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Mixed Disk Speeds?

Hi there,

I've been searching around the forum for advice on mixed disk speeds, however I couldn't find anything that addresses my concern. I have a variety of unused hard disks of varying capacity and speed that I would like to use in a test PetaSAN cluster, however I wondered if there was any advice or guidance on this. It would result in a mixed disk speed of 15K and 7.2K disks.

I imagine I'll see slower performance, as data is spanned over the 7.2K disks, but I wondered if there was some specific guidance on this.

Thanks for your help in advance.

Mixing disks will work but for performance, it is always better to use disk of the same size, speed even best to be the same type/make. Slower disks will tend to slow the cluster down, larger disks will get more load so they will also slow things down.

In next version 2.1 you will be able to create separate storage pools, so you can create pools of similar disk speeds, for example have a pool for slow backups and one for fast vm loads each made up of different disk types.

Note the recommendations for PetaSAN is to use all flash ssd/nvme.