On Thursday, June 06, 2013 06:52 AM, Heinrich van Riel wrote:
Any pointers around iSCSI performance focused on read speed? Did not find
much.
I have 2 x rz2 of 10x 3TB NL-SAS each in the pool. The OI server has 4
interfaces configured to the switch in LACP, mtu=9000. The switch (jumbo
enabled) shows all interfaces are active in the port channel. How can I can
verify it on the OI side? dladm shows that it is active mode
The Hyper-v systems has 2 interfaces in LACP and all show as active and
windows indicate 2Gbps, never go over 54% util.
When I copy to an iSCSI disk from a local disk, it copies at around 200MB/s
and thats fine. When I copy from the iSCSI disk to the local disk I get no
more that 80-90MB/s and that is after messing around with the TCP/IP
setting on Windows. Before the changes it was 47MB/s max. (copy from the
local disk to the local disk I get 107MB/s so that is not the issue)
VMware 5.0 will not get more than that either.
I may be wrong but I don't think a single connection will be split over
two interfaces in LACP to achieve higher throughput. If you have
concurrent connections then perhaps you may see more throughput.
Even when I do a zfs send/recv is seems that reads are slower. I assume
this is the expected behavior.
zfs has to seek all over the place to find the snapshots which slows
things down.
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