I'm seeing odd behaviour when I create a ZFS raidz pool using three disks. The
output of "zpool status" shows the pool size as the size of the three disks
combined (as if it were a Raid 0 volume). This isn't expected behaviour is it?
When I create a mirrored volume in ZFS everything is as one would expect the
pool is the size of a single drive.
My setup:
Compaq DL380
Host OS: CentOS 4.3 (x86)
VMware Server Guest OS: Solaris Nevada Build 39
Host Memory: 4GB
Guest Memory: 1.5GB
Disks: 3 x 300GB Seagate SATA II drives (with ~25GB carved out of each for the
Host OS)
--
The commands I ran:
[b]bash-3.00# zpool create sata raidz c2t0d0 c2t1d0 c2t2d0
bash-3.00# zpool list
NAME SIZE USED AVAIL CAP HEALTH ALTROOT
sata 838G 108K 838G 0% ONLINE -
bash-3.00# zpool status
pool: sata
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
sata ONLINE 0 0 0
raidz ONLINE 0 0 0
c2t0d0 ONLINE 0 0 0
c2t1d0 ONLINE 0 0 0
c2t2d0 ONLINE 0 0 0
errors: No known data errors
bash-3.00# zfs list
NAME USED AVAIL REFER MOUNTPOINT
sata 145K 825G 49K /sata
bash-3.00# zpool destroy -f sata
bash-3.00# zpool create sata mirror c2t0d0 c2t1d0
bash-3.00# zpool list
NAME SIZE USED AVAIL CAP HEALTH ALTROOT
sata 278G 52.5K 278G 0% ONLINE -
bash-3.00# zpool status
pool: sata
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
sata ONLINE 0 0 0
mirror ONLINE 0 0 0
c2t0d0 ONLINE 0 0 0
c2t1d0 ONLINE 0 0 0
errors: No known data errors
bash-3.00# zfs list
NAME USED AVAIL REFER MOUNTPOINT
sata 75.5K 274G 24.5K /sata[/b]
--
[b]bash-3.00# cat /tmp/disks.out
format> disk
selecting c2t0d0
Current partition table (original):
Total disk sectors available: 586055949 + 16384 (reserved sectors)
Part Tag Flag First Sector Size Last Sector
0 usr wm 34 279.45GB 586055949
1 unassigned wm 0 0 0
2 unassigned wm 0 0 0
3 unassigned wm 0 0 0
4 unassigned wm 0 0 0
5 unassigned wm 0 0 0
6 unassigned wm 0 0 0
8 reserved wm 586055950 8.00MB 586072333
format> disk
selecting c2t1d0
Current partition table (original):
Total disk sectors available: 586055949 + 16384 (reserved sectors)
Part Tag Flag First Sector Size Last Sector
0 usr wm 34 279.45GB 586055949
1 unassigned wm 0 0 0
2 unassigned wm 0 0 0
3 unassigned wm 0 0 0
4 unassigned wm 0 0 0
5 unassigned wm 0 0 0
6 unassigned wm 0 0 0
8 reserved wm 586055950 8.00MB 586072333
format> disk
selecting c2t2d0
Current partition table (original):
Total disk sectors available: 586055949 + 16384 (reserved sectors)
Part Tag Flag First Sector Size Last Sector
0 usr wm 34 279.45GB 586055949
1 unassigned wm 0 0 0
2 unassigned wm 0 0 0
3 unassigned wm 0 0 0
4 unassigned wm 0 0 0
5 unassigned wm 0 0 0
6 unassigned wm 0 0 0
8 reserved wm 586055950 8.00MB 586072333
[/b]
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