From: Mario Giammarco <mgiammarco@virgilio.it>
To: Craig Tierney <ctierney@hpti.com>, linux-scsi@vger.kernel.org
Subject: Re: Best driver for qlogic 2200 fc?
Date: Tue, 18 Nov 2003 20:19:52 +0100 [thread overview]
Message-ID: <1069183192.4927.3.camel@cala> (raw)
In-Reply-To: <1069085218.14602.63.camel@localhost.localdomain>
Il lun, 2003-11-17 alle 17:06, Craig Tierney ha scritto:
> > Unfortunately it gives me slow performance (sequential read of 30mb/sec on a
> > seagate 318452fc that can do 60mb/sec sequential read).
> >
>
> What is your write performance? Have you tried
> to tune /proc/sys/vm/{min,max}-readahead?
I have tuned readahead and not it goes 50 mb.
I am shocked, why I need to tune it?
Usually I do an hdparm -t -T to see if hard disk is good
(and eventually hdparm again to tune ide interface)
Without tuning I can reach sequential read of more than 60 mb using raid0.
I do not understand why the OS cannot use the full speed of this FC drive.
OTOH side I discovered that (in a raid1 array ) the two seagate write speed is very low: 10mb/s, why?
prev parent reply other threads:[~2003-11-18 19:20 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-11-17 16:11 Best driver for qlogic 2200 fc? Mario Giammarco
[not found] ` <1069085218.14602.63.camel@localhost.localdomain>
2003-11-18 19:19 ` Mario Giammarco [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=1069183192.4927.3.camel@cala \
--to=mgiammarco@virgilio.it \
--cc=ctierney@hpti.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 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.