[Gllug] [OT] Re: cheap disk source

[Rich Walker]

Anthony Newman <anthony.newman at ossified.net> writes:

> John Hearns wrote:
>> 
>> Of course, if you have the requirement and the budget (ie twice the 
>> number of disks!) there is RAID 51 - mirrored RAID 5 sets.
>> You pays your money and you takes your choice.
>> 
>
> I would contend that "RAID15" (RAID-5 on mirrored pairs) would be 
> superior. Proof of this is left as an exercise to the reader ;)

After various fun with machines, I've ended up moving to LVM-on-RAID-1.

RAID-1 because it's clean and simple - you can always find a pair of
mostly-matched drives (or split a drive in 2 and use it as halves of two
mirrors if needed).

LVM because it then obviates the need for me to mess with another layer
of RAID. I can always tell LVM to do RAID-0, as well as tell it to move
extents off a RAID-1 PV when that PV starts looking iffy.

(Actually, the whole PV/VG/LV thing took a while to get my head round -
it's about the hardest bit of the whole system!)

cheers, Rich.

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