What is the rebuild machanism of ND8401/ND8301?

1. When will the ND8401/ND8301 do rebuild?
2. Can we cancel the rebuild function?
3. Is there any work around to avoid rebuild?

1. When will the ND8401/ND8301 do rebuild?
    If ND8401/ND8301 is powered off abnormally, it will do rebuild when next power on.

2. Can we cancel the rebuild function?
    No, we can't. The rebuild mechanism is defined in hardware level.
    What our software can do is to stop the VAST service during rebuild.

3. Is there any work around to avoid rebuild?
    If you use RAID 5, we suggest to use UPS to stablize the power.
    If the period of abnormal powered-off is longer than what UPS can support, please buy the UPS which can support to powered off the server automatically.
    Hence, ND8401/ND8301 won't do rebuild when next power on.