Re: [opensuse] mdraid questions

On 05/02/2012 12:11 PM, Per Jessen wrote:
Is there anything else I'm forgetting to consider?
Battery-backed write caches or site-wide UPS?
Staging disk purchases by production dates?

Your initial RAID61 config will survive up to five concurrent disk
failures (worst case) - is there a better config?


Hi Per,

Yes, we have battery-backed write caches (supercapacitor actually)
and a good UPS. Staging disk purchases is a good suggestion!

I initially wanted to set the 24-disks up as a RAID-60 with two
hotspares. I tried this and actually measured 1.3-GB/sec average
write bandwidth. These are SATA disks, not SAS. This would have
allowed up to six disk failures, which would have been good enough
I'm sure. But the customer also wanted full duplication of all
recorded data in the field. Not only that, but the on-site
operators aren't Linux geeks, so we wanted the process to be as
turn-key as possible. mdraid-1 seemed to fit the bill.

Regards,
Lew

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