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Re: 32-bit to 64-bit migration options

From: Guillaume Lelarge <guillaume(at)lelarge(dot)info>
To: Greg Spiegelberg <gspiegelberg(at)gmail(dot)com>
Cc: "[ADMIN]" <pgsql-admin(at)postgresql(dot)org>
Subject: Re: 32-bit to 64-bit migration options
Date: 2012-02-10 15:14:06
Message-ID: 1328886846.2155.39.camel@localhost.localdomain (view raw or flat)
Thread:
Lists: pgsql-admin
On Fri, 2012-02-10 at 07:45 -0700, Greg Spiegelberg wrote:
> All,
> 
> I'm planning a migration for a customer with a PostgreSQL 8.4 database
> cluster running CentOS 4.8 32-bit.  The target platform is CentOS 6.2
> 64-bit and will be running PostgreSQL 8.4 (our application delivers and
> supports 8.4, don't bother bringing up 9.x).  If this were a small database
> cluster I wouldn't worry about it however the 8.4 database cluster is about
> 900 GB right now.  The documented and proper way to move this data is via a
> dump-restore however I'm not sure my customer wants days or potentially
> weeks of downtime so I'm searching for options.
> 
> Option 1: dump-restore
> I've performed a handful of these for other customers and even the 100 GB
> database cluster using the network transfer method "pg_dumpall | ssh target
> -c 'cat - | psql postgres'" can be slow as in 8+ hours.
> 

Right.

> Option 2: Slony-I
> Is Slony-I an alternative when moving data from 32-bit to 64-bit?
> 

Yes, absolutely.

> Option 3: pg_upgrade
> Is this an option?  Remember, I'm going from 8.4 32-bit to 8.4 64-bit.
> 

No because of the 32/64 bit change.

> Option 4: PITR
> I believe this is not a possibility because of the bit-ness change but I'm
> listing anyways in case I'm mistaken.
> 

No because of the 32/64 bit change.

> Did I miss anything?
> 

Well, you can also use Londiste, and probably Bucardo to do this. But I
guess they are your only options with Slony.


-- 
Guillaume
http://blog.guillaume.lelarge.info
http://www.dalibo.com


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