On 18 Jan 2009, at 07:03, paul at clubi.ie wrote:
> On Sun, 18 Jan 2009, Niall O Broin wrote:
>>> ALL RAID is software - it's just a question of where the software
>> runs (and I include XOR engines here - still software, really, just
>> very specialised software, runing on very specialised hardware)
>> Hmm, not that specialised. The Mylex ones were small embedded
> computers (i960 and then XScale) - using normal SIMMs/DIMMs even.
> Never seen any PERC cards, but no doubt similar thing
Read what I said Paul. The processors on 'hardware' RAID cards are
many and various - I've even seen x86 variants used IIRC. However, I
referred to the dedicated XOR hardware included on some cards to
offload these calculations from the card's CPU - the only thing which
coudl reasonably be called hardware RAID, as it wasn't software
executing on a general purpose CPU - though I'd still argue that as
it's executing an algorithm, it's software.
Niall
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