Re: Use of rsync for data directory copying

From: "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>
To: "Bruce Momjian" <bruce(at)momjian(dot)us>, "Stephen Frost" <sfrost(at)snowman(dot)net>
Cc: "David Kerr" <dmk(at)mr-paradox(dot)net>, "PostgreSQL-development" <pgsql-hackers(at)postgreSQL(dot)org>
Subject: Re: Use of rsync for data directory copying
Date: 2012-07-24 17:16:06
Message-ID: 500E9206020000250004910B@gw.wicourts.gov
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Bruce Momjian <bruce(at)momjian(dot)us> wrote:

> if a write happens in both the first and second half of a second,

While I'm not sure whether I believe that granularity is really to
the nanosecond, a stat of a table in a production database on xfs
shows this:

Modify: 2012-07-24 10:15:44.096415501 -0500

So presumably both writes would need to happen within a much smaller
time frame than a second.

-Kevin

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