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Forum Discussion
ReadyNAS 4220 iSCSI performance w/ VMWare... #23771040
Is there a tuning guide for using ReadyNAS 4220 w/ 10GbE and VMWare ESX 5? Also what would an average transfer rate be when using 10GbE and iSCSI? Here is my current setup: Juniper EX4550 Read...
For the sake of completeness, I migrated all data over to a thick provisioned LUN. I'm averaging around 450MB/s write speeds. However after several consecutive runs, the disk latency caused a 75% drop in throughput and started spiking disk latency warnings in the vCenter console.
After some searching/tweaking, it was suggested that when using "Round-Robin" multi-pathing (dual paths) in VMWare that the IOPS setting on the device be dropped from a default of 2000 to 1. This helped a fair amount and showed an increase in the data transfer over both iSCSI paths to the NAS and only a drop of about 40% on back-to-back runs.
I am working on getting a UPS for it to get a bit more out of it.
What I don't know is whether 450MB/s write speeds is what I should be expecting over dual 10GbE interfaces on the ReadyNAS 4220.
Are there any memory or RAID controller upgrades that might help in the future? Any other tips? I know on a physical server that a battery-backed write cache can do wonders. Curious what the configuration is on the 4220.
After some searching/tweaking, it was suggested that when using "Round-Robin" multi-pathing (dual paths) in VMWare that the IOPS setting on the device be dropped from a default of 2000 to 1. This helped a fair amount and showed an increase in the data transfer over both iSCSI paths to the NAS and only a drop of about 40% on back-to-back runs.
I am working on getting a UPS for it to get a bit more out of it.
What I don't know is whether 450MB/s write speeds is what I should be expecting over dual 10GbE interfaces on the ReadyNAS 4220.
Are there any memory or RAID controller upgrades that might help in the future? Any other tips? I know on a physical server that a battery-backed write cache can do wonders. Curious what the configuration is on the 4220.
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