On 16/05/16 10:28, Sanchez, Paul wrote:
Simon,
I can’t speak specifically to the FS-900, since I generally use Dell
Compellent and NetApp EF arrays for flash today. But I also take care
to ensure that the system pool metadata NSDs use RAID10 (or equivalent)
rather than RAID5/6. For small 4K metadata writes, on a 4K blocksize
LUN this could result in optimal writes. For larger native blocksize
LUNs, it eliminates the parity calculation for read-modify-write
operations.
General point would it not make more sense to make multiple RAID1's and
set replication of the metadata than make a RAID10? Preferably with the
RAID1's on more than one storage array?
Always gives me a warm fuzzy feeling to have my metadata replicated even
if the data is not.
JAB.
--
Jonathan A. Buzzard Email: jonathan (at) buzzard.me.uk
Fife, United Kingdom.
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