Author: mav
Date: Mon Mar 21 00:28:13 2016
New Revision: 297122
URL: https://svnweb.freebsd.org/changeset/base/297122
Log:
MFC r296613: Make ZFS more picky to GEOM stripe sizes and offsets.
Use of misaligned or non-power-of-2 stripes is not really useful for ZFS,
since increased ashift won't help to avoid read-modify-write cycles, and
only reduce pool space efficiency and compression rates.
Modified:
stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_geom.c
Directory Properties:
stable/10/ (props changed)
Modified: stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_geom.c
==============================================================================
--- stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_geom.c
Mon Mar 21 00:27:00 2016 (r297121)
+++ stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_geom.c
Mon Mar 21 00:28:13 2016 (r297122)
@@ -802,7 +802,8 @@ vdev_geom_open(vdev_t *vd, uint64_t *psi
*/
*logical_ashift = highbit(MAX(pp->sectorsize, SPA_MINBLOCKSIZE)) - 1;
*physical_ashift = 0;
- if (pp->stripesize)
+ if (pp->stripesize > (1 << *logical_ashift) && ISP2(pp->stripesize) &&
+ pp->stripeoffset == 0)
*physical_ashift = highbit(pp->stripesize) - 1;
/*
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