Kragen Sitaker wrote:
On Tue, Apr 27, 2004 at 10:36:24AM +0700, David Garamond wrote:
Glen Parker wrote:
Sounds an aweful lot like RAID level one :-) Why would a DB system need to
do what RAID already does quite well?
I think IB/FB's shadowing was implemented before RAID was invented
Heh, not
On Mon, 2004-04-26 at 23:43, Bruce Momjian wrote:
David Garamond wrote:
Now suppose /disk1 fails, one of the shadow can be configured to
immediately take over as the master database, without any down time. We
can then add /disk4/dbname.fdb, for instance, to become a new shadow.
Robert Treat wrote:
On Mon, 2004-04-26 at 23:43, Bruce Momjian wrote:
David Garamond wrote:
Now suppose /disk1 fails, one of the shadow can be configured to
immediately take over as the master database, without any down time. We
can then add /disk4/dbname.fdb, for instance, to become
At 09:53 AM 4/27/2004 -0400, Bruce Momjian wrote:
Actually, what is needed is:
- an exact mirror at all times;
- a very simple, straightforward, and fast way to failover;
done by software.
They can do hardware mirroring, or software/OS mirroring. Why put that
in the database
On 4/26/04 3:25 PM, Glen Parker [EMAIL PROTECTED] wrote:
Sounds an aweful lot like RAID level one :-) Why would a DB system need to
do what RAID already does quite well?
One case I can think of is where the shadow is on a separate system (e.g. a
SAN or NetApps, another linux box, etc.). RAID
David Garamond wrote:
Actually, what is needed is:
- an exact mirror at all times;
- a very simple, straightforward, and fast way to failover;
done by software.
http://www.drbd.org/ works well for us and can be set up quickly and
from commodity parts.
---(end of
[EMAIL PROTECTED] wrote:
died it caused corruption elsewhere. I have also seen (a couple of times) a
controller go bad and proceed to write garbage all over the disks. The
mirroring worked quite well - we had a very nice file system full of
mirrored garbage.
Does this mean software RAID is
On 4/27/04 11:48 PM, David Garamond [EMAIL PROTECTED] wrote:
Does this mean software RAID is actually safer than hardware RAID?
(Since the OS and processor is usually more reliable than a disc
controller).
I'm not sure I would jump to that conclusion. If a controller went bad and
trashed a
David Garamond wrote:
Bruce Momjian wrote:
David Garamond wrote:
Is there a feature similar to this currently in Postgres, or will there
be? Sometimes (like in a shared hosting environment), we cannot have the
luxury of hot-swapped RAID or expensive SAN, and it's nice to be able to
Bruce Momjian wrote:
David Garamond wrote:
Is there a feature similar to this currently in Postgres, or will there
be? Sometimes (like in a shared hosting environment), we cannot have the
luxury of hot-swapped RAID or expensive SAN, and it's nice to be able to
have a synchronous backup so that
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