From: Stan Hoeppner <stan@hardwarefreak.com>
To: Chris Murphy <lists@colorremedies.com>
Cc: "linux-raid@vger.kernel.org list" <linux-raid@vger.kernel.org>
Subject: Re: Usefulness of RAID 4
Date: Wed, 20 Feb 2013 12:15:50 -0600 [thread overview]
Message-ID: <512512D6.6080104@hardwarefreak.com> (raw)
In-Reply-To: <CBC74AA5-EA3C-4B35-B43E-9C1F12C864CE@colorremedies.com>
On 2/19/2013 4:46 PM, Chris Murphy wrote:
> But is it remotely practical/useful to use HDDs for data drives, and one SSD as the parity drive to eliminate the parity write bottleneck of RAID 4?
I don't see how. The SSD dedicated to parity must have the same
capacity as the HDDs. The largest non PCIe monster SDDs are right at
1TB and the cheapest of those is ~$1000. If the goal is to do an end
run around slow parity writes of RAID4, then RAID10/0+1/etc with HDDs
gives a lot more capacity and performance for the same or less money.
Hybrid RAID4 setup:
2TB net capacity
Mushkin Enhanced 2.5" 960GB = $1000
2x Hitachi 1TB 7.2K 2.5" = $ 200
$1200
RAID10 setup:
6TB net capacity
12x Hitachi 1TB 7.2K 2.5" = $1200
The RAID10 setup has 3x write performance and capacity for the same
money, albeit with more power draw and more ports required.
--
Stan
prev parent reply other threads:[~2013-02-20 18:15 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-19 3:01 Usefulness of RAID 4 Chris Murphy
2013-02-19 22:41 ` Stan Hoeppner
2013-02-19 22:46 ` Chris Murphy
2013-02-19 22:58 ` Stan Hoeppner
2013-02-19 23:07 ` Chris Murphy
2013-02-20 7:56 ` David Brown
2013-02-20 19:24 ` Chris Murphy
2013-02-20 18:15 ` Stan Hoeppner [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=512512D6.6080104@hardwarefreak.com \
--to=stan@hardwarefreak.com \
--cc=linux-raid@vger.kernel.org \
--cc=lists@colorremedies.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.