On Wed, May 12, 2010 at 02:04:29PM -0400, Tracy Reed wrote:
>On Wed, May 12, 2010 at 11:31:05AM -0400, Sam Hopkins spake thusly:
>> AoE screams using our target appliances.  Don't confuse the
>> limitations of an open source target implementation with limitations
>> inherent in AoE.
>
>I understand that this is probably by design. However, the complexity
>of getting AoE to perform well in initial tests hurts the ability to
>sell the appliance as a solution. I have recommended Coraid appliances
>4 times in the last few years. One company actually purchased. But
>when they found they could only export whole drives they ended up
>returning them as that setup was not suitable for their virtualization
>goals. Has that issue been corrected yet? This was 3-4 years ago.

It is certainly possible to create multiple LUNs within a single device.
These are all exported separately.  For example, given a 24 drive array,
you could make (for example), a 6 disk RAID5 array, two different 4 disk RAID 10
arrays, 10 disk RAID6 array, and 2 hot spares.  These would be exported
as 4 different devices in the form of /dev/ether/eX.Y (where X is the
shelf number, and Y is the LUN number).

You can't, however, create a large RAID10 array and export smaller
chunks of it.  (at least, not yet, I think that's being worked on)

-- 
Jesse Becker
NHGRI Linux support (Digicon Contractor)

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