[lustre-discuss] Advice Lustre & ZFS.

William Hay w.hay at ucl.ac.uk
Thu Sep 29 08:02:18 PDT 2016

On Thu, Sep 29, 2016 at 05:34:30PM +0300, E.S. Rosenberg wrote:
>    Isn't hw raid bounds and leagues faster then any software raid that you're
>    ever going to be putting in?
Why would it be?  The bottleneck (even with SSDs) is going to be the disks.  AIUI with traditional 
RAID5/6 the presence of a battery backed cache allows hardware RAID to maintain consistency 
guarantees without additional disk accesses needed by a software implementation but ZFS/
RAID-Z is designed to avoid the need for such a cache.

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