SATA Raid

Robin Humble rjh-tkNKonCg4laeFQavDyXPBQ at public.gmane.org
Sun Jun 18 17:23:33 UTC 2006


On Sat, Jun 17, 2006 at 11:50:15PM -0400, Dave Cramer wrote:
>On 17-Jun-06, at 8:06 PM, Robin Humble wrote:
>>On Fri, Jun 16, 2006 at 08:51:45PM -0400, Dave Cramer wrote:
>>>The areca cards are quite good
>>are they faster than software raid5?
>Well, there are other things besides speed. Hotswapping, battery  
>backup, write cache, etc

good points.
however if I put the software raid machine on a UPS, run it with 2 or
4G of ram, and use SATA drives then I have all of the above don't I?

hmmm... plus or minus how happy Linux and mdadm is with hotswapping
SATA drives - how well does that work these days?
you need a bit of chassis support, but that's trivial compared to
traumas that the kernel might suffer if it's not happy with SATA drives
coming and going.

>I've heard that software raid was fast, or faster, but I still use  
>hardware raid cards, for the above reasons.

yeah, we currently do as well. but next time out we'll probably re-try
software raid.

cheers,
robin
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