Configuring Pool and virtual disk for MD3200 PowerEdge.

JamesNT
JamesNT used Ask the Experts™
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We have an MD3200 for storage in our HYPERV cluster.  We used the wizard to create a pool on the MD3200 which seems to have set aside 2 disks for redundancy (basically, a RAID 6, I believe).

I create a virtual disk in the pool, I wanted to use up all the available space.  However, the MD3200 starts complaining about > 80% (I believe the default) of the pool being used up.  Can I just turn that off or do I truly need to ensure the virtual disk takes up less than 80% of the space of the pool?

JamesNT
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Philip ElderTechnical Architect - HA/Compute/Storage

Commented:
As a rule, it's best to split the available storage up at least 50/50 and keep one LUN attached to each of the two controllers. This splits the I/O and provides some level of redundancy of one of the controllers or network pathways fail.

Author

Commented:
Can one virtual disk be split up like that?

JamesNT
Top Expert 2014
Commented:
If you use disk pools rather than disk groups you aren't using a standard RAID level as any "hot spares" are distributed so all disks are in use, this is the reserve capacity. You can set reserve capacity to zero if you want but if you do the array will be degraded if a disk fails rather than automatically rebuilding parity onto the remaining disks. When you create the pool there are tiny up/down arrows to set the reserve capacity. See https://www.youtube.com/watch?v=BQCYcLWd3Gg at 2:17

https://library.netapp.com/ecmdocs/ECMP12404965/html/GUID-807DB3DC-DE47-4802-A87D-EA0C26DFA9B6.html says it auto-assigns the RAID level so in your case it has used RAID 6, and the 20% unused is a couple of hot spares worth.

You can't split a virtual disk up, but if you create two virtual disks in the pool each controller manages one. LSI//NetApp Engenios which the MD3200 is badged from split the work at the LUN level, DotHill/HPE MSAs split it up at the array level.

Author

Commented:
thank you both.

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