Thanks
Now, I don't have any worry to migrate to ZFS.
I have 3 drives.
The first one will be the primary/boot drive under
UFS. The 2 others will become a mirrored pool with
ZFS.
Now, I have problem with the boot drive (hardware
or software), so all the data on my mirrored pool are
ok?
How can I restore this pool? When I create the
pool, do I need to save the properties?
All metadata for the pool is stored inside the pool.
If the boot disk fails in
any way, all pool data is safe.
Worst case might be that you have to reinstall
everything on the boot disk.
After that, you just say zfs import to get your
pool back and everything
will be ok.
What happend when a drive crash when ZFS write some
data on a raidz pool?
If the crash occurs in the middle of a write
operation, then the new data
blocks will not be valid. ZFS will then revert back
to the state before
writing the new set of blocks. Therefore you'll have
100% data integrity
but of course the new blocks that were written to the
pool will be lost.
Do the pool go to the degraded state or faulted
state?
No, the pool will come up as online. The degraded
state is only for devices
that aren't accessible any more and the faulted state
is for pools that do
not have enough valid devices to be complete.
Hope this helps,
Constantin
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