On Sep 29, 2009, at 7:59 AM, Bernd Nies wrote:
Hi,
The system already has a SSD (ATASTECZeusIOPS018GBytesSTM0000D905C)
as ZFS log device.
I apologize, I should know better than to answer before the first cup of
coffee :-P
NFS writes from only one host are not the problem. Even with may
small files it is almost as fast as a Netapp. Problem arises when
doing the same parallel from n hosts. E.g. the same write from 10
hosts lasts 10 times longer. On the Netapp the same from 10 hosts
takes only 2-3 times longer. Network bandwith is also not the
problem here.
We would need more info before we could proceed. Can you collect
some iostat data?
iostat -zxnT d 1
The "raidz acts like a single disk" for IOPS is felt on small, random
read
workloads. Random write workloads perform better.
-- richard
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