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Thread: Moving postgres to FC disks

Moving postgres to FC disks

From
"Anjan Dave"
Date:

I am planning to move the pg databases from the internal RAID to external Fiber Channel over SAN.

 

Question is –

 

-With the db size being as big as, say, 30+GB, how do I move it on the new logical drive? (stop postgresql, and simply move it over somehow and make a link?)

-Currently, the internal RAID volume is ext3 filesystem. Any recommendations for the filesystem on the new FC volume? Rieserfs?

 

DBs are 7.4.1(RH9), and 7.2.3 (RH8).

 

 

Appreciate any pointers.

 

Thanks,
Anjan

Re: Moving postgres to FC disks

From
"Joshua D. Drake"
Date:

-With the db size being as big as, say, 30+GB, how do I move it on the new logical drive? (stop postgresql, and simply move it over somehow and make a link?)

I would stop the database, move the data directory to the new volume using rsync then start up postgresql pointed at the new data directory.
Providing everything is working correctly you can then remove the old data directory.

-Currently, the internal RAID volume is ext3 filesystem. Any recommendations for the filesystem on the new FC volume? Rieserfs?

 

XFS

DBs are 7.4.1(RH9), and 7.2.3 (RH8).

 

 

Appreciate any pointers.

 

Thanks,
Anjan



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Re: Moving postgres to FC disks

From
"Aaron Werman"
Date:
I agree on not linking and adding non-SAN disk dependancy to your DB. I'm trying to understand your FS reasoning. I have never seen XFS run faster than ReiserFS in any situation (or for that matter beat any FS in performance except JFS). XFS has some nifty very large file features, but we're talking about 30G and all modern FSs support >2G files.
 
My tendancy would be to stay on ext3, since it is the default RH FS. I would review site preference and the SAN recommended FS and see if they add any compelling points.
 
/Aaron
----- Original Message -----
Sent: Tuesday, April 20, 2004 8:27 PM
Subject: Re: [PERFORM] Moving postgres to FC disks


-With the db size being as big as, say, 30+GB, how do I move it on the new logical drive? (stop postgresql, and simply move it over somehow and make a link?)

I would stop the database, move the data directory to the new volume using rsync then start up postgresql pointed at the new data directory.
Providing everything is working correctly you can then remove the old data directory.

-Currently, the internal RAID volume is ext3 filesystem. Any recommendations for the filesystem on the new FC volume? Rieserfs?

XFS

DBs are 7.4.1(RH9), and 7.2.3 (RH8).

Appreciate any pointers.

Thanks,
Anjan



-- 
Command Prompt, Inc., home of Mammoth PostgreSQL - S/ODBC and S/JDBC
Postgresql support, programming shared hosting and dedicated hosting.
+1-503-667-4564 - jd@commandprompt.com - http://www.commandprompt.com
PostgreSQL Replicator -- production quality replication for PostgreSQL

Re: Moving postgres to FC disks

From
Cott Lang
Date:
On Tue, 2004-04-20 at 17:27, Joshua D. Drake wrote:

> > -Currently, the internal RAID volume is ext3 filesystem. Any
> > recommendations for the filesystem on the new FC volume? Rieserfs?
> >
> >
> XFS

What Linux distributions are popular in here for PG+XFS?

I'm very disappointed that Redhat Enterprise 3 doesn't appear to support
XFS/JFS, or anything else. Suse Server 8 seems very dated, at least from
the eval I downloaded. I'm curious as to where other people have gone
with the death of RH9. I'd have gone on to Redhat 3 if I wasn't
interested in getting some of the benefits of XFS at the same time ...