Re: Online verification of checksums

From: Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>
To: Michael Banck <michael(dot)banck(at)credativ(dot)de>, Stephen Frost <sfrost(at)snowman(dot)net>
Cc: Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr>, David Steele <david(at)pgmasters(dot)net>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: Online verification of checksums
Date: 2018-09-29 08:51:23
Message-ID: ad9df50b-6d9d-f91e-8146-45c0b2cd6c9b@2ndquadrant.com
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Hi,

One more thought - when running similar tools on a live system, it's
usually a good idea to limit the impact by throttling the throughput. As
the verification runs in an independent process it can't reuse the
vacuum-like cost limit directly, but perhaps it could do something
similar? Like, limit the number of blocks read/second, or so?

regards

--
Tomas Vondra http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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