On Jun 26, 2006, at 1:15 AM, Mika Borner wrote:
Hi
Now that Solaris 10 06/06 is finally downloadable I have some
questions
about ZFS.
-We have a big storage sytem supporting RAID5 and RAID1. At the
moment,
we only use RAID5 (for non-solaris systems as well). We are thinking
about using ZFS on those LUNs instead of UFS. As ZFS on Hardware RAID5
seems like overkill, an option would be to use RAID1 with RAID-Z. Then
again, this is a waist of space, as it needs more disks, due to the
mirroring. Later on, we might be using asynchronous replication to
another storage system using SAN, even more waste of space. This looks
somehow like storage virtualization as of today just doesn't work
nicely
together. What we need, would be the feature to use JBODs.
If you've got hardware raid-5, why not just run regular (non-raid)
pools on top of the raid-5?
I wouldn't go back to JBOD. Hardware arrays offer a number of
advantages to JBOD:
- disk microcode management
- optimized access to storage
- large write caches
- RAID computation can be done in specialized hardware
- SAN-based hardware products allow sharing of storage among
multiple hosts. This allows storage to be utilized more effectively.
-Does ZFS in the current version support LUN extension? With UFS, we
have to zero the VTOC, and then adjust the new disk geometry. How does
it look like with ZFS?
I don't understand what you're asking. What problem is solved by
zeroing the vtoc?
-I've read the threads about zfs and databases. Still I'm not 100%
convenienced about read performance. Doesn't the fragmentation of the
large database files (because of the concept of COW) impact
read-performance?
This is discussed elsewhere in the zfs discussion group.
-Does anybody have any experience in database cloning using the ZFS
mechanism? What factors influence the performance, when running the
cloned database in parallel?
-I really like the idea to keep all needed databasefiles together, to
allow fast and consistent cloning.
Thanks
Mika
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