Date: Tue, 8 Nov 2016 17:33:21 +0100 From: Jean-Marc.LACROIX@unice.fr To: freebsd-fs@freebsd.org Subject: FreeBSD 11.0 + ZFSD Message-ID: <5521603a-65ef-7b79-4fa8-4315e1d9c7f8@unice.fr>
next in thread | raw e-mail | index | archive | help
Hello,
We are testing the mecanism of ZFSD on the latest FresBSD 11.0. In
order to do that,
we have created a VMware virtual machine with 5 disk:
- 1 disk for the system OS
- 3 disks for the raidz1 pool
- 1 disk for spare
So modified /etc/rc.conf to have the daemon start at boot, and rebooted.
Then (in the the virtual machine parameters, to simulate a disk failure)
we removed a disk of the pool
We can see that ZFSD proceed to the replacement of the UNAVAILABLE disk
by the spare disk.
and complete the resilver.
Then, we removed (in the the virtual machine parameters) a second disk
of the pool
=> the pool is marked as UNAVAIL, if we try, for example, to cd to a
filesystem in the pool,
it crashed completely, we have to kill the terminal, and reconnect the
server.
But if we issue a zpool clear zpool command, The pool status change
state from UNAVAIL to DEGRADED as shown below:
root@pcmath228:~ # zpool status
pool: zpool
state: DEGRADED
status: One or more devices has experienced an error resulting in data
corruption. Applications may be affected.
action: Restore the file in question if possible. Otherwise restore the
entire pool from backup.
see: http://illumos.org/msg/ZFS-8000-8A
scan: resilvered 328M in 0h0m with 0 errors on Tue Nov 8 16:24:50 2016
config:
NAME STATE READ WRITE CKSUM
zpool DEGRADED 0 0 0
raidz1-0 DEGRADED 0 0 0
spare-0 DEGRADED 0 0 0
16161479624068136764 REMOVED 0 0 0 was /dev/da1
da4 ONLINE 0 0 0
7947336420112974466 REMOVED 0 0 0 was /dev/da2
da3 ONLINE 0 0 0
spares
16893112194374399469 INUSE was /dev/da4
errors: 2 data errors, use '-v' for a list
pool: zroot
state: ONLINE
scan: none requested
config:
NAME STATE READ WRITE CKSUM
zroot ONLINE 0 0 0
da0p3 ONLINE 0 0 0
errors: No known data errors
Anyway it is said :"One or more devices has experienced an error
resulting in data corruption."
but a cd to a filesystem of the pool doesn't crashed anymore.
So the questions:
- why we have to issue a zpool clear in order to recover a "working" pool ?
- is it normal to have possible data corruption (as said in the
message), what it means exactly ?
As we understood normaly the pool should recover enough redondancy
informations to have a fonctional one,
and without possible data corruption, no ?
Thank for you help,
Best regards
Jean-Marc & Roland
--
LACROIX Jean-Marc office: W612
Administrateur Systèmes et Réseaux LJAD
phone: 04.92.07.62.51 fax: 04.93.51.79.74
email: jml@unice.fr
Address: Laboratoire J.A.Dieudonne - UMR CNRS 7351
Universite de Nice Sophia-Antipolis
Parc Valrose - 06108 Nice Cedex 2 - France
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?5521603a-65ef-7b79-4fa8-4315e1d9c7f8>