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Add zfs_scan_ignore_errors tunable

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When it's set, a DTL range will be cleared even if its scan/scrub had
errors.  This allows to work around resilver/scrub upon import when the
pool has errors.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tim Chase <tim@chase2k.com>
Closes #7293
This commit is contained in:
Tim Chase 2018-03-13 12:43:14 -05:00 committed by Tony Hutter
parent 6059ba27c4
commit c234706270
2 changed files with 30 additions and 0 deletions
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14
man/man5/zfs-module-parameters.5
View File

@ -1699,6 +1699,20 @@ at least this much time working on a resilver between txg flushes.
Default value: \fB3,000\fR. Default value: \fB3,000\fR.
.RE .RE
.sp
.ne 2
.na
\fBzfs_scan_ignore_errors\fR (int)
.ad
.RS 12n
If set to a nonzero value, remove the DTL (dirty time list) upon
completion of a pool scan (scrub) even if there were unrepairable
errors. It is intended to be used during pool repair or recovery to
stop resilvering when the pool is next imported.
.sp
Default value: \fB0\fR.
.RE
.sp .sp
.ne 2 .ne 2
.na .na

16
module/zfs/vdev.c
View File

@ -66,6 +66,12 @@ unsigned int zfs_delays_per_second = 20;
*/ */
unsigned int zfs_checksums_per_second = 20; unsigned int zfs_checksums_per_second = 20;
/*
* Ignore errors during scrub/resilver. Allows to work around resilver
* upon import when there are pool errors.
*/
int zfs_scan_ignore_errors = 0;
/* /*
* Virtual device management. * Virtual device management.
*/ */
@ -1961,6 +1967,12 @@ vdev_dtl_reassess(vdev_t *vd, uint64_t txg, uint64_t scrub_txg, int scrub_done)
mutex_enter(&vd->vdev_dtl_lock); mutex_enter(&vd->vdev_dtl_lock);
/*
* If requested, pretend the scan completed cleanly.
*/
if (zfs_scan_ignore_errors && scn)
scn->scn_phys.scn_errors = 0;
/* /*
* If we've completed a scan cleanly then determine * If we've completed a scan cleanly then determine
* if this vdev should remove any DTLs. We only want to * if this vdev should remove any DTLs. We only want to
@ -3795,5 +3807,9 @@ module_param(zfs_checksums_per_second, uint, 0644);
MODULE_PARM_DESC(zfs_checksums_per_second, "Rate limit checksum events " MODULE_PARM_DESC(zfs_checksums_per_second, "Rate limit checksum events "
"to this many checksum errors per second (do not set below zed" "to this many checksum errors per second (do not set below zed"
"threshold)."); "threshold).");
module_param(zfs_scan_ignore_errors, int, 0644);
MODULE_PARM_DESC(zfs_scan_ignore_errors,
"Ignore errors during resilver/scrub");
/* END CSTYLED */ /* END CSTYLED */
#endif #endif