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  • [7.0.0-beta.1] Some RaidZ2 Pool disks spinning down at different times

    Espressomatic

    By Espressomatic

      • Closed

    Issue Description

    As I understand it, a ZFS pool must have all its disks spun up when in use. Likewise, when not in use, all disks can be spun down.

     

    While using Unbalanced to move data to a ZRAID2 6-drive pool (single VDEV), while doing its discovery/check process, I noticed 3 disks in the UI marked as spun down. They sat like this for a couple of minutes as I waited to see if the other 3 would spin down. I spun them back up manually using the dot/circle next to the drive labels in the Main tab.

     

    As I'm writing this post, I notice those 3 disks are still spun up, but the other three disks are now spun down.

     

    image.thumb.png.45535426337d0f4f74e0dcfaf0a739de.png

     

    Expectation

     

    Spinning up and down of the pool looks like it allows the disks to get out of sync. I understand the need/desire for staggered spin-up, but I expected the sequence within a pool to be managed tightly - and for spin-down no staggering.


    The WebUI allows disks within a single VDEV RaidZ2 to be spun up/down individually as mentioned, and this seems counter intuitive and that it might possibly lead to issues. I'd expect the entire pool to have a single spin up/down control and Unraid to take care of the staggering sequence automatically.

     

    image.thumb.png.e533e5f4264fb0ec3175deef93c57dba.png

     

    Testing

    This has been more observation than testing, as described above.

     

    I have a general 30 minute spin-down delay in the Unraid settings as I have had for years.

     

     

    Go to reports Prereleases

    User Feedback

    Recommended Comments

    JorgeB

    This can happen if just some metadata is read from the pool, it doesn't need all the disks for that, so those disks can spin down later, or spin up alone.

    • Upvote 1
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  • Status Definitions

     

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