Replacing Online Cache Disk Modules

Impact on the System

If the system has heavy service loads, the replacement will increase the service response time. Therefore, perform the replacement during off-peak hours.

Prerequisites

• A spare cache disk module has been prepared.
• The cache disk module to be replaced has been located.
• The storage pool to which the cache disk module to be replaced belongs is in the normal state and has no running data reconstruction task.

• The vendor and type of the spare cache disk module are the same as those of the faulty cache disk module.
• The capacity of the spare cache disk module is greater than or equal to that of the cache disk module to be replaced.

Precautions

• During the replacement of cache disk modules, complete the following operations within three minutes: Pull out the disk drawer, remove and insert cache disk modules, and put the disk drawer back where it was. Otherwise, the heat dissipation of the storage device will be affected and the system will be overheated.
• To prevent replacement failures, ensure that the spare 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 spare cache disk module.
• When replacing a cache disk module, wait 10 seconds after it is removed before you install a new one.
• Remove cache disk modules in sequence. Remove one cache disk module completely before removing another.
• Insert cache disk modules in sequence. Insert a cache disk module completely before inserting another.

Recommended Tools

• ESD gloves
• ESD wrist straps
• ESD bags
• Labels

Procedure

1. Remove a faulty disk module.
   

   When removing disk modules, correctly record the slots where disk modules reside.

   1. Press the ejector release button on the disk module and the ejector lever automatically ejects, as shown in step ① in Figure 1.
      Figure 1 Removing a disk module
      
   2. Hold the ejector lever of the disk module and pull out the disk module slowly, as shown in steps ② and ③ in Figure 1.
2. Put the removed disk module into an ESD bag.
3. Take the spare disk module out of its ESD bag.
4. Install the spare disk module.
   

   Install disk modules into the same slot 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, as shown in step ① in Figure 2.
      Figure 2 Installing a disk module
      
   2. Close the ejector lever of the disk module so that the disk module is secured to the node, as shown in step ② in Figure 2.
5. Check whether the installation is successful.

   After inserting the cache disk module, wait 30 seconds and then check the cache disk module running indicator to determine whether the cache disk module has been successfully installed.

   If the running indicator of the cache disk module is steady green, the cache disk module is successfully installed. Otherwise, the cache disk module fails to be installed and you need to perform the following operations:

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