Re: RAID5

From: Tim Gorman <tim_at_evdbt.com>
Date: Tue, 15 Nov 2011 15:12:58 -0700
Message-ID: <4EC2E3EA.3080005_at_evdbt.com>

There has not been any "breakthrough" in RAID5 technology, and advances in HDD throughput (if any) or caching will improve both RAID5 and RAID10 together.
I've been in meetings where the storage sales rep, when asked about the performance of RAID5 vs RAID10, dismissively waves his hand and snorts, "That's old news", which is true, but doesn't answer the question.

Caveat emptor.

On 11/15/2011 2:54 PM, Karl Arao wrote:
>
> I've encountered a scenario before where the customer allocated
> 5 LUNs for the DATA
> and 4 LUNs for the RECO
> and then I asked him the RAID configuration behind those LUNs.. and he
> told me that the DATA are RAID5, then the RECO are RAID10..
>
> well, I don't want to "argue" which one is better or faster but I let
> our decisions based on facts,numbers,figures
>
> Since we are just on the build stage of the RAC environment.. I
> insisted that we run some benchmarks against the RAID5 and RAID10
> disks and whatever the results of the benchmarks will decide where we
> will place the DATA diskgroup.. luckily he has an open mind..
>
> apparently the RAID10 was 2x faster..
>
> See the results here
> http://karlarao.tiddlyspot.com/#%5B%5BRAID5%20and%20RAID10%20comparison%5D%5D
>
>
>
> --
> Karl Arao
> karlarao.wordpress.com <http://karlarao.wordpress.com>
> karlarao.tiddlyspot.com <http://karlarao.tiddlyspot.com>

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Received on Tue Nov 15 2011 - 16:12:58 CST