Unable to create new partition on SAN

Posted on 2008-11-04
Last Modified: 2013-11-14
I have recently blown away my SAN recently and am busy now creating new virtual disks for ESX to use. My SAN is a Dell MD3000i with 30 x 400GB SAS disks. I have assigned 8 of the physical disks into a RAID 5 group for use by an ESX cluster. I am able to mount and format LUN 0 successfully but I cannot get LUN 2 to format no matter what I try. I have looked at a bunch of posts around the new related to this issue and they all talk about using fdisk which doesn't work for me.

This is where I am at right now.

ESX can see all the LUN's on the SAN as per the output below

esxcfg-mpath -l
Disk vmhba0:0:0 /dev/sda (69376MB) has 1 paths and policy of Fixed
Local 2:14.0 vmhba0:0:0 On active preferred

Enclosure vmhba0:264:0 (0MB) has 1 paths and policy of Fixed
Local 2:14.0 vmhba0:264:0 On active preferred

Disk vmhba40:0:0 /dev/sdb (512000MB) has 1 paths and policy of Fixed
iScsi sw<-> vmhba40:0:0 On active preferred

Disk vmhba40:0:2 (512000MB) has 1 paths and policy of Fixed
iScsi sw<-> vmhba40:0:2 On active preferred

Doing a "fdisk -l" does not show up anything related to the new non-accessible LUN

I can mount vmhba40:0:2:0 on a windows machine, format it and use it without any issues.

This is the output from /vmfs/devices/disks

ls: vml.02000200006001e4f0003e139200001fac4910c89f4d4433303030: No such file or directory
vmhba0:0:0:0 vml.0200000000600188b03eb8f8000ce3fd966390184b504552432035
vmhba40:0:0:0 vml.02000000006001e4f0003e0b4c000034874910c4004d4433303030

How can I get fdisk to create a partition on the new LUN when it won't even see it?

I did see a post elsewhere that talked about a reprovisioned HP SAN having similar issues due to NTFS data being left behind and I tried everything in that post to no avail.

Please help if you can!

Question by:markpascoe
    LVL 18

    Expert Comment

    If ESX detects an NTFS volume it will not automatically resignature it to VMFS just like that.

    Try doing the steps described here:


    Accepted Solution

    The solution to this issue was to change the preferred owner of the volume to the other RAID controller on the SAN.

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