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Best practice for VHS size
Hi, we have a 12 node Isilon cluster with two tiers on OneFS version 8.2.2.0 providing 1.72 PiB of storage. I need some advice on setting the VHS size. At the moment it is set at 10% which means we are reserving 172TiB for rebuilds if we have a failure. Our archive tier consists of A2000 nodes with 4 x 10TB disks in each sled. The 172TiB seems to me to be way too much if I am reserving for disk failures (4 would only be 40TB and likelihood of losing more than 4 disks permanently is extremely small) or not enough if I am reserving for a node failure (which would need 200TB). What do people normally set this at? Is there any rationale for setting it as a percentage of total capacity?
Ian
DELL-Josh Cr
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Posted August 13th, 2020 12:00
Hi Ian,
It depends on your tolerance for losing a node. If losing a node is fine then you probably can reduce the VHS to 5% or 2.5% but if it isn’t you probably should increase it to 200TB.