Whether it is possible to replace a single faulty slot of a subrack

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Currently, it is impossible to replace a single faulty slot of a subrack. If a slot is faulty, you are advised to move the board to another slot or replace the entire subrack.

Other related questions:
Replacing hard disks for the USG6000 series
If a hard disk is faulty (for example, a hard disk failure log is generated on the USG), you can replace the hard disk unit. The hard disk unit can be replaced no matter when the device is powered on or off. If the device is powered off, skip step 1 and do not run the disk offline command. The following procedure guides you through hard disk unit replacement while the device is powered on: Note: In case of dual hard disks, replace the faulty disk with a new one. Do not change slots of the hard disks. Otherwise, the device may fail to recognize the hard disks. After replacing the hard disk, run the disk online command in the system view. Otherwise, the hard disk does not work. For dual hard disks, data is automatically synchronized between the hard disks after the disk online command is run. The synchronization takes several hours. During the synchronization, do not insert or remove the hard disks. Otherwise, data loss may occur. 1. Ensure that all configurations are saved. 2. Run the disk offline command in the system view. Wait for about 30 seconds until the system indicates that the hard disk stops working and then remove the hard disk unit to be replaced. a. Press the button on the right of the hard disk tray to eject the handler. b. Use the handler to pull the hard disk unit out of the slot. c. Put the replaced hard disk unit into an ESD bag. 3. Install the new hard disk unit. The hard disk unit installation methods are the same for 1 U and 3 U devices. For details, see content relevant to installing hard disks for the USG6000 series in the product documentation. 4. Run the disk online command and then the display disk information command in the system view. If Filesystem Status is Mounted, the hard disk works properly. Note: For dual hard disks, Filesystem Status becomes Mounted several hours after the disk online command is run. During this period, you can use other services, but the hard disks do not record real-time logs for these services. After data synchronization completes, the hard disks automatically start to work. You can run the display disk information command in the user view on the next day to check whether Filesystem Status is Mounted. If no, contact Huawei technical support personnel.

Whether SCC replacement in a slave subrack affects services
If SCC 1+1 protection has been configured, SCC replacement in a slave subrack has no impact on the system. If SCC 1+1 protection has not been configured, the following impact may be present before the newly configured SCC restarts from the reset triggered during board replacement: 1. The fan speed mode is changed from Auto speed mode to High Speed mode. 2. The ESC or OSC communication of the slave subrack fails. 3. The POWER_FAIL alarm in the slave subrack cannot be reported. 4. Subrack ID conflicts with the ID of the slave subrack cannot be detected. 5. In the slave subrack, some optical-layer boards go offline and cannot be managed, but services are not affected.

Meanings of the slot IDs on an OSN 3500 subrack
Question: What are the meanings of the slot IDs on an OSN 3500 subrack? Answer: Numbers 1 to 16 are slot IDs of boards in the master subrack, and 51 to 66 are slot IDs of boards in the extended subrack. Numbers 17 and 18 are slot IDs for system control boards, and 19/69 to 37/87 are slot IDs for interface boards.

Whether database restoration is required when the SCC board in a slave subrack is replaced
No. Database restoration is not required when the SCC board in a slave subrack is replaced.

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