Re: Raid performace issues (Raid 5 vs. Raid 0+1) with database files

"Andrew L. Garman" wrote:
>
> > With the 5200 you have hardware RAID5 so writing should be nice and
> > fast, not that much different from 0+1, and RAID 0+1 is probably not
> > justifiable for extra tiny perf gain agianst cost of disks.
>
> The A5200 does not have hardware RAID5. None of the A5x00 series have
> hardware RAID. The closest you can get is using the Fast Write Cache Card
> that has 32 MB of mirrored NVRAM on it. I have to say, in large
> installations, that card doesn't have enough NVRAM.
>
> If you want to do hardware RAID with Sun products, the A1000, A3500 (with
> D1000 in the cabinet), A7000 and Sun's PCI RAID controller for E250 and
> E450 are the only options. The A5x00 series don't work well with RAID-5!
> The D1000 (standalone, without the A3500) is even worse!
>
> Regards,
>
> Andrew Garman
> Goliath Networks, inc.
> a Sun Elite Reseller &
> IBM Storage Partner :)

I stand corrected. We've got A1000's here for precisely the reason that it does hardware RAID. In this case you are 'stuck' with RAID 0+1. But agian testing of placing the various files in various combination for you specific application is the way forward.

Martin Received on Thu Sep 02 1999 - 02:10:33 CDT