Dahua ESS2016X User Manual
Also see for ESS2016X: User manual
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Contents
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ESS Series User’s Manual1037 Appendix B--- Disk Hot Swap OperationThe hot swap operation means you can remove disk without shut down the system and unplugthe power cable. It enhances the system recovery capability and has sound expansibility andflexibility.The hot swap has the following situations:When the disk is free, hot swap operation will not result in system damage.When the disk is working, hot swap operation will not result in system malfunction, data loss (orcan resume data).Hot swap-Remove diskThere are two situations: remove the damaged disk/remove current working disk. Remove the damaged disk: You can remove from the rack directly. The data isdamaged since the disk is malfunction. Remove the properly working disk: You need to meet the following conditions ifyou want to remove the disk without the risk of data loss.Usually we do not recommend hot swap operation when system is running properly andthere is no damaged disk. The hot swap disk shall be set as RAID6/RAID5/RAID1. The hot swap disk group shall be in working status. RAID5 and RAID 6 can only hot swap (add/remove) one disk, RAID6 can onlyhot swap (add/remove) two disks. After the hot swap operation, the RAID statusbecomes degrading and one more hot swap operation will result in data loss ofthe whole group!Hot swap-Add diskCaution The operation here just follows the remove disk in the previous paragraphs. You can only add a disk after you remove one disk from the same RAID group. It is toguarantee data security.You can only add disk to the degrading RAID6/RAID5/RAID1 group. After the add operation,RAID status becomes ready. Its status becomes working after the synchronization operation. |
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