From: Phil Monroe <phil@identified.com>
To: Heikki Linnakangas <hlinnakangas@vmware.com>
Cc: pgsql-admin@postgresql.org, Infrastructure <infrastructure@identified.com>
Cc: Vladimir Giverts <vlad@identified.com>
Cc: Tejas <tejas@identified.com>
Cc: Sasha Kipervarg <sasha@identified.com>
Subject: Re: Postgres WAL Recovery Fails... And Then Works...
Date: Tue, 15 Jan 2013 10:33:42 -0800
Message-ID: <50F5A106.3050109@identified.com> (raw)
In-Reply-To: <50F534C6.4000501@vmware.com>
References: <50F0CB3E.4080708@identified.com>
<50F534C6.4000501@vmware.com>
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Sorry, Initial response got blocked since I replied with the logs quoted
again.
>
> Also, which version of postgres are you using?
PostgreSQL 9.2.1 on Ubuntu 12.04
>
>
> Except in my case no number of restarts helped. You didn't say, were
> you explicitly copying $PGDATA or using some other mechanism to
> migrate the data elsewhere?
So we have a very large database (~5TB), so we use a script to do
parallel rsyncs to copy the data directory
(https://gist.github.com/4477190/#file-pmrcp-rb). The whole copy process
ended up taking ~3.5 hours. So we did a physical copy of $PGDATA (which
is located at /var/lib/postgresql/9.2/main/ on both machines.). We
followed the following process to do this:
1. Master archives WAL files to Backup Host.
2. Execute on Master: psql -c "select pg_start_backup('DATE-slave-restore')"
3. Execute on Master: RCP='rsync -cav --inplace -e rsh'
EXCLUDE='pg_xlog' pmrcp /var/lib/postgresql/9.2/main/
prd-db-01:/var/lib/postgresql/9.2/main/ > /tmp/backup.log
4. Execute on Master: psql -c "select pg_stop_backup()"
5. On Slave, setup recovery.conf to read WAL archive on Backup Host
6. Execute on Slave: pg_ctlcluster 9.2 main start (as described in
initial email)
Best,
Phil
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To: pgsql-admin@postgresql.org
Cc: phil@identified.com, hlinnakangas@vmware.com, infrastructure@identified.com, vlad@identified.com, tejas@identified.com, sasha@identified.com
Subject: Re: Postgres WAL Recovery Fails... And Then Works...
In-Reply-To: <50F5A106.3050109@identified.com>
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