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Avoid posting duplicate zpool events

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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
This commit is contained in:
Don Brady
2020-09-04 11:34:28 -06:00
committed by GitHub
parent 3808032489
commit 4f07282786
22 changed files with 799 additions and 79 deletions
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include/sys/fm/util.h
+3
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@@ -104,6 +104,9 @@ extern int zfs_zevent_seek(zfs_zevent_t *, uint64_t);
extern void zfs_zevent_init(zfs_zevent_t **);
extern void zfs_zevent_destroy(zfs_zevent_t *);
extern void zfs_zevent_track_duplicate(void);
extern void zfs_ereport_init(void);
extern void zfs_ereport_fini(void);
#else
static inline void fm_init(void) { }