Replacing an Online Cache Disk Module (OceanStor Pacific 9520 14- or 16-Slot)

Impact on the System

• If a cache disk module is faulty, the system performance decreases by 30% to 35% but data consistency is not affected.
• During the replacement of a cache disk module, the system performance will decrease. Therefore, you are advised to replace a cache disk module during off-peak hours.
• During the replacement of a cache disk module, the data durability decreases during data reconstruction. After the reconstruction is complete, the data durability recovers.

Prerequisites

• The replacement disk module (spare part) has been prepared.
• The faulty disk module has been located.

Precautions

• To prevent replacement failures, ensure that the replacement cache disk module is free from obvious foreign objects, collision, and scratches.
• To prevent replacement failures, ensure that the cache disk slot is free from foreign objects or obvious damage before installing the replacement cache disk module.
• When replacing a cache disk module, wait 10 seconds after it is removed before you install a new one.
• To prevent system faults, use the BOM code of the faulty disk module to apply for a replacement disk module.
• Remove cache disk modules in sequence. Remove one cache disk module completely before removing another.
• Install cache disk modules in sequence. Install one cache disk module completely before installing another.
• A node can remain in maintenance mode for 45 minutes. After that, you need to manually switch the node to the maintenance mode again.

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 cache disk module into an ESD bag.
4. Take the replacement cache 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 whether the replacement disk module is successfully installed.

   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 on, 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 cache disk module is replaced, label it to facilitate subsequent operations.