From: Ivan Voras <ivoras@freebsd.org>
To: pgsql-performance@postgresql.org
Subject: Re: 8K recordsize bad on ZFS?
Date: Mon, 10 May 2010 21:13:54 +0200
Message-ID: <hs9ltj$c8q$1@dough.gmane.org> (raw)
In-Reply-To: <4BE852CE.9020802@agliodbs.com>
References: <4BE4ABC9.6040106@agliodbs.com>
<AANLkTim6rVYoAZaspbEnsyE9LPmWGXWe4Van40Snldoj@mail.gmail.com>
<4BE852CE.9020802@agliodbs.com>
On 05/10/10 20:39, Josh Berkus wrote:
> On 5/9/10 1:45 AM, Dimitri wrote:
>> Josh,
>>
>> it'll be great if you explain how did you change the records size to
>> 128K? - as this size is assigned on the file creation and cannot be
>> changed later - I suppose that you made a backup of your data and then
>> process a full restore.. is it so?
>
> You can change the recordsize of the zpool dynamically, then simply copy
> the data directory (with PostgreSQL shut down) to a new directory on
> that zpool. This assumes that you have enough space on the zpool, of
> course.
Other things could have influenced your result - 260 MB/s vs 300 MB/s is
close enough to be influenced by data position on (some of) the drives.
(I'm not saying anything about the original question.)
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To: pgsql-performance@postgresql.org
Cc: ivoras@freebsd.org
Subject: Re: 8K recordsize bad on ZFS?
In-Reply-To: <hs9ltj$c8q$1@dough.gmane.org>
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