Presenting LUNs to Hyper-V 2012

Here are my notes on presenting a LUN from a 3PAR 7400 SAN to a Hyper-V 2012 server running no GUI. The SAN is connected to the server via Fiber. There is a FC switch in between which has been properly configure, zoned, etc. Multiple paths to the same LUNs are configured for redundancy and speed so we need MPIO.

Procedure:

1. Install MPIO feature and reboot the Hyper-V server

Note that I did not run the mpiocpl GUI or the mpclaim command as I described here earlier. You may have to do that.

2. From  inside the SAN management console, present a LUN to the Hyper-V server.

Note: while creating the volume/LUN make sure to check the size against the “Chunklet Calc” worksheet inside this spreadsheet – “3PAR Design Spreadsheet v2” so that  no chunklets are stranded. For example, it is better to have a 504 GB LUN than a 500 GB LUN. A 10 GB LUN wastes 6 GB space! A 16 GB LUN wastes nothing. So you  have to play around with the numbers in the spreadsheet.

3. At this point you have two options – use GUI disk management tool from a remote client machine running Windows 8 OR on Hyper-V server itself run these commands:

diskpart

DISKPART>list disk (You may see your disk listed but if not run a rescan command)

DISKPART>rescan

DISKPART>list disk (Now you should see your new disk listed but it probably is offline)

DISKPART>list volume (this shows all your current volumes and their drive letters)

DISKPART>Select disk 1

DISKPART>online disk

DISKPART>detail disk (this will give you detailed info)

DISKPART>attributes disk clear readonly

DISKPART>clean

DISKPART>convert mbr

DISKPART>create partition primary

DISKPART>select part 1

DISKPART>format fs=ntfs label=SANtest quick

DISKPART>assign letter E

DISKPART>list volume (you should see the new volume  now)

Full diskpart syntax can be seen here

Credits and more information here