Re: Linux: Why software RAID?

Joel Jaeggli
2006-09-04T17:32:14Z

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.

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Joel Jaeggli Unix Consulting joelja@uoregon.edu
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