Re: Deploying PostgreSQL on CentOS with SSD and Hardware RAID

I'd expect to use a RAID controller with either BBU or NVRAM cache to
handle that, and that the server itself would be on UPS for a production
DB. That said, a standby replica DB on conventional disk is definitely a
good idea in any case.

On Fri, May 10, 2013 at 12:25 PM, Merlin Moncure <mmoncure(at)gmail(dot)com> wrote:

> On Fri, May 10, 2013 at 11:11 AM, Evan D. Hoffman
> <evandhoffman(at)gmail(dot)com> wrote:
> > Not sure of your space requirements, but I'd think a RAID 10 of 8x or
> more
> > Samsung 840 Pro 256/512 GB would be the best value. Using a simple
> mirror
> > won't get you the reliability that you want since heavy writing will burn
> > the drives out over time, and if you're writing the exact same content to
> > both drives, they could likely fail at the same time. Regardless of the
> > underlying hardware you should still follow best practices for
> provisioning
> > disks, and raid 10 is the way to go. I don't know what your budget is
> > though. Anyway, mirrored SSD will probably work fine, but I'd avoid
> using
> > just two drives for the reasons above. I'd suggest at least testing
> RAID 5
> > or something else to spread the load around. Personally, I think the
> ideal
> > configuration would be a RAID 10 of at least 8 disks plus 1 hot spare.
> The
> > Samsung 840 Pro 256 GB are frequently $200 on sale at Newegg. YMMV but
> they
> > are amazing drives.
>
> Samsung 840 has no power loss protection and is therefore useless for
> database use IMO unless you don't care about data safety and/or are
> implementing redundancy via some other method (say, by synchronous
> replication).
>
> merlin
>