I’m gonna follow these instructions to replace a disk in one of my ZFS arrays on my workstation ‘trick’. Have ordered myself a new 6TB Seagate Barracuda Hard Drive for $179. I hope nobody minds if I make a few notes for myself here…

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Mon Sep 12 19:24:53 [bash:5.0.17 jobs:0 error:0 time:179]
root@trick:/home/jj5
# zpool status data
  pool: data
 state: DEGRADED
status: One or more devices has experienced an unrecoverable error.  An
        attempt was made to correct the error.  Applications are unaffected.
action: Determine if the device needs to be replaced, and clear the errors
        using 'zpool clear' or replace the device with 'zpool replace'.
   see: http://zfsonlinux.org/msg/ZFS-8000-9P
  scan: scrub canceled on Mon Sep 12 19:24:53 2022
config:

        NAME                                     STATE     READ WRITE CKSUM
        data                                     DEGRADED     0     0     0
          mirror-0                               DEGRADED     0     0     0
            scsi-SATA_ST6000VN0041-2EL_ZA16N49H  DEGRADED 11.1K     0 54.6K  too many errors
            scsi-SATA_ST6000VN0041-2EL_ZA16N4ZH  ONLINE       0     0     0

errors: No known data errors

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Mon Sep 12 19:40:13 [bash:5.0.17 jobs:0 error:0 time:1099]
root@trick:/home/jj5
# zdb
data:
    version: 5000
    name: 'data'
    state: 0
    txg: 2685198
    pool_guid: 1339265133722772877
    errata: 0
    hostid: 727553668
    hostname: 'trick'
    com.delphix:has_per_vdev_zaps
    vdev_children: 1
    vdev_tree:
        type: 'root'
        id: 0
        guid: 1339265133722772877
        create_txg: 4
        children[0]:
            type: 'mirror'
            id: 0
            guid: 802431090802465148
            metaslab_array: 256
            metaslab_shift: 34
            ashift: 12
            asize: 6001160355840
            is_log: 0
            create_txg: 4
            com.delphix:vdev_zap_top: 129
            children[0]:
                type: 'disk'
                id: 0
                guid: 9301639020686187487
                path: '/dev/disk/by-id/scsi-SATA_ST6000VN0041-2EL_ZA16N49H-part1'
                devid: 'ata-ST6000VN0041-2EL11C_ZA16N49H-part1'
                phys_path: 'pci-0000:00:17.0-ata-3'
                whole_disk: 1
                DTL: 28906
                create_txg: 4
                com.delphix:vdev_zap_leaf: 130
                degraded: 1
                aux_state: 'err_exceeded'
            children[1]:
                type: 'disk'
                id: 1
                guid: 4734211194602915183
                path: '/dev/disk/by-id/scsi-SATA_ST6000VN0041-2EL_ZA16N4ZH-part1'
                devid: 'ata-ST6000VN0041-2EL11C_ZA16N4ZH-part1'
                phys_path: 'pci-0000:00:17.0-ata-4'
                whole_disk: 1
                DTL: 28905
                create_txg: 4
                com.delphix:vdev_zap_leaf: 131
    features_for_read:
        com.delphix:hole_birth
        com.delphix:embedded_data

I think the commands I’m gonna need are:

# zpool offline data 9301639020686187487
# zpool status data
# shutdown # and replace disk
# zpool replace data 9301639020686187487 /dev/disk/by-id/scsi-SATA_ST6000DM003-2CY1_WSB076SN
# zpool status data