On Jan 6, 2010, at 1:30 PM, Wes Felter wrote:
Michael Herf wrote:
I agree that RAID-DP is much more scalable for reads than RAIDZx, and
this basically turns into a cost concern at scale.
The raw cost/GB for ZFS is much lower, so even a 3-way mirror could
be
used instead of netapp. But this certainly reduces the cost advantage
significantly.
Has anyone compared RAID-Z2 against something like LSI MegaRAID
RAID-6? If a sub-$1,000 RAID controller can save thousands of
dollars worth of disks it would somewhat put the lie to the idea
that ZFS kills hardware RAID.
ZFS doesn't kill "hardware RAID." First, there is no such thing as
"hardware RAID"
there is only software RAID. Second, "hardware RAID" systems are
pretty much
useless without a file system, database, or some other application
which can
translate from a set of blocks to something useful. Rather, ZFS works
very nicely
with "hardware RAID" systems or JBODs, iSCSI, et.al. You can happily
add the
advantage of ZFS features using a LSI MegaRAID RAID-6 controller at
little
or no additional cost :-)
-- richard
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