From: Gregory Haskins <gregory.haskins@gmail.com>
To: emilne@redhat.com
Cc: linux-scsi@vger.kernel.org
Subject: Re: Slow writes to SAS drives on LSI mpt2sas HBA
Date: Thu, 6 Dec 2012 20:43:38 -0500 [thread overview]
Message-ID: <450090F8-2B0F-4B38-AB7C-2154C75043F9@gmail.com> (raw)
In-Reply-To: <1354572400.4420.66.camel@localhost.localdomain>
Hello Ewan
On Dec 3, 2012, at 5:06 PM, Ewan Milne <emilne@redhat.com> wrote:
>>
>
> It sounds like your drive write cache is disabled, 7200RPM is 120
> revolutions/sec, and you are getting 7747584 / 1024 / 63.59 = ~119 IO/s
> I believe the write cache is enabled by default on SATA drives, which
> would explain the difference.
You were exactly right. Thank you!
A quick "sdparm -S -set=WCE <dev>" and I was back to where I expected.
Thanks again,
-Greg
prev parent reply other threads:[~2012-12-07 1:43 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-03 19:48 Slow writes to SAS drives on LSI mpt2sas HBA Gregory Haskins
2012-12-03 22:06 ` Ewan Milne
2012-12-07 1:43 ` Gregory Haskins [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=450090F8-2B0F-4B38-AB7C-2154C75043F9@gmail.com \
--to=gregory.haskins@gmail.com \
--cc=emilne@redhat.com \
--cc=linux-scsi@vger.kernel.org \
/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