Other Mobius Oyen 2 disk array fails to mount

Attached a 2 disk Mobius Raid 0+1 array to a freebsd freenas mini xl. The device shows as: /dev/da0 and /dev/da0p1. Issuing the command sudo mount -t ext2fs /dev/da0p1 /mnt/bkup/ix1/dphurst/mobius fails with the message
Code:
mount: /dev/da0p1: Invalid argument
, however sudo fstyp /dev/da0p1 results in
Code:
ext2fs
.

dmesg for that device when connected via USB shows:
Code:
umass0 on uhub1
umass0: <MSC Bulk-Only Transfer> on usbus0
umass0:  SCSI over Bulk-Only; quirks = 0x8100
umass0:17:0: Attached to scbus17
da0 at umass-sim0 bus 0 scbus17 target 0 lun 0
da0: < Mobius RAID1 > Fixed Direct Access SPC-4 SCSI device
da0: Serial Number RANDOM7067CDEBB6A0
da0: 40.000MB/s transfers
da0: 7630848MB (15627976704 512 byte sectors)
da0: quirks=0x2<NO_6_BYTE>

Later when trying to mount the device this message was produced:
Code:
WARNING: R/W mount of da0p1 denied due to unsupported optional features: dir_nlink 
ext2fs: da0: wrong magic number 0x42 (expected 0xef53)

Thanks for your advice!
Dow
 
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