Solution when a RAID group is abnormal

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Check the event information on ISM and determine the reason why the RAID group is degraded due to disk failures.
Bit error isolation
Note: Check whether there are events indicating excessive bit errors related to the disk. If yes, the disk may be isolated due to excessive bit errors.

Troubleshooting: Analyze the SES log and determine why there are excessive bit errors.
Disk fault
Note: The disk fault cannot be rectified. As a result, accessing the disk fails and disk rejection occurs.

Troubleshooting: Replace the faulty disk.
Disk enclosures are offline.
Note: If a RAID group consists of disks from different enclosures and disk enclosures are offline, the RAID group will be degraded or fail.

Recommended action: Check whether the disk enclosures are offline.

Other related questions:
Problem and solution when the OSPF status is abnormal
To solve the problem that the OSPF status between the firewall and the peer device cannot reach the Full state, perform the following steps: 1. Check the OSPF status. Check whether the OSPF neighboring relationship can be established between the firewall and the peer device. 2. If no, check the security policy configuration. Check whether the security policy control function for unicast packets is enabled. That is, check whether the firewall packet-filter basic-protocol enable command is configured. If yes, run the undo firewall packet-filter basic-protocol enable command to disable the function. To establish an OSPF neighboring relationship, devices need to exchange DD packets. DD packets are OSPF unicast packets. By default, the forwarding of OSPF unicast packets is not controlled by security policies. However, if you run the firewall packet-filter basic-protocol enable command to enable the security policy control function for OSPF unicast packets, you need also to configure the corresponding security policy to allow the packets to be forwarded. For details, see OSPF can not step into full state caused by security policy deny.

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.

Solution when abnormal Fibre Channel connections occur
Symptom 1: On the ISM GUI, a message is displayed indicating that the initiator is not connected or the port is offline. Possible cause: The networking is incorrect. The optical cable or optical module is faulty. Recommended action: Check whether the optical module, optical cable, and networking are correct. Check whether the optical module and optical cable are inserted properly. Check whether abnormal port information is displayed. Check whether the logical connection is faulty. Symptom 2: The networking and hardware is normal. However, on the ISM GUI, a message is still displayed indicating that the initiator is not connected and the port is offline. Possible causes: Configuration problem: The rate, port mode, and topology mode do not match. Host problem: The HBA card drive does not match and the HBA card is faulty. Recommended action: Check whether the rate, port mode, and topology mode are correct. View the message log and check whether there are intermittent disconnection.

Whether a RAID group can be created when the capacity of member disks is different
Whether a RAID group can be created when the capacity of member disks is different: Yes. Total capacity of a RAID group = Minimum capacity of member disks in a RAID group x Quantity of member disks Therefore, if disks with different capacity are selected as member disks in a RAID group, the storage space of member disks may be wasted. It is recommended that disks with the same capacity be selected to create a RAID group.

What is the impact for the VCN3000 to reconstruct the RAID group?
Reconstructing the RAID group will result in recording data loss. Please exercise caution when performing this operation. Cameras that have been added do not need to be added again.

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