QNAP Systems, Inc. - Network Attached Storage (NAS)

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Why are snapshots or snapshot replication jobs not working properly?
  1. Hardware limitations
    Snapshots are only supported on thick volumes, thin volumes and block-based LUNs. The NAS must be model x51 or above, with an Intel or AMD-based CPU and at least 4GB of memory.
    Each volume or LUN can support a maximum 256 snapshots, with a limit of 1024 snapshots for the whole NAS. For x51 NAS models, each volume or LUN can support up to 64 snapshots, with a limit of 256 snapshots for the whole NAS.
  2. Insufficient storage pool space
    Snapshots require free storage pool space. If there is insufficient space, delete unwanted snapshots. Setting snapshot reserved space to at least 10% may prevent this problem
  3. Insufficient memory or CPU resources
    If someone is accessing data on the volume or LUN, or if the NAS CPU and memory usage is too high (over 90%), snapshots may temporarily fail. Wait until the NAS is under less load or disable resource-intensive applications before continuing to use snapshots.
  4. Insufficient resources on destination NAS
    When using snapshot replica, both source and destination NAS must have sufficient space, CPU resources and memory for a snapshot to be taken and replicated. Check resources on both source and destination NAS if a replication job fails.
  5. Source volume or LUN was expanded
    When using snapshot replica, the source volume or LUN is replicated to the remote NAS as a base copy. If the source volume or LUN is then expanded, the copy on the remote NAS will not be able to store new snapshots. After expanding a volume or LUN, delete the snapshot vault on the target NAS and create a new replication job.
  6. Network ports are being blocked
    Snapshot replica uses SSH port 22 and bbcp data ports 50000 to 62700. Ensure that these ports are not being blocked.
Release date: 2016-08-30
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