| From: | Magnus Hagander <magnus(at)hagander(dot)net> |
|---|---|
| To: | Hannes Dorbath <light(at)theendofthetunnel(dot)de> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-general(at)postgresql(dot)org, drbd-user(at)lists(dot)linbit(dot)com |
| Subject: | Re: PostgreSQL clustering (shared disk) |
| Date: | 2007-08-17 14:45:39 |
| Message-ID: | 20070817144539.GE13741@svr2.hagander.net |
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| Lists: | pgsql-general |
On Fri, Aug 17, 2007 at 04:19:57PM +0200, Hannes Dorbath wrote:
> On 17.08.2007 15:59, Tom Lane wrote:
> >On the other side of the coin, I have little confidence in DRBD
> >providing the storage semantics we need (in particular guaranteeing
> >write ordering). So that path doesn't sound exactly risk-free either.
>
> To my understanding DRBD provides this. I think a discussion about that
> with the DRBD developers would be very useful for many users searching
> for a solution to replicate PostgreSQL, so I'm cross posting this to
> DRBD list. Maybe you can make clear in detail what requirements
> PostgreSQL has.
It does, AFAIK, if yuo configure it properly. I think it's the "protocol"
parameter you need to set to C which is the slowest, but it's the only one
that waits for the block to hit *both* disks.
//Magnus
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