[lustre-discuss] Advice Lustre & ZFS.

Mark Hahn hahn at mcmaster.ca
Thu Sep 29 07:52:36 PDT 2016

> Isn't hw raid bounds and leagues faster then any software raid that you're
> ever going to be putting in?

certainly not.  choice of hw/sw raid is largely down to taste:
do you want a opaque/proprietary but more hands-off admin workflow,
or do you want direct control of what's happening (failovers, etc).

sw raid has been able to efficiently saturate any reasonable set of disks
for many years.  after all, device-memory IO already goes through the 
processor, and memory bandwidth is "leagues" greater than IO, and Moore
has given us an excess of very fast cores that can each do ~10 GB/s of 
raid6 calculations...

regards, mark hahn.

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