From: Joel Jaeggli <joelja@uoregon.edu>
To: Bill Davidsen <davidsen@tmr.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
Marc Perkel <marc@perkel.com>,
Adam Kropelin <akropel1@rochester.rr.com>,
Jeff Garzik <jeff@garzik.org>,
Linux Kernel <linux-kernel@vger.kernel.org>,
Linux RAID Mailing List <linux-raid@vger.kernel.org>
Subject: Re: Linux: Why software RAID?
Date: Mon, 04 Sep 2006 10:31:12 -0700 [thread overview]
Message-ID: <44FC62E0.6030202@uoregon.edu> (raw)
In-Reply-To: <44FC62EF.7040100@tmr.com>
Bill Davidsen wrote:
> Alan Cox wrote:
>
>> Ar Iau, 2006-08-24 am 07:31 -0700, ysgrifennodd Marc Perkel:
>>
>>
>>> So - the bottom line answer to my question is that unless you are
>>> running raid 5 and you have a high powered raid card with cache and
>>> battery backup that there is no significant speed increase to use
>>> hardware raid. For raid 0 there is no advantage.
>>>
>>>
>> If your raid is entirely on PCI plug in cards and you are doing RAID1
>> there is a speed up using hardware assisted raid because of the PCI bus
>> contention.
>>
>
> I would expect to see this with RAID5 as well, for the same reason...
assuming you actually have lots of pci contention that might be a
consideration... if you're sitting on server class hardware with
multiple pci buses or using pci-express cards that won't be a
significant issue.
--
------------------------------------------------------------------------
Joel Jaeggli Unix Consulting joelja@uoregon.edu
GPG Key Fingerprint: 5C6E 0104 BAF0 40B0 5BD3 C38B F000 35AB B67F 56B2
next prev parent reply other threads:[~2006-09-04 17:31 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-24 3:34 Linux: Why software RAID? Jeff Garzik
2006-08-24 4:22 ` Richard Scobie
2006-08-24 8:19 ` Jeff Garzik
2006-08-24 20:08 ` Richard Scobie
2006-08-24 5:20 ` Chris Friesen
2006-08-24 5:25 ` H. Peter Anvin
2006-08-26 20:55 ` Dan Williams
2006-08-24 5:43 ` Mattias Wadenstein
2006-08-24 13:07 ` Adam Kropelin
2006-08-24 13:20 ` Alan Cox
2006-08-24 13:36 ` Adam Kropelin
2006-08-24 13:42 ` Gordon Henderson
2006-09-04 17:29 ` Bill Davidsen
2006-08-24 14:55 ` Mark Lord
[not found] ` <44EDB843.2020608@perkel.com>
2006-08-24 15:21 ` Alan Cox
2006-09-04 17:31 ` Bill Davidsen
2006-09-04 17:31 ` Joel Jaeggli [this message]
-- strict thread matches above, loose matches on Subject: below --
2006-08-26 3:50 linux
2006-08-26 12:18 ` Raz Ben-Jehuda(caro)
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