[Info-vax] RAID vs. MOUNT/BIND

[Rob Brown]

On Tue, 23 Nov 2010 at 09:15 -0800, Keith Lewis wrote:

> ... RAID 5 should theoretically give you both performance and 
> redundancy.

RAID 5 gives redundancy, no argument there.

RAID 5 gives good read performance, but its write performance is not 
as good.  Each logical write becomes 4 I/O: 2 reads and 2 writes.

If all of the extra I/O is hidden in hardware with deep caches, then 
it may not be noticeable.  Or if you don't do so many writes, you may 
not be bothered by poor write performance.

Or at least, that is the way it seems to me.

PS:  *Is* there a host-based RAID (other than 1 and 0) for VMS?


-- 

Rob Brown                        b r o w n a t g m c l d o t c o m
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