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Paste from Pasty at Tue, 15 Mar 2016 16:13:31 +0000

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# /dev/sdj1 and /dev/sdk1 are both 3.0TB drives
# sdk was originally a zfs member drive in another system

# fstab is like this :

UUID=2dae7320-9871-4a1f-8f5b-10ea7cb39674       /media/3.0TB-A  xfs     noatime,defaults        0       2
UUID=22126f9a-db93-4b96-990f-c8846affbc3e       /media/3.0TB-B  xfs     noatime,defaults        0       2

root@backup:/media$ xfs_admin -ul /dev/sdj1
UUID = 2dae7320-9871-4a1f-8f5b-10ea7cb39674
label = "3.0TB-A"

root@backup:/media$ xfs_admin -ul /dev/sdk1
UUID = 22126f9a-db93-4b96-990f-c8846affbc3e
label = "3.0TB-B"

root@backup:/media$ mount /dev/sdk1 3.0TB-B
mount: /dev/sdk1: more filesystems detected. This should not happen,
       use -t <type> to explicitly specify the filesystem type or
       use wipefs(8) to clean up the device.
mount: you must specify the filesystem type

# with -t xfs mounts fine
root@backup:/media$ mount -t xfs /dev/sdk1 3.0TB-B

# blkid see nada for sdk1
root@backup:/media$ blkid /dev/sdk1

# but it sees sdj just fine
root@backup:/media$ blkid /dev/sdj1
/dev/sdj1: LABEL="3.0TB-A" UUID="2dae7320-9871-4a1f-8f5b-10ea7cb39674" TYPE="xfs" 

# lsblk -f output
root@backup:/media$ lsblk -f

sdj
└─sdj1  xfs               3.0TB-A  /media/3.0TB-A
sdk                                
└─sdk1                             /media/3.0TB-B
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