freebsd-skq/sys/cddl
asomers e20ec88791 MFV r323789: 8473 scrub does not detect errors on active spares
illumos/illumos-gate@554675eee7
554675eee7

https://www.illumos.org/issues/8473
Scrubbing is supposed to detect and repair all errors in the pool. However,
it wrongly ignores active spare devices. The problem can easily be
reproduced in OpenZFS at git rev 0ef125d with these commands:

truncate -s 64m /tmp/a /tmp/b /tmp/c
sudo zpool create testpool mirror /tmp/a /tmp/b spare /tmp/c
sudo zpool replace testpool /tmp/a /tmp/c
/bin/dd if=/dev/zero bs=1024k count=63 oseek=1 conv=notrunc of=/tmp/c
sync
sudo zpool scrub testpool
zpool status testpool # Will show 0 errors, which is wrong
sudo zpool offline testpool /tmp/a
sudo zpool scrub testpool
zpool status testpool # Will show errors on /tmp/c,
		      # which should've already been fixed

FreeBSD head is partially affected: the first scrub will detect some errors, but the second scrub will detect more.

Reviewed by: Andy Stormont <astormont@racktopsystems.com>
Reviewed by: Matt Ahrens <mahrens@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Approved by: Richard Lowe <richlowe@richlowe.net>

MFC after:	1 week
Sponsored by:	Spectra Logic Corp
2017-09-20 16:31:00 +00:00
..
boot/zfs loader should support large_dnode 2017-09-12 13:45:04 +00:00
compat/opensolaris dounmount: do not release the mount point's reference on the covered vnode 2017-09-14 08:47:06 +00:00
contrib/opensolaris MFV r323789: 8473 scrub does not detect errors on active spares 2017-09-20 16:31:00 +00:00
dev Enable dtrace support for mips64 and the ERL kernel config 2017-09-06 03:19:52 +00:00