Re: Migration of PGDATA - Mailing list pgsql-admin

Only out of curiosity, is your current server 32 bit or 64?
Are you migrating 32 to 32 or 64 to 64?

Thank you

Renato



Renato Oliveira
Systems Administrator
e-mail: renato.oliveira@grant.co.uk

Tel: +44 (0)1763 260811
Fax: +44 (0)1763 262410
http://www.grant.co.uk/

Grant Instruments (Cambridge) Ltd

Company registered in England, registration number 658133

Registered office address:
29 Station Road,
Shepreth,
CAMBS SG8 6GB
UK

-----Original Message-----


From: pgsql-admin-owner@postgresql.org [mailto:pgsql-admin-owner@postgresql.org] On Behalf Of "Martin Münstermann"
Sent: 29 March 2010 11:50
To: Robert Joosten; pgsql-admin@postgresql.org
Subject: Re: [ADMIN] Migration of PGDATA

Hi,

> > is it safe to move the PGDATA directory from one system to another when
> migrating from one operating system to another?
> > For example: migrating from Debian to RHEL, or from RHEL4 to RHEL5?
> > The database is of course shutdown properly, and the PG major versions
> match.
> > Or is a dump/restore necessary in these cases?
>
> Besides the other reply, take into account little- versus bigendian
> changes if you switch hardware.

Good point. But as we stick to Linux on Intel, we expect no problems there.

> But just out of curiosity: why propose against a dump/restore ? I mean:
> when I upgrade between major releases I dump as well, as it is
> recommended. I never ran into trouble, you know.

It's a question of migration duration aka downtime.
Our PGDATA resides on a SAN, so moving/migrating the directory takes a couple of seconds. A dump/restore cycle would
takemuch longer. 

Thanks,
 Martin

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