Jens Elkner wrote:
Currently I'm trying to figure out the best zfs layout for a thumper wrt. to read AND write performance.
First things first. What is the expected workload? Random, sequential, lots of
little files, few big files, 1 Byte iops, synchronous data, constantly changing
access times, ???
In general, striped mirror is the best bet for good performance with redundancy.
I did some simple mkfile 512G tests and found out, that per average ~ 500 MB/s
seems to be the maximum on can reach (tried initial default setup, all 46 HDDs
as R0, etc.).
How many threads? One mkfile thread may be CPU bound.
-- richard
According to
http://www.amd.com/us-en/assets/content_type/DownloadableAssets/ArchitectureWP_062806.pdf
I would assume, that much more and at least in theory a max. ~ 2.5 GB/s should
be possible with R0 (assuming the throughput for a single thumper HDD is ~ 54
MB/s)...
Is somebody able to enlighten me?
Thanx,
jel.
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