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Re: ZFS on current vs wedges - best practice?
Hi Jeff !
Yes, you can use wedge names.
you can configure thm like "zpool create tank raidz2 wedges/wedgename-a
wedges/wedgename-b wedges/wedgename-c wedges/wedgename-d wedges/wedgename-e"
For wedges to work you need to start devpubd (/etc/rc.conf: devpubd=YES)
before ZFS. Currently devpub start too late with its dependencies.
To start devpubd earlier you can use following dependencies in
# PROVIDE: devpubd
# REQUIRE: root
# BEFORE: DISKS
to recover (not tested) you may try:
zpool export tank # you may try without this first
zpool import -d /dev/wedges # list found pools
zpool import -d /dev/wedges -a # imports all found pools
Use the hints at your own risk. I learned those when we briefly
(9.99.85-9.99.86) broke zfs vdev access via symlinks. be sure to use a
recent (>2021-07-18) -current kernel in case you are running -current.
On 07/19/21 19:52, Jeff Rizzo wrote:
I had forgotten about this little detail, and am not sure about the
best way to deal with it.
I have four disks partitioned with GPT (so I can create a raidframe
raid1 on part of the disk, and use the rest for ZFS), and I made the
mistake (?) of using wedge names to create the zpool. So, after a
reboot (but not the first time! only happened after n reboots), the
wedges reordered themselves, and now my zpool looks like this:
NAME STATE READ WRITE CKSUM
tank UNAVAIL 0 0 0
raidz2-0 UNAVAIL 0 0 0
3140223856450238961 UNAVAIL 0 0 0 was /dev/dk4
1770477436286968258 FAULTED 0 0 0 was /dev/dk5
11594062134542531370 UNAVAIL 0 0 0 was /dev/dk6
dk7 ONLINE 0 0 0
I _ think_ I can figure out how to recover my data without recreating
the entire pool. (I hope - suggestions there welcome as well! Once I
recover this time, I'm going to have to replace the vdevs one at a
time anyway because I just realized they wedges are misaligned to the
underlying disk block size. Sigh.)
However, I'm not sure the best way (is there a way?) to keep this from
happening again. Can I use wedge names? (Will those persist across
boots?) Other than this minor detail, I've been quite happy with ZFS
in 9 and -current.
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