Impact of disk reconstruction on services


Disk reconstruction consumes enormous CPU and memory resources and interrupts ongoing services. In this case, maintaining services is the priority.

Other related questions:
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.

Problem and solution when the hot spare disk does not replace the faulty disk (without reconstruction)
You can perform the following operations when the hot spare disk does not replace the faulty disk (without reconstruction): 1. Fault location and rectification a. When RAID 5 is configured, only one disk is allowed to be faulty in a disk domain at a time. If two disks are faulty, the RAID group fails. b. The operations such as reconstruction, copyback, and precopy can only be performed in specified scenarios. 2. Solution a. The failure is caused by a faulty RAID group. If one disk in a RAID group is faulty, a hot spare disk is automatically related to the faulty disk (run the CLI commandshowdisk -l to check and find that the status of the hot spare disk is used). The faulty disk starts reconstruction. During reconstruction, if another disk in the RAID group becomes faulty, the RAID group fails. The hot spare disk being used changes to free spare. Solution Recover the failed RAID group by referring to Troubleshooting RAID Group Failures. b. Precopy and reconstruction cannot be performed simultaneously. In present storage devices, only one disk can perform reconstruction (copyback and precopy) at one time. Disk reconstruction must be performed through serial processing regardless of RAID groups. Only two types of operations of different RAID groups can be processed concurrently, such as reconstruction and precopy, reconstruction and copyback, or copyback and precopy.

Impact of removing and installing hard disks without powering off the server
1. LSISAS2208 RAID controller card: If no hot spare disk is configured, the RAID controller card can rebuild data on a new hard disk installed online to replace a faulty hard disk. (The new hard disk must be of the same specifications as the faulty hard disk.) However, if you remove and reinstall a hard disk that is not faulty, the LSISAS2208 RAID controller cannot identify the data on the hard disk. 2. LSISAS2308 RAID controller card: If you remove and install a hard disk without stopping services, the LSISAS2308 RAID controller card can identify data on the hard disk no matter whether the hard disk is new or not.

Whether the USG6000 series hard disks are hot swappable
Hard disk unit SM-HDD-SAS300G-A is installed on the USG6000 (3 U device). The hard disk combination SM-HDD-SAS300G-A consists of the hard disk and hard disk tray. Hard disk combination SM-HDD-SAS300G-B is installed on the USG6000 (1 U device). The hard disk combination SM-HDD-SAS300G-B consists of the hard disk card and hard disk unit SM-HDD-SAS300G-A. Hard disk unit SM-HDD-SAS300G-A is hot-swappable, but the hard disk card is not.

Does InfoScanner Have Impact on Service Performance?
InfoScanner affects read/write performance of the system. You are advised to configure scan policies for scan directories based on current service requirements.

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