| From: | Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com> |
|---|---|
| To: | Brent Wood <Brent(dot)Wood(at)niwa(dot)co(dot)nz> |
| Cc: | David Rees <drees76(at)gmail(dot)com>, PostgreSQL General <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: SSD Drives |
| Date: | 2014-04-03 22:22:08 |
| Message-ID: | CAOR=d=1qTEx-sE2wjXX4KObEq3CCmNOENn5NFHJjPkRZvpQ9fw@mail.gmail.com |
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| Lists: | pgsql-general |
On Thu, Apr 3, 2014 at 1:44 PM, Brent Wood <Brent(dot)Wood(at)niwa(dot)co(dot)nz> wrote:
>
> Hi David,
>
> Does the RAID 1 array give any performance benefits over a single drive? I'd guess that writes may be slower, reads may be faster (if balanced) but data security is improved.
I did some testing on machines with 3xMLC FusionIO Drive2s with 1.2TB.
Comparing 1 drive and 2 drives in RAID-1 the difference in performance
was minimal. However, a 3 drive mirror was noticeably slower. This was
all with ubuntu 12.04 using 3.8.latest kernel and software RAID.
RAID-0 was by far the fastest, about 30% faster than either a single
or a pair of drives in RAID-1
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