I have a snv_52 server that I want to upgrade to the latest, either via a
non-debug build or a simple fresh install. I don't know which yet as I
have not decided.
I have a pile of disks hanging off it on two controllers, c0 and c1.
The disks on c1 are in a zpool thus :
bash-3.1$ zpool status
pool: zfs0
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
zfs0 ONLINE 0 0 0
c1t9d0 ONLINE 0 0 0
c1t10d0 ONLINE 0 0 0
c1t11d0 ONLINE 0 0 0
c1t12d0 ONLINE 0 0 0
c1t13d0 ONLINE 0 0 0
c1t14d0 ONLINE 0 0 0
errors: No known data errors
bash-3.1$ zpool iostat -v zfs0 15 4
capacity operations bandwidth
pool used avail read write read write
---------- ----- ----- ----- ----- ----- -----
zfs0 182G 20.7G 0 19 14.7K 1.65M
c1t9d0 30.3G 3.46G 0 3 2.44K 281K
c1t10d0 30.3G 3.46G 0 3 2.47K 281K
c1t11d0 30.3G 3.46G 0 3 2.43K 281K
c1t12d0 30.3G 3.46G 0 3 2.45K 280K
c1t13d0 30.3G 3.46G 0 3 2.49K 281K
c1t14d0 30.3G 3.46G 0 3 2.43K 281K
---------- ----- ----- ----- ----- ----- -----
capacity operations bandwidth
pool used avail read write read write
---------- ----- ----- ----- ----- ----- -----
zfs0 182G 20.6G 0 97 63.9K 10.4M
c1t9d0 30.3G 3.44G 0 13 0 1.71M
c1t10d0 30.3G 3.44G 0 13 8.52K 1.71M
c1t11d0 30.3G 3.44G 0 14 8.52K 1.73M
c1t12d0 30.3G 3.44G 0 19 12.8K 1.74M
c1t13d0 30.3G 3.44G 0 19 25.6K 1.74M
c1t14d0 30.3G 3.44G 0 16 8.52K 1.74M
---------- ----- ----- ----- ----- ----- -----
capacity operations bandwidth
pool used avail read write read write
---------- ----- ----- ----- ----- ----- -----
zfs0 182G 20.4G 1 120 85.5K 11.7M
c1t9d0 30.3G 3.41G 0 17 13.0K 1.95M
c1t10d0 30.3G 3.41G 0 18 21.3K 1.97M
c1t11d0 30.3G 3.41G 0 23 21.3K 1.96M
c1t12d0 30.3G 3.41G 0 21 12.8K 1.95M
c1t13d0 30.3G 3.41G 0 21 12.8K 1.97M
c1t14d0 30.3G 3.40G 0 18 4.26K 1.94M
---------- ----- ----- ----- ----- ----- -----
capacity operations bandwidth
pool used avail read write read write
---------- ----- ----- ----- ----- ----- -----
zfs0 182G 20.3G 0 110 38.4K 10.4M
c1t9d0 30.4G 3.38G 0 18 12.8K 1.74M
c1t10d0 30.4G 3.38G 0 17 4.26K 1.75M
c1t11d0 30.4G 3.38G 0 18 0 1.74M
c1t12d0 30.4G 3.38G 0 17 8.53K 1.71M
c1t13d0 30.4G 3.38G 0 18 0 1.70M
c1t14d0 30.4G 3.38G 0 20 12.8K 1.77M
---------- ----- ----- ----- ----- ----- -----
bash-3.1$ uname -a
SunOS mars 5.11 snv_52 sun4u sparc SUNW,Ultra-2
Note the complete lack of redundency !
Now then, I have a collection of six disks on controller c0 that I would
like to now mirror with this ZPool zfs0. Thats the wrong way of thinking
really. In the SVM world I would create stripes and then mirror them to get
either RAID 0+1 or RAID 1+0 depending on various factors. With ZFS I am
more likely to just create the mirrors on day one thus :
# zpool create zfs0 mirror c1t9d0 c0t9d0 mirror c1t10d0 c0t10d0 ... etc
but I don't have that option now. The zpool exists as a simple stripe set
at the moment. Or some similar analogy of a stripe set in the ZFS world.
Now zpool(1M) says the following for either "add" or "attach" :
SunOS 5.10 Last change: 31 Jul 2006 6
System Administration Commands zpool(1M)
zpool add [-fn] pool vdev ...
Adds the specified virtual devices to the given pool.
The vdev specification is described in the "Virtual Dev-
ices" section. The behavior of the -f option, and the
device checks performed are described in the "zpool
create" subcommand.
-f Forces use of vdevs, even if they appear in use
or specify a conflicting replication level. Not
all devices can be overridden in this manner.
-n Displays the configuration that would be used
without actually adding the vdevs. The actual
pool creation can still fail due to insuffi-
cient privileges or device sharing.
zpool attach [-f] pool device new_device
Attaches new_device to an existing zpool device. The
existing device cannot be part of a raidz configuration.
If device is not currently part of a mirrored configura-
tion, device automatically transforms into a two-way
mirror of device and new_device. If device is part of a
two-way mirror, attaching new_device creates a three-way
mirror, and so on. In either case, new_device begins to
resilver immediately.
-f Forces use of new_device, even if its appears
to be in use. Not all devices can be overridden
in this manner.
Note that "attach" has no option for -n which would just show me the damage
I am about to do :-(
So I am making a best guess here that what I need is something like this :
# zpool attach zfs0 c1t9d0 c0t9d0
which would mean that the fist disk in my zpool would be mirrored and
nothing else. A weird config to be sure but .. is this what will happen?
I ask all this in painful boring detail because I have no way to backup this
zpool other than tar to a DLT. The last thing I want to do is destroy my
data when I am trying to add redundency.
Any thoughts ?
--
Dennis Clarke
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