[152145] in North American Network Operators' Group
Re: Most energy efficient (home) setup
daemon@ATHENA.MIT.EDU (George Herbert)
Sun Apr 15 07:29:14 2012
In-Reply-To: <20120414150449.GA25347@hiwaay.net>
From: George Herbert <george.herbert@gmail.com>
Date: Sun, 15 Apr 2012 04:28:26 -0700
To: Chris Adams <cmadams@hiwaay.net>
Cc: NANOG list <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
With RAID 4, the parity disk IOPS on write will rate-limit the whole LUN...
No big deal on a 4-drive LUN; terror on a 15-drive LUN...
George William Herbert
Sent from my iPhone
On Apr 14, 2012, at 8:04, Chris Adams <cmadams@hiwaay.net> wrote:
> Once upon a time, Jeroen van Aart <jeroen@mompl.net> said:
>> There may be a performance penalty using raid4, because it uses one
>> parity disk. Although that system looks like it can be useful for some
>> purposes it looks less ideal for home use. Also I don't see how it would
>> allow you to install your own OS.
>
> For read-mostly storage, there's no penalty as long as there's no disk
> failure. The parity drive wouldn't even spin up for reads.
> --
> Chris Adams <cmadams@hiwaay.net>
> Systems and Network Administrator - HiWAAY Internet Services
> I don't speak for anybody but myself - that's enough trouble.
>
