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Full Discussion: How to clear a removed single-disk pool from being listed by zpool import?
Operating Systems Solaris How to clear a removed single-disk pool from being listed by zpool import? Post 303021529 by priyadarshan on Sunday 12th of August 2018 03:36:43 AM
Old 08-12-2018
Thank you very much @hicksd8 and @Peasant for suggestions.

Unfortunately, both # zpool clear fido and
zpool export fido; devfsadm -Cv

did not help, I'm still getting same ghost entry with zpool import, same as first post.

I think that's because the single-device pool named "fido" isn't attached, and thus zpool commands won't be able to affect it.

I also tried zpool labelclear -f fido, but it doesn't work, I believe for same reason.

Last night I wondered, if the disk isn't even attached, where does zpool import get that ghost information?

I digged further with the zdb command, which revealed this "label" on disk c1t0025385971B16535d0, which is the server's boot disk:

Code:
# zdb -l /dev/rdsk/c1t0025385971B16535d0
------------------------------------
LABEL 0
------------------------------------
failed to unpack label 0
------------------------------------
LABEL 1
------------------------------------
failed to unpack label 1
------------------------------------
LABEL 2
------------------------------------
    version: 5000
    name: 'fido'
    state: 0
    txg: 30770
    pool_guid: 7452075738474086658
    hostid: 647188743
    hostname: ''
    top_guid: 7525102254531229074
    guid: 7525102254531229074
    vdev_children: 1
    vdev_tree:
        type: 'disk'
        id: 0
        guid: 7525102254531229074
        path: '/dev/nvd0p3'
        whole_disk: 1
        metaslab_array: 37
        metaslab_shift: 32
        ashift: 12
        asize: 509746872320
        is_log: 0
        create_txg: 4
    features_for_read:
        com.delphix:hole_birth
        com.delphix:embedded_data
------------------------------------
LABEL 3
------------------------------------
failed to unpack label 3

So, zpool import seems to read that stray information on the boot disk, related to a long-gone pool, and still believe it is available on the system.

One solution would be to perform a complete reinstall on that machine, wiping boot disk completely with dd before install.

Before doing that, would you know if it's possible at all to safely clear up such a stray zdb entry from a boot disk?
Last edited by priyadarshan; 08-12-2018 at 04:50 AM..
 

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