From: | Michael Nolan <htfoot(at)gmail(dot)com> |
---|---|
To: | Chris Angelico <rosuav(at)gmail(dot)com> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: Replication/cloning: rsync vs modification dates? |
Date: | 2012-07-16 15:58:57 |
Message-ID: | CAOzAquJBMi-GnCAHf9Y6g2_K9TV00bvnA3dVMECHWS58tz0SdQ@mail.gmail.com |
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Lists: | pgsql-general |
On 7/16/12, Chris Angelico <rosuav(at)gmail(dot)com> wrote:
> On Tue, Jul 17, 2012 at 1:40 AM, Michael Nolan <htfoot(at)gmail(dot)com> wrote:
>> I did several weeks of tests on 9.1.3 using mod time and file size
>> rather than checksumming the files, that did not appear to cause any
>> problems
>> and it sped up the rsync considerably. (This was about a 40 GB
>> database.)
>
> Thanks! Is file size a necessary part of the check, or can mod time
> alone cover it?
>
> I'm looking at having my monitoring application automatically bring
> database nodes up, so it looks like the simplest way to handle it will
> be to have the new slave mandatorially do the backup/rsync, even if
> it's been down for only a couple of minutes. With a mod time check, I
> could hopefully do this without too much hassle.
As I understand the docs for rsync, it will use both mod time and file size
if told not to do checksums.
--
Mike Nolan
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