Zpool offline vs detachment

images zpool offline vs detachment

This obviously requires that the array does not depend on the disk being replaced, hence the array must have redundancy; if it does depend on the drive in question, this approach presents the same problem as above. When a device is taken offline, it is not detached from the storage pool. After a detach lots of data may still be on the drive, but it will be practically impossible to remount the drive and view the data as a usable filesystem. If you attempt to bring online a faulted device, a message similar to the following is displayed:. To temporarily take a device offline, use the zpool offline -t option. Hot Network Questions. The difference is that resilvering only examines data that ZFS knows to be out of date for example, when attaching a new device to a mirror or replacing an existing devicewhereas scrubbing examines all data to discover silent errors due to hardware faults or disk failure. For example: zpool offline -t tank c1t0d0 bringing device 'c1t0d0' offline When the system is rebooted, this device is automatically returned to the ONLINE state. When turning the drive notification light off on the chassis, be sure to use the same slot and chassis IDs as you did when enabling it.

  • Solaris ZFS How to Offline / Online / Detach / Replace device in a storage pool – The Geek Diary
  • zfs detach/replace
  • linux How to replace a disk in a nonredundant ZFS pool Unix & Linux Stack Exchange
  • Detach device from zpool
  • Understanding and Resolving ZFS Disk Failure

  • You can take a device offline by using the zpool offline command followed by the pool name and the device name.

    Solaris ZFS How to Offline / Online / Detach / Replace device in a storage pool – The Geek Diary

    In the code example in the slide, the c1t0d0. Attaching and Detaching Devices in a Storage Pool. In addition If you are replacing a disk in a ZFS root pool, see How to Replace a Disk in the ZFS Root Pool.

    ZFS allows individual devices to be taken offline or brought online. When hardware is When a device is taken offline, it is not detached from the storage pool.
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    zfs detach/replace

    Can you operate a second server onsite or even a 2nd ZFS array in the same server? Sign up using Facebook.

    images zpool offline vs detachment

    Answer updated. I've been doing a bit of reading, and it looks like ZFS doesn't like disks being removed from non-redundant arrays :.

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    images zpool offline vs detachment

    You can take a device offline by using the zpool offline command. In the same machine, have you tried creating a new pool with the 2 drives in a mirror? This scenario is possible assuming that the systems in question can detect the storage after it is attached to the new switches, possibly through different controllers than before, and your pools are set up as RAID-Z or mirrored configurations.

    By default, pool size is not expanded to its full size unless the autoexpand pool property is enabled. One thing to make note of is that checksum errors on individual drives, from time to time, is normal and expected behavior if not optimal.

    In my experimentation, if I first zpool offline a device and then zpool detach the same device, the rest of the pool forgets the device ever existed.

    linux How to replace a disk in a nonredundant ZFS pool Unix & Linux Stack Exchange

    Identify the FAULTED or UNAVAILBLE drive; zpool replace the drive in. Because of this, mirror members can be 'detached' where you would.

    Video: Zpool offline vs detachment Oracle Solaris IPMP

    "zpool detach" and "zpool replace" are two very different, and totally unconnectedthings. "zpool detach" is used to remove drives from mirror.
    It only takes a minute to sign up. In order to replace a drive in the same slot as the faulted drive, it must be removed from the pool and unconfigured from the OS before a new disk can be inserted.

    ChrisS instead of a -1 how about writing an answer with some citations.

    Detach device from zpool

    What I am suggesting is that you format the two backup drives with whatever file system you want, and using the zfs send command to take full or incremental backup streams saved to the backup disks, or use zfs recv to make a duplicate disk. With ZFS, they are not of much concern, but some degree of preventative maintenance is necessary to prevent a failure from accumulation. For added protection against detach you can even physically unplug the device after the offline command, yet prior to issuing the detach command.

    images zpool offline vs detachment
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    Understanding and Resolving ZFS Disk Failure

    To detach a device from a mirrored storage pool, you can use the zpool detach command. If the condition is not temporary, you can instruct ZFS to ignore the device by taking it offline.

    Replacement is much the same as with mirrors: single devices can be removed outright should they fail and new ones added.

    images zpool offline vs detachment

    Overall this is still a hackish approach and does introduce some risk, but has provided a reasonably safe and inexpensive offsite backup of our data. For example: zpool offline tank c1t0d0 bringing device c1t0d0 offline Consider the following points when taking a device offline: You cannot take a pool offline to the point where it becomes faulted.

    The device was physically removed while the system was running.

    3 thoughts on “Zpool offline vs detachment

    1. I've been doing a bit of reading, and it looks like ZFS doesn't like disks being removed from non-redundant arrays :. An in-progress spare replacement can be cancelled by detaching the hot spare.

    2. Can you operate a second server onsite or even a 2nd ZFS array in the same server? After a detach lots of data may still be on the drive, but it will be practically impossible to remount the drive and view the data as a usable filesystem.