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Illumos #2671: zpool import should not fail if vdev ashift has increased

Reviewed by: Adam Leventhal <>
Reviewed by: Eric Schrock <>
Reviewed by: Richard Elling <>
Reviewed by: Gordon Ross <>
Reviewed by: Garrett D'Amore <>
Approved by: Richard Lowe <>

Refererces to Illumos issue:

This patch has been slightly modified from the upstream Illumos
version.  In the upstream implementation a warning message is
logged to the console.  To prevent pointless console noise this
notification is now posted as a "ereport.fs.zfs.vdev.bad_ashift"

The event indicates a non-optimial (but entirely safe) ashift
value was used to create the pool.  Depending on your workload
this may impact pool performance.  Unfortunately, the only way
to correct the issue is to recreate the pool with a new ashift.

NOTE: The unrelated fix to the comment in zpool_main.c appears
in the upstream commit and was preserved for consistnecy.

Ported-by: Cyril Plisko <>
Reworked-by: Brian Behlendorf <>
Closes #955
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George Wilson authored and behlendorf committed May 3, 2012
1 parent 3997bc7 commit 32a9872bbae90a7cd9793c371f558701ec268976
Showing with 15 additions and 6 deletions.
  1. +1 −1 cmd/zpool/zpool_main.c
  2. +2 −0 include/sys/fm/fs/zfs.h
  3. +8 −5 module/zfs/vdev.c
  4. +4 −0 module/zfs/zfs_fm.c
@@ -3736,7 +3736,7 @@ print_dedup_stats(nvlist_t *config)

* If the pool was faulted then we may not have been able to
* obtain the config. Otherwise, if have anything in the dedup
* obtain the config. Otherwise, if we have anything in the dedup
* table continue processing the stats.
if (nvlist_lookup_uint64_array(config, ZPOOL_CONFIG_DDT_OBJ_STATS,
@@ -47,6 +47,7 @@ extern "C" {
#define FM_EREPORT_ZFS_DEVICE_BAD_GUID_SUM "vdev.bad_guid_sum"
#define FM_EREPORT_ZFS_DEVICE_TOO_SMALL "vdev.too_small"
#define FM_EREPORT_ZFS_DEVICE_BAD_LABEL "vdev.bad_label"
#define FM_EREPORT_ZFS_DEVICE_BAD_ASHIFT "vdev.bad_ashift"
#define FM_EREPORT_ZFS_DEVICE_REMOVE "vdev.remove"
#define FM_EREPORT_ZFS_DEVICE_CLEAR "vdev.clear"
#define FM_EREPORT_ZFS_DEVICE_CHECK "vdev.check"
@@ -71,6 +72,7 @@ extern "C" {
@@ -1271,13 +1271,16 @@ vdev_open(vdev_t *vd)
vd->vdev_ashift = MAX(ashift, vd->vdev_ashift);
} else {
* Make sure the alignment requirement hasn't increased.
* Detect if the alignment requirement has increased.
* We don't want to make the pool unavailable, just
* post an event instead.
if (ashift > vd->vdev_top->vdev_ashift) {
vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
return (EINVAL);
if (ashift > vd->vdev_top->vdev_ashift &&
vd->vdev_ops->vdev_op_leaf) {
spa, vd, NULL, 0, 0);

vd->vdev_max_asize = max_asize;

@@ -267,6 +267,10 @@ zfs_ereport_start(nvlist_t **ereport_out, nvlist_t **detector_out,
DATA_TYPE_STRING, vd->vdev_fru, NULL);
if (vd->vdev_ashift)
DATA_TYPE_UINT64, vd->vdev_ashift, NULL);

if (pvd != NULL) {

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