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From: Pierre C <lists@peufeu.com>
To: Scott Marlowe <scott.marlowe@gmail.com>
To: Gael Le Mignot <gael@pilotsystems.net>
Cc: Craig James <craig_james@emolecules.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Compared MS SQL 2000 to Postgresql 9.0 on Windows
Date: Sat, 18 Dec 2010 14:55:26 +0100
Message-ID: <op.vnwwyom4eorkce@apollo13> (raw)
In-Reply-To: <plop87wrn7wk4u.fsf@aoskar.kilobug.org>
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	<AANLkTin4K86j2-GOUfmdXQ8UKv_j9V8ZRiRBEbbXj+jc@mail.gmail.com>
	<20101207201028.GE4028@aart.is.rice.edu>
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	<fd4bd31b523753145cf67ae6e6cb4aec@mail.gmail.com>
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	<4D0B9EB0.1070708@emolecules.com>
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	<plop87wrn7wk4u.fsf@aoskar.kilobug.org>


>  > The real performance problem with RAID 5 won't show up until a drive
>  > dies and it starts rebuilding
>
> I don't  agree with that. RAID5 is  very slow for random  writes, since
> it needs to :

"The real problem" is when RAID5 loses a drive and goes from "acceptable"  
kind of slow, to "someone's fired" kind of slow. Then of course in the  
middle the rebuild, a bad sector is discovered in some place the  
filesystem has never visited yet on one of the remaining drives, and all  
hell breaks loose.

RAID6 is only one extra disk...



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