| From: | Scott Marlowe <smarlowe(at)g2switchworks(dot)com> |
|---|---|
| To: | Tom Arthurs <tarthurs(at)jobflash(dot)com> |
| Cc: | erik(dot)myllymaki(at)aviawest(dot)com, Mark Lewis <mark(dot)lewis(at)mir3(dot)com>, Vivek Khera <vivek(at)khera(dot)org>, Pgsql performance <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: hardare config question |
| Date: | 2006-05-01 18:51:55 |
| Message-ID: | 1146509515.22037.26.camel@state.g2switchworks.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
On Mon, 2006-05-01 at 13:22, Tom Arthurs wrote:
> UPS does not protect against the tech behind the rack unplugging the
> power cable, or an accidental power cycle from exercising the wrong
> switch. :) Both are probably more common causes of failure than a total
> power outage.
>
> Erik Myllymaki wrote:
> > I have been in discussion with 3ware support and after adjusting some
> > settings, the 3ware card in RAID 1 gets better performance than the
> > single drive. I guess this had everything to do with the write (and
> > maybe read?) cache.
> >
> > Of course now i am in a dangerous situation - using volatile write
> > cache without a BBU.
> >
> > If I were to use a UPS to ensure a soft shutdown in the event of power
> > loss, am I somewhat as safe as if I were to purchase a BBU for this
> > RAID card?
Nor does it prevent an electrician from dropping a tiny piece of wire
into a power conditioner, causing a feedback that blows the other two
power conditioners, all three industrial UPSes, and the switch that
allows the Diesal generator to take over.
When that happened to me, I had the only database server in the company
to come back up 100% in tact. You can guess by now I also had the only
database server with battery backed cache...
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