On Fri, Oct 1, 2010 at 9:31 PM, John Hutchison <email@hidden> wrote:
> On Oct 1, 2010, at 2:22 PM, Ian Flemming wrote:
>
>> I'm curious if it would provide any noticeable performance improvement
>> to use 4 disks in RAID 10 configuration. We have some extra disks in
>> one Promise unit, so it's no big deal to use them. Any thoughts on
>> this from the experts?
>
> Depending on the sorts of files going into your volume and what it's tuned for (video, file server etc...)
> you can definitely improve performance by creating two RAID1 metadata LUNS across four disks.
> I have observed that in practice. Can't speak for RAID10.
Hi John,
Thanks for your input on this. Can you explain what you mean by two
RAID1 LUNs over four disks? I only need one metadata LUN, but I'm
trying to figure out whether the access time would be reduced by
striping two RAID1 LUNs together to form a single RAID 10 (0+1) LUN.
I've used this configuration for other applications (like internal Mac
Pro RAID) because it doubles r/w speed over a two disk mirror.
Cheers,
Ian
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