From: Joshua D. Drake <jd@commandprompt.com>
To: Thomas F. O'Connell <tfo@sitening.com>
Cc: Kenji Morishige <kenjim@juniper.net>
Cc: pgsql-performance@postgresql.org
Subject: Re: most bang for buck with ~ $20,000
Date: Tue, 08 Aug 2006 16:24:07 -0700
Message-ID: <44D91D17.30106@commandprompt.com> (raw)
In-Reply-To: <82C06632-148B-4489-90EB-BBB8A6BD1159@sitening.com>
References: <20060808204354.GN29379@juniper.net>
<44D906E1.7010405@commandprompt.com>
<9EE66C7F-0B04-4472-9EBD-CD567AC9EA1D@sitening.com>
<44D90FFE.7010807@commandprompt.com>
<82C06632-148B-4489-90EB-BBB8A6BD1159@sitening.com>
>
> In which case, which is theoretically better (since I don't have a
> convenient test bed at the moment) for WAL in a write-heavy environment?
> More disks in a RAID 10 (which should theoretically improve write
> throughput in general, to a point) or a 2-disk RAID 1? Does it become a
> price/performance question, or is there virtually no benefit to throwing
> more disks at RAID 10 for WAL if you turn off journaling on the filesystem?
Over 4 drives, I would gather that RAID 10 wouldn't gain you anything.
Possibly over 6 or 8 however, it may be faster because you are writing
smaller chunks of data, even if two copies of each.
Sincerely,
Joshua D. Drake
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To: pgsql-performance@postgresql.org
Cc: jd@commandprompt.com, tfo@sitening.com, kenjim@juniper.net
Subject: Re: most bang for buck with ~ $20,000
In-Reply-To: <44D91D17.30106@commandprompt.com>
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