From: Stan Hoeppner <stan@hardwarefreak.com>
To: weber@zbfmail.de, Xfs <xfs@oss.sgi.com>
Subject: Re: elevator question
Date: Mon, 17 Mar 2014 17:51:02 -0500 [thread overview]
Message-ID: <53277C56.7000002@hardwarefreak.com> (raw)
In-Reply-To: <ea0e10e64a65dbd39cd71a826e18985e@zbfmail.de>
On 3/17/2014 10:35 AM, Marko Weber|8000 wrote:
>
> hello list,
> in the xfs faq i read elevator=noop is best when using ssd.
> i have the gentoo system on a ssd, but the larger data storage partition
> on softraid with some sata disks.
> is elevator=noop in this combo still best?
The elevator is per physical device. For SSD use noop. But with your
setup is doesn't matter as md/RAID will run at rust speed.
A better solution is to remove the SSD partition from the md/RAID array,
reshape/shrink/rebuild the array to make it happy, whatever is necessary
after removing the SSD partition.
Now configure the SSD partition as bcache and enable writeback policy.
This will increase the performance of the rust array to SSD level for
writes, and for reads after frequently accessed data is cached in your SSD.
--
Stan
_______________________________________________
xfs mailing list
xfs@oss.sgi.com
http://oss.sgi.com/mailman/listinfo/xfs
next prev parent reply other threads:[~2014-03-17 22:51 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-17 15:35 elevator question Marko Weber|8000
2014-03-17 15:39 ` Grozdan
2014-03-17 17:25 ` Marko Weber|8000
2014-03-17 17:38 ` Shaun Gosse
2014-03-17 17:45 ` Emmanuel Florac
2014-03-17 22:51 ` Stan Hoeppner [this message]
2014-03-18 9:26 ` Emmanuel Florac
2014-03-18 10:18 ` Marko Weber|8000
2014-03-18 13:56 ` Emmanuel Florac
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=53277C56.7000002@hardwarefreak.com \
--to=stan@hardwarefreak.com \
--cc=weber@zbfmail.de \
--cc=xfs@oss.sgi.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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox