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Subject: Re: Backup question
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From: Vibhor Kumar <vibhor.aim@gmail.com>
In-Reply-To: <AANLkTi=z9E+yeH=2Wf6xKB3-_67rjzbQNdmYFU2V-NOO@mail.gmail.com>
Date: Tue, 1 Mar 2011 15:43:22 +0530
Cc: pgsql-admin@postgresql.org
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Message-Id: <514EC5D0-4703-4073-8AD2-59E0A7E9893F@gmail.com>
References: <AANLkTi=z9E+yeH=2Wf6xKB3-_67rjzbQNdmYFU2V-NOO@mail.gmail.com>
To: A B <gentosaker@gmail.com>


On Mar 1, 2011, at 3:20 PM, A B wrote:

>=20
> But what would happen if you
> 1. run rsync
> 2. throw server through the window and buy new server
> 3. copy the rsynced data
> 4. start server
> now, what would happen?
> I guess the server would think: uh-oh, it has crashed, I'll try to fix =
it.

This will give you Inconsisten Backup and PG will try to recover the =
database

> I understand that you will loose data, but will it be able to get
> database in shape and running?
May be Or may not be. I have seen scenario's where people had to use =
pg_resetxlog=20

> And to reduce the amount of lost data,  is there any clever "sync"
> command I can run before step 1 to write more stuff to disk?

Have a look of Hot/Online Backup.
http://www.postgresql.org/docs/8.4/interactive/continuous-archiving.html

Thanks & Regards,
Vibhor=