Promise Pegasus 2 R4 - Can't Delete/Format Logical Volume

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Last Post 11 April 2018

Richard Glaser posted this 10 April 2018

Hello:

I have a new installation of Promise Pegasus 2 R4 6TB with RAID 5 created one logic drive then synced some data and then the volume stopped mounting. I tried repairing the volume with Disk Utility and DiskWarrior, but nothing could fix it. Since I had a backup of the data, I wanted start over, but I get errors trying to delete or format the logical drive like…

fail: Failed to delete logic drive. At least one volume cannot be unmounted

I tried forcing it to unmount with the following diskutil command…

diskutil umountDisk force disk4
Forced unmount of disk4 failed: at least one volume could not be unmounted

This is the output for diskutil list

/dev/disk4
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *6.0 TB     disk4
   1:                        EFI EFI                     209.7 MB   disk4s1
   2:                  Apple_HFS rserver                 6.0 TB     disk4s2

Any suggestions?

1 Comments

Yu Qin posted this 11 April 2018

Hi Richard, how about deleting logical drive one by one? Since you've confirmed all data is backed up, try:

1.power Pegasus off

2.eject PD2.3.4

3.power Pegasus on and delete RAID on PD1

If the above works please repeat for PD2.3.4. Also you can update firmware / driver by:

Promise Utility -> Check for updates and follow the prompts

If the above does not work, please log a call here:

https://support.promise.com/

Promise Pegasus 2 R4 - Can't Delete/Format Logical Volume

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