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September 13th, 2017 02:00
RAID configuration for ESXi VMFS6 data store
Hi,
I have 4 x SSD SAS drives locally installed in my R730 server and I am using a PERC H730P Mini RAID controller. I am creating a RAID 6 virtual disk (ESXi 6.5 U1) and my question is on the optimal configuration for a ESXi VMFS 6 volume. From my research, I believe it is best practice to configure:
write policy: write back
read policy: adaptive read ahead
cache policy: default
What I am unsure about is the block and stripe sizes. The defaults are:
block size: 512 bytes
stripe size: 64k
I understand that the block sizes need to be aligned in multiples of 4k. I do read in quite a few sources that suggest to change the default block size to 1024kb to match the block size of VMFS6? I would like to confirm that this is best practice? And in terms of the stripe size, should I leave it at the default? Any other recommendations?
Thank you!
DELL-Josh Cr
Community Manager
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September 13th, 2017 10:00
Hi,
For stripe size it typically depends on the file sizes, smaller files benefit from smaller stripe sizes and larger files from larger ones, but the best way is to test a few different ones for your environment and compare. For the block size we do not have a recommended settings between 512 or 1024.