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20838
June 12th, 2013 09:00
Very degraded performance on random writes with SyncRep enabled
I have two PS4000X SANs in a SAN group and am doing some testing with Iometer and am finding that performance is going from 100-120MB/S random writes to 5-10MB/S if I turn on SyncRep. These two sans are connected to a Cisco 2248TP switch on a dedicated vlan. I have the management ports set to a different subnet.
Are there areas I should look at to try to troubleshoot this or is that an expected write speed with this equipment in SyncRep mode? Sequential writes take a hit from 100-120MB/S to 50-60MB/S which seems more in line with expectations.
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blinko1
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June 12th, 2013 13:00
Also can you suggest an appropriate switch family to look at from Cisco? We are running a 3 host environment and were hoping to use synchronous rep between two sites but asynchronous may be fine as well.
blinko1
3 Posts
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June 12th, 2013 13:00
I would expect to see this same issue in a multisite situation then no? I was doing a test run in the same rack but the connection between the two sites is fiber between two nexus so it seems like I can not expect the performance to change with the current network hardware?