Kimberly Chang wrote:
A couple of ZFS questions:
1. ZFS dynamic striping will automatically use new added devices when
there are write requests. Customer has a *mostly read-only* application
with I/O bottleneck, they wonder if there is a ZFS command or mechanism
to enable the manual rebalancing of ZFS data when adding new drives to
an existing pool?
cp :-)
If you copy the file then the new writes will be spread across the newly
added drives. It doesn't really matter how you do the copy, though.
2. Will ZFS automatically/proactively seek out bad blocks (self-healing)
when there're idle cpu cycles? I don't think so but like to get a
confirmation. We are aware of 'zpool scrub', a manual way to verify
checksums and correct bad blocks. We also know that bad blocks will be
self-healed when there's a access request to the bad block.
You can setup periodic scrubs with cron (I'm unsure if there is also a
builtin timer -- to do so wouldn't be very UNIX-like)
The ZFS scheduler put scrubs at a low priority, so they should have
minimal impact on real work.
3. Can zpool determine and alert if server2 is attemping to import a ZFS
pool that is currently imported by server1? Can server2 force an import
in case server1 crashes - manual failover scenario?
The manual failover scenario is also how the automated failover scenario
will work with Sun Cluster. However, I do not believe there is a way
for server1 to know that server2 is *attempting* the import without a
cluster infrastructure. Normally, for Sun Cluster, the disks will be fenced
from the other node.
4. When S10 ZFS boot is available, will Sun offer a migration strategy
(commands, processes, etc.) to convert/migrate root devices from
SVM/VxVM to a ZFS root file system?
cp :-)
cpio more likely, but it may be easier to use LiveUpgrade or reinstall,
depending on how the legacy system is configured.
Conversion in-place is just not worth the effort.
-- richard
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