Cannot initialize disk due to ZFS label and clearing block offset 31 does resolve the issue
Article ID: 100026084
Updated On:
Description
Error Message
# /etc/vx/bin/vxdisksetup -ir c1t1d0
VxVM vxdisksetup ERROR V-5-2-5716 Disk c1t1d0s2 is in use by ZFS. Slice(s) 2 are in use as ZFS zpool (or former) devices.
If you still want to initialize this device for VxVM use, please destroy the zpool by running 'zpool' command if it is still active, and then remove the ZFS signature from each of these slice(s) as follows:
dd if=/dev/zero of=/dev/vx/rdmp/c1t1d0s[n] oseek=31 bs=512 count=1
[n] is the slice number. The above indicates that VM is detecting a ZFS signature on slice 2:
# dd if=/dev/zero of=/dev/vx/rdmp/c1t1d0s2 oseek=31 bs=512 count=1
Try with slices visible in prtvtoc and also without any slice as well.
# dd if=/dev/zero of=/dev/vx/rdmp/c1t1d0s0 oseek=31 bs=512 count=1
# dd if=/dev/zero of=/dev/vx/rdmp/c1t1d0 oseek=31 bs=512 count=1
Cause
If running the recommended DD command correct the condition and the disk remains unable to initialize then the ZFS label is not at the expected offset.
Resolution
In cases where the ZFS label is not at the expected offset a more general wipe operation will be required to ensure that the ZFS label is removed and the disk can be initialized.
Before proceeding, review and ensure the disk is not in use in any other capacity -- the following procedure will irrecoverably destroy the VTOC and any data in the beginning of the disk.
1. Zero out the first 72MB of the device
# dd if=/dev/zero of=/dev/vx/rdmp/c1t1d0s2 bs=1024 count=72000
2. Relabel the device (the VTOC is removed as part of this operation)
# format c1t1d0format> label Ready to label disk, continue? y # vxdctl enableApplies To
Following attempt to clear using the recommended DD command, the error condition persists.
Issue/Introduction
