I have a question about using mixed vdev in the same zpool and what the
community opinion is on the matter. Here is my setup:
I have four 1TB drives and two 500GB drives. When I first setup ZFS I was
under the assumption that it does not really care much on how you add devices
to the pool and it assumes you are thinking things through. But when I tried
to create a pool (called group) with four 1TB disk in raidz and two 500GB disk
in mirror configuration to the same pool ZFS complained and said if I wanted to
do it I had to add a -f (which I assume stands for force). So was ZFS
attempting to stop me from doing something generally considered bad?
Some other questions I have, lets assume that this setup isn't that bad (or it
is that bad and these questions will be why):
If one 500GB disk dies (c10dX) in the mirror and I choose not to replace it,
would I be able to migrate the files that are on the other mirror that still
works over to the drives in the raidz configuration assuming there is space?
Would ZFS inform me which files are affected, like it does in other situations?
In this configuration how does Solaris/ZFS determine which vdev to place the
current write operations worth of data into?
Is there any situations where data would, for some reason, not be protected
against single disk failures?
Would this configuration survive a two disk failure if the disk are in a
separate vdev?
jsm...@corax:~# zpool status group
pool: group
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
group ONLINE 0 0 0
..raidz1 ONLINE 0 0 0
....c7t0d0 ONLINE 0 0 0
....c7t1d0 ONLINE 0 0 0
....c8t0d0 ONLINE 0 0 0
....c8t1d0 ONLINE 0 0 0
..mirror ONLINE 0 0 0
....c10d0 ONLINE 0 0 0
....c10d1 ONLINE 0 0 0
errors: No known data errors
jsm...@corax:~# zfs list group
NAME USED AVAIL REFER MOUNTPOINT
group 94.4K 3.12T 23.7K /group
This isn't for a production environment in some datacenter but nevertheless I
would like to make the data as reasonably secure as possible while maximizing
total storage space.
--
This message posted from opensolaris.org
_______________________________________________
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
