Re: Serial ATA Hardware RAID recommendations?
On Fri, 04 Nov 2005, Chris Boot wrote:
> 1. Take 5/6 SATA disks for RAID 5/6/10
> 2. Allow them to be hot-plugged (with or without Jeff Garzik's
> in-progress SATA hotplug patches)
> 3. Do the work in hardware
Then you certainly won't need any patch, as the hotplugging will be done by
the SATA RAID controller :-)
I'd suggest one that handles saf-te enclosures, and a saf-te enclosure
(hotswap bay) to go with it.
> All I've done previously is software RAID 10 which I'm happy with, but
> I'm now building a high-performance database / file server and don't
> want the machine spending time calculating parity and so on.
AFAIK RAID10 requires any parity calculation. What the hardware controller
will give you is easier hotplugging, better SAF-TE support, and more SATA
ports. If it is not a good RAID controller, you could easily actually lose
performance in every RAID level.
For RAID 5 and RAID 6, AFAIK if you want good performance you need a damn
good RAID controller, the type that have IOP321 or IOP331 processors at the
very least, and a lot of onboard battery-backed SDRAM in it.
--
"One disk to rule them all, One disk to find them. One disk to bring
them all and in the darkness grind them. In the Land of Redmond
where the shadows lie." -- The Silicon Valley Tarot
Henrique Holschuh
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