Replacing a Main Storage Disk Module (OceanStor Pacific 9920 Palm-sized NVMe SSD 25-Slot)

Impact on the System

• If main storage disk modules are faulty, the system performance will decrease but data consistency is not affected.
• During the replacement of main storage disk modules, the system performance will decrease. Therefore, you are advised to replace main storage disk modules during off-peak hours.
• During the replacement of main storage disk modules, the data durability decreases during data reconstruction. After the reconstruction is complete, the data durability recovers.

Prerequisites

• The replacement main storage disk module (spare part) has been prepared.
• The faulty main storage disk module has been located.
• The disk pool to which the faulty main storage disk module belongs is in the normal or degraded state, and no data reconstruction task is running.

Precautions

• If a cache disk module and its corresponding main storage disk modules are faulty at the same time, you must replace the cache disk module first.
• To avoid data loss, only replace the disk modules whose alarm/location indicators are steady yellow.
• To prevent system faults, do not replace disk modules with ones that have been used before.
• To prevent system faults, do not change the location of a disk that is being used in a storage pool.
• To prevent replacement failures, ensure that replacement disk modules are free from obvious foreign objects, collision, and scratches.
• To prevent replacement failures, ensure that the disk slots are free from foreign objects or obvious damage before installing disk modules.
• To prevent system faults, use the BOM code of the faulty disk module to apply for a replacement disk module.
• To avoid damaging disk modules and connectors, remove and install disk modules with even force.
• After inserting a disk module, wait at least 30 seconds before removing it to prevent damage to the disk module.

When replacing a main storage disk module, ensure that the time from removing the main storage disk module to installing a new main storage disk module into the node does not exceed three minutes. Otherwise, the heat dissipation of the storage device will be affected and the system will be faulty.

Tools and Materials

• ESD gloves
• ESD wrist strap
• ESD bag
• Labels

Procedure

1. Remove the front panel cover.

   Press the release button on the right of the front panel cover, tilt the front panel cover by 20° to 30° forward, and move the front panel cover rightward to separate it from the groove on the left of the system subrack. Then, remove the front panel cover. See (1), (2), and (3) in Figure 1.

   Figure 1 Removing a front panel cover
   

2. Remove the disk module.
   

   • When removing disk modules, correctly record the slots where disk modules reside.
   • The time from disk module removal to installation and restoration cannot exceed three minutes. Otherwise, the system will be faulty due to overtemperature.
   1. Press the ejector release button on the disk module. The ejector lever automatically ejects. See (1) in Figure 2.
      Figure 2 Removing a disk module
      
   2. Hold the ejector lever of the disk module and pull out the disk module slowly. See (2) and (3) in Figure 2.

3. Put the removed disk module into an ESD bag.
4. Take the replacement disk module out of its ESD bag.
5. Install the disk module.
   

   Ensure that disk modules are inserted into the same slots before and after the replacement. Otherwise, services may be affected.

   1. Open the ejector lever completely and push the disk module into the node along the slot until it cannot move forward. See (1) in Figure 3.
      Figure 3 Installing a disk module
      
   2. Close the ejector lever of the disk module to push the disk module into the node with the force between the ejector lever and the node. See (2) in Figure 3.

6. Check the installation.

   After inserting the disk module, wait 5 seconds and then check the disk module running indicator to determine whether the disk module has been successfully installed.

   If the disk module running indicator is steady green, the disk module is successfully installed. In this case, go to the next step. Otherwise, the disk module fails to be installed and you need to perform the following operations to restore the installation:

   1. Check whether the disk module has been firmly inserted. If not, wait 30 seconds and reinsert it.
   2. If the disk module still fails to be installed after you reinsert it, the link of the disk slot may be faulty. In this case, contact technical support.

7. Install the front panel cover.
   Align the latch on the left of the front panel cover with the groove on the left of the system subrack, and push the right of the front panel cover forward until you hear a click. Ensure that the front panel cover is fully secured to the system subrack. See (1) and (2) in Figure 4.

   Figure 4 Installing a front panel cover
   

Follow-up Procedure

After the main storage disk module is replaced, label it to facilitate subsequent operations.