From: David Greaves <david@dgreaves.com>
To: Raz Ben Jehuda <razb@bitband.com>
Cc: djani22@dynamicweb.hu, linux-raid@vger.kernel.org
Subject: Re: RAID5 question.
Date: Thu, 04 Aug 2005 15:56:15 +0100 [thread overview]
Message-ID: <42F22C8F.4000407@dgreaves.com> (raw)
In-Reply-To: <1123164866.8854.0.camel@localhost.localdomain>
And notice you can apply different readahead to:
The raw devices (/dev/sda)
The md device (/dev/mdX)
Any lvm device (/dev/lvm_name/lvm_device)
David
Raz Ben Jehuda wrote:
>read the blockdev man page
>
>On Thu, 2005-08-04 at 16:06 +0200, djani22@dynamicweb.hu wrote:
>
>
>>Hi list, Neil!
>>
>>I have a little question because I'v got some performance problem...
>>Is the RAID5 do any type of headahead with the default config?
>>It is possible to disable the readahead? (if it is.)
>>Or just the io_sched do that on the disks?
>>
>>How can I disable the whole headahead on top of the RAID5 array?
>>
>>The RAID5 can do multiple small (<4kb) reads of disks for the multithreaded
>>read requests?
>>(chunk size is 32k)
>>
>>Thanks for helping!
>>
>>Janos
>>
>>-
>>To unsubscribe from this list: send the line "unsubscribe linux-raid" in
>>the body of a message to majordomo@vger.kernel.org
>>More majordomo info at http://vger.kernel.org/majordomo-info.html
>>
>>
--
next prev parent reply other threads:[~2005-08-04 14:56 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-04 5:43 ANNOUNCE: mdadm 2.0-devel-3 DEVELOPMENT RELEASE - A tool for managing Soft RAID under Linux Neil Brown
[not found] ` <01f001c598fd$c59a51a0$0400a8c0@LocalHost>
[not found] ` <1123164866.8854.0.camel@localhost.localdomain>
2005-08-04 14:56 ` David Greaves [this message]
2005-08-04 15:45 ` RAID5 question djani22
2005-08-04 15:56 ` Raz Ben Jehuda
2005-08-04 16:13 ` djani22
2005-08-04 16:25 ` Raz Ben Jehuda
2005-08-04 16:43 ` djani22
2005-08-04 20:53 ` Neil Brown
2005-08-07 11:40 ` David Greaves
-- strict thread matches above, loose matches on Subject: below --
2003-03-22 12:10 raid5 question Gabriele Alberti
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