Unhealthy Pool - Cache

TrueNAS General
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1

In the last few months I upgraded to Truenas Scale. Sometime later I am getting:

root@truenas[~]# zpool status -x
pool: tank
state: ONLINE
status: One or more devices could not be used because the label is missing or
invalid. Sufficient replicas exist for the pool to continue
functioning in a degraded state.
action: Replace the device using ‘zpool replace’.
see: Message ID: ZFS-8000-4J — OpenZFS documentation
scan: scrub repaired 0B in 07:26:59 with 0 errors on Sun Mar 31 07:27:05 2024
config:

    NAME                                          STATE     READ WRITE CKSUM
    tank                                          ONLINE       0     0     0
      raidz2-0                                    ONLINE       0     0     0
        sdc2                                      ONLINE       0     0     0
        sda2                                      ONLINE       0     0     0
        sdd2                                      ONLINE       0     0     0
        sde2                                      ONLINE       0     0     0
        sdb2                                      ONLINE       0     0     0
    logs
      sdg1                                        ONLINE       0     0     0
    cache
      gptid/4c35231c-4715-11ec-8dfd-3cecef5ff440  UNAVAIL      0     0     0

being a complete ZFS noob I cannot figure out how to proceed. I have

Platform: TRUENAS-MINI-3.0-X+ Version:

TrueNAS-SCALE-23.10.2

Error message is:

Pool tank state is ONLINE: One or more devices could not be used because the label is missing or invalid. Sufficient replicas exist for the pool to continue functioning in a degraded state.

The following devices are not healthy:

  • Disk Micron_5300_MTFDDAK480TDS 21142E379201 is UNAVAIL

2024-04-05 10:04:52 (America/Los_Angeles)

Any guidance would be appreciated.

2

Also wanted to point out that no errors on SMART tests for that SSD.

3

Please put the SCALE tag as well in order to get targeted help. :slightly_smiling_face:

Apparently your cache drive has an issue, you need to replace it from the WebUI. I would try setting it offline then back online first.

4

OK - will try to find out how to offline it and online it. It seemed to resist because it was cache, but will try that - thanks.

5

You can just throw it out of the pool and add it again, a L2ARC drive does not endanger the pool’s status. If it’s a metadata vdev your pool design needs an imrovement (metadata VDEVs require the same amount of parity of the data VDEV).

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6

I remove and replaced it and it seems to be all green now. Not sure I understand what I did but all healthy.

7

Thanks sooo much for the guidance. That was tremendous.

8

Just do note that while this fixed the system’s complaint, it is not an indication that the issue is resolved: if it still gives you problems, you will need to troubleshoot. But if it’s a L2ARC drive you can be at ease since it does not endanger any data.

Additionally, you can select a user’s reply as the solution to your question: it should change the topic’s status to solved as well. End of educational segment :slightly_smiling_face:

4 Likes