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It scrubbed up good

August 28, 2008

Since the home server has been snapping regularly I have had to choose between snapshots and scrubbing and I chose snapshots. User error is more likely than hardware failures and scrubbing is really about seeing those errors sooner so you don’t get a unrecoverable failure due to having two problems at once. However I would rather not have to choose.

So I was particularly pleased to see that build 94 contains the fix for this bug:

6343667 scrub/resilver has to start over when a snapshot is taken

So today the home server had it´s first scrub in years and it scrubbed up well:

: pearson FSS 5 $; pfexec zpool status   pool: tank  state: ONLINE status: The pool is formatted using an older on-disk format.  The pool can         still be used, but some features are unavailable. action: Upgrade the pool using ‘zpool upgrade’.  Once this is done, the         pool will no longer be accessible on older software versions.  scrub: scrub completed after 12h42m with 0 errors on Thu Aug 28 20:12:36 2008 config:          NAME        STATE     READ WRITE CKSUM         tank        ONLINE       0     0     0           mirror    ONLINE       0     0     0             c1d0s7  ONLINE       0     0     0             c5d0s7  ONLINE       0     0     0  errors: No known data errors : pearson FSS 6 $;  

When I upgrade the pool, after the other live upgrade boot environment can support this pool version, there is the promise of a faster scrub but since this scrub happened during the day and I also backed up the pool using zfs_backup during the same time.

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