From: Aidan Van Dyk <aidan@highrise.ca>
To: Mario Weilguni <mweilguni@sime.com>
Cc: Joshua D. Drake <jd@commandprompt.com>
Cc: Scott Marlowe <scott.marlowe@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Experience with HP Smart Array P400 and SATA drives?
Date: Wed, 10 Dec 2008 10:52:08 -0500
Message-ID: <20081210155208.GR26596@yugib.highrise.ca> (raw)
In-Reply-To: <493FB619.5060205@sime.com>
References: <4934FE60.30702@sime.com>
<dcc563d10812051500h331ac82fp62142cf611b3a79d@mail.gmail.com>
<493E6023.3030800@sime.com>
<1228838308.13962.0.camel@jd-laptop.pragmaticzealot.org>
<20081209161750.GO26596@yugib.highrise.ca>
<493FB619.5060205@sime.com>
* Mario Weilguni <mweilguni@sime.com> [081210 07:31]:
> Why not? I know it's not performing as good as RAID-10, but it does not
> waste 50% diskspace. RAID-6 is no option, because the performance is
> even worse. And, on another system with RAID-5 + spare and SAS drives,
> the same controller is working very well.
Like Scott said, it's all about trade-offs.
With raid5, you get abysmal write performance, "make me not sleep at
night" inconsistent parity issues, and a degraded mode that will a
nightmare ...
... and as a trade-off you save a little money, and get good "read only"
performance ...
... as long as you don't ever have a disk or system crash ...
... or can afford to rebuild if you do ...
... etc ...
--
Aidan Van Dyk Create like a god,
aidan@highrise.ca command like a king,
http://www.highrise.ca/ work like a slave.
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To: pgsql-performance@postgresql.org
Cc: aidan@highrise.ca, mweilguni@sime.com, jd@commandprompt.com, scott.marlowe@gmail.com
Subject: Re: Experience with HP Smart Array P400 and SATA drives?
In-Reply-To: <20081210155208.GR26596@yugib.highrise.ca>
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