linux-kernel - Re: Linux: Why software RAID?

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Date:	Mon, 04 Sep 2006 10:31:12 -0700
From:	Joel Jaeggli <joelja@...egon.edu>
To:	Bill Davidsen <davidsen@....com>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>, Marc Perkel <marc@...kel.com>,
	Adam Kropelin <akropel1@...hester.rr.com>,
	Jeff Garzik <jeff@...zik.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux RAID Mailing List <linux-raid@...r.kernel.org>
Subject: Re: Linux: Why software RAID?



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@...egon.edu
GPG Key Fingerprint:   5C6E 0104 BAF0 40B0 5BD3 C38B F000 35AB B67F 56B2
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