El 19/07/17 a las 08:41, Dietmar Maurer escribió:
So I cannot figure out why LVM-over-iSCSI is so slow.
I guess your benchmark is simply wrong. You are testing the
local cache, because you do not sync the data back to the storage.
Really, 2.7GB/s for 4x4TB disks in RAID10 seems totally unreasonable (I
guess they're not SSD drives...)
I think that in the best conditions that could give about 200-250MB/s
max, totally sequential writes, etc.
Don't know why iSCSI is so slow, have you checked CPU usage on both sides?
Anyhow your test copy is too small, use a file that at least is double
the available RAM on storage server, or otherwise force sync.
Cheers
Eneko
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Zuzendari Teknikoa / Director Técnico
Binovo IT Human Project, S.L.
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