VMWare ESXi Datastore latency - acceptible levels
Posted on 2014-02-12
I know this is a grey area as there is usually more involved to it.
We have a HP BL460 G1 with 4x 1TB 7,200 SAS Drives in RAID 1+0 (512MB BBWC at 50/50% read/write sharing) at present but may need to push it up to RAID 5 for the extra storage.
Currently the datastore latency is as follows:
Write Latency: Maximum 8ms, average 1.1ms
Read latency: Maximum 40ms, average 6.5ms
The I/O's on the server aren't that high, but what could I expect if I changed from RAID 1+0 to RAID 5? I'm assuming +25% increase in maximum latency - would that sound close enough?