without remounting 2020-09-03 16:16:15 -07:00
Makefile.am Prepare SPL repo to merge with ZFS repo 2018-05-29 14:51:39 -07:00