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MFV r246394:

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Add tunable to allow block allocation on degraded vdevs.

Illumos ZFS issues:
  3507 Tunable to allow block allocation even on degraded vdevs

References:
  https://www.illumos.org/issues/3507

MFC after:	2 weeks
This commit is contained in:
Martin Matuska 2013-02-11 13:59:57 +00:00
commit bb03847418
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=246675
1 changed files with 14 additions and 1 deletions
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15
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/metaslab.c
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@ -21,6 +21,7 @@
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012 by Delphix. All rights reserved.
* Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
*/
#include <sys/zfs_context.h>
@ -96,6 +97,15 @@ int metaslab_prefetch_limit = SPA_DVAS_PER_BP;
*/
int metaslab_smo_bonus_pct = 150;
/*
* Should we be willing to write data to degraded vdevs?
*/
boolean_t zfs_write_to_degraded = B_FALSE;
SYSCTL_INT(_vfs_zfs, OID_AUTO, write_to_degraded, CTLFLAG_RW,
&zfs_write_to_degraded, 0,
"Allow writing data to degraded vdevs");
TUNABLE_INT("vfs.zfs.write_to_degraded", &zfs_write_to_degraded);
/*
* ==========================================================================
* Metaslab classes
@ -1383,10 +1393,13 @@ metaslab_alloc_dva(spa_t *spa, metaslab_class_t *mc, uint64_t psize,
/*
* Avoid writing single-copy data to a failing vdev
* unless the user instructs us that it is okay.
*/
if ((vd->vdev_stat.vs_write_errors > 0 ||
vd->vdev_state < VDEV_STATE_HEALTHY) &&
d == 0 && dshift == 3) {
d == 0 && dshift == 3 &&
!(zfs_write_to_degraded && vd->vdev_state ==
VDEV_STATE_DEGRADED)) {
all_zero = B_FALSE;
goto next;
}