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

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Message-ID: <44FC62EF.7040100@tmr.com>
Date:	Mon, 04 Sep 2006 13:31:27 -0400
From:	Bill Davidsen <davidsen@....com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	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?

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...

-- 
bill davidsen <davidsen@....com>
  CTO TMR Associates, Inc
  Doing interesting things with small computers since 1979

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