Possible causes of RAID group exceptions

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RAID group exceptions include RAID group degrade and RAID group failure. The root cause of the RAID group exceptions are disk failures. The possible causes are as follows: bit error isolation, disk faults, and enclosure offline (a RAID group consisting of disks from different enclosures). When the RAID group is degraded, if the system has idle or hot spare disks, the system automatically starts reconstruction and reconstructs the data in the faulty disk to the hot spare disk. Performance may be deteriorated during the reconstruction. If the disk is reconstructed, reduce the service pressure of the reconstructed RAID group if possible, so that the reconstruction can be completed as soon as possible.

Other related questions:
RAID group
The definition of a RAID group is as follows: A single physical disk cannot meet requirements of a large amount of data storage and data security. A RAID group serves as a large logical disk that comprises independent physical disks of the different RAID levels, providing larger storage space. Different RAID levels meet data security requirements in different application scenarios.

Possible causes of an OSNR decrease
The possible causes are as follows: Possible cause 1: Any fiber pigtail in a multiplexing part or the optical cable degrades or is physically damaged. As a result, the attenuation of the fiber increases, and the receive optical power decline causes an OSNR decrease. Possible cause 2: The OA board gain at the local or peer site is decreased.

Possible causes for an IPv6 address conflict on an interface
In V100R002 and later versions, an IPv6 address conflict on an interface may be caused by the following - The peer interface directly connected to this interface has been configured with the same IPv6 address as that of the interface. - After the internal loopback detection function is enabled on an Ethernet interface, the IPv6 link-local address status of the interface is DUPLICATE, and the IPv6 global unicast address status of the interface is TENTATIVE (the address is a tentative address and have not passed the duplicate address detection). You can run the undo loopback command in the Ethernet interface view to disable the loopback detection mode on the interface. - There is a loop on the network. Note: By default, a switch performs duplicate address detection after an IPv6 address is configured for an interface on the switch. You can run the display ipv6 interface interface-type interface-number command in any view to check whether the IPv6 address of an interface conflicts with another IPv6 address.

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