Eric Haycraft wrote:
Since no one seems to believe that you can expand a raidz pool, I have attached the following output from solaris 11/06 showing me doing just that. The first expanision is with like sized disks, and the second expansion is with larger disks. I realize that the documentation only has examples using mirrors, but raidz and raid2z are fully supported for adding disk space.
# mkfile 64m 1 2 3 4 5 6
# mkfile 128m 01 02 03
# zpool create testpool raidz `pwd`/1 `pwd`/2 `pwd`/3
# zpool list testpool
NAME SIZE USED AVAIL CAP HEALTH ALTROOT
testpool 178M 100K 178M 0% ONLINE -
# zpool add testpool raidz `pwd`/4 `pwd`/5 `pwd`/6
# zpool list testpool
NAME SIZE USED AVAIL CAP HEALTH ALTROOT
testpool 356M 305K 356M 0% ONLINE -
# zpool add testpool raidz `pwd`/01 `pwd`/02 `pwd`/03
# zpool list testpool
NAME SIZE USED AVAIL CAP HEALTH ALTROOT
testpool 726M 475K 726M 0% ONLINE -
#
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No, you are NOT adding to a RAIDZ vdev. You are adding to a ZPOOL.
Your new pool has 2 stripes of RAIDZ vdevs.
The final "testpool" zpool above consists of 3 RAIDZ vdevs, each with 3
members.
While expanding a zpool in the way you've show is useful, it has nowhere
near the flexibility of simply adding single disks to existing RAIDZ
vdevs, which was the original desire expressed. This conversation has
been had several times now (take a look in the archives around Jan for
the last time it came up).
To make myself clear, what we're talking about is some way to move from:
zpool create tank raidz d1 d2 d3
to the equivalent of
zpool create tank raidz d1 d2 d3 d4 d5 d6
in increments. Right now, that's not possible.
Also, I believe there is a bug in zfs list for Solaris 10 U3's zfs - I
have to check it out. Because:
# cd /tmp
# mkfile 64m 1 2 3 4 5 6 7 8
# zpool create testpool1 raidz /tmp/1 /tmp/2 /tmp/3 /tmp/4 raidz /tmp/5
/tmp/6 /tmp/7 /tmp/8
# zfs list testpool1
NAME USED AVAIL REFER MOUNTPOINT
testpool1 131K 444M 49K /testpool1
# zpool destroy testpool1
# zpool create testpool2 raidz /tmp/1 /tmp/2 /tmp/3 /tmp/4 /tmp/5 /tmp/6
/tmp/7 /tmp/8
# zfs list testpool2
NAME USED AVAIL REFER MOUNTPOINT
testpool2 77K 444M 3K /testpool2
Which is _clearly_ incorrect. "testpool1" should have a size of
approximately 6*64m = 384, not 7*64m = 448m as in "testpool2".
--
Erik Trimble
Java System Support
Mailstop: usca22-123
Phone: x17195
Santa Clara, CA
Timezone: US/Pacific (GMT-0800)
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