Lets not forget despite the fact us lunatic fringe use OpenSolaris on
anything we can get our hands on. Sun Microsystems use Solaris to run
mission critical environments and adding disk in "chunks" like you have
to do in ZFS to a commercial organisation is no big deal. The data is
worth far more to most organisations than the disks. To get the
functionality Sun's customers now have with ZFS for zero dollars (with
the exception of shrinking lets not go down that rat hole), they use to
have to pay many many dollars to Veritas. Or they pay lots of money to
Network Appliance .
For Sun's paying customers to quoute Thomas "the benefits of
ZFS far outweigh the limitations"
Lets not forget: UFS/xVFS SVM/xVM and the whole RAID industry, have
many more years of development and use. ZFS is still the new kid on the
block, he might not be as good as some of the old boys in the
playground, but he is creating a stir and gowning up fast!
Thomas Burgess wrote:
Why not just do simple mirrored vdevs? or use cheaper 1tb
drives for the second vdev?
I don't know....it's up to you...To me the benefits of ZFS far outweigh
the limitations. Also, in my opinion, when you are expanding your
storage, it's a good idea to add it in chunks like this...adding a 4
drive vdev is the way *I* do it right now....though i use 1tb drives
because the 2tb drives aren't worth it atm.
1tb drives are around 80 bucks and 7200 rpm, 2tb drives are 250-300 and
5400 rpm...for the cost of 2 2tb drives you could EASILY add vdevs of
1tb drives...
On Mon, Aug 10, 2009 at 7:03 AM, Chester <no-re...@opensolaris.org>
wrote:
Thanks
for the info so far. Yes, I understand that you can add more vdevs,
but at what cost? With the 2TB drives costing $300 each, I wanted to
get more or less the bare minimum and then add more drives once I
filled the capacity. I understand that raidz1 is similar to RAID5 (it
can recover from a single drive failure) and raidz2 is similar to RAID6
(recovery from up to two drive failures). Since I have four drives
now, I would leave that with single parity and probably the next time I
added a drive, I would migrate over to double parity.
In your scenario, once I fill up my storage capacity, I would need to
add another three drives; therefore dedicating two drives for parity
(one for the four disk set and one for the three disk set), which would
be similar to my plan of moving to double parity. However, what about
after that? Three drives dedicated to single parity for three
different sets? Certainly, I would get to a point where I wouldn't
want 16 drives constantly spinning and I would hope by then either
solid state disks have moved up in storage size and down in terms of
price so I could start cutting over to those.
Is there a way to expand the zpool to take advantage of the increased
size of the hardware once I add a disk on the 3ware controller? I
looked zfsadmin document and see an autoexpand property, but that
feature doesn't appear to be support by OpenSolaris.
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