Replacing a Main Storage Disk Module (2 U/4 U x86 Hardware or 2 U/4 U Kunpeng Hardware)

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 removing a disk module, first remove it from its connector. Wait at least 30 seconds and then remove the disk module completely from the chassis.
• SSDs and HDDs (including NL-SAS, SAS, and SATA disks) cannot be preserved for a long time after being powered off.
  • SSDs with no data stored can be preserved for a maximum of 12 months while they are powered off. SSDs with data stored can be preserved for a maximum of 3 months while they are powered off. Exceeding the maximum preservation time may cause data loss or SSD failure.
  • Packed HDDs can be preserved for a maximum of 6 months. Unpacked HDDs that are powered off can also be preserved for a maximum of 6 months. Exceeding the maximum preservation time may cause data loss or HDD failure.
  • The maximum preservation time is determined based on the disk preservation specifications provided by disk vendors. For details, see the manuals provided by the disk vendors.

Tools and Materials

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

Procedure

1. Remove the disk module.
   

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

   1. Press the ejector release button on the disk module. The ejector lever automatically ejects. See (1) in Figure 1.
      Figure 1 Removing a disk module
      
   2. Hold the ejector lever, and pull out the disk module for approximately 3 cm. See (2) in Figure 1.
   3. Wait at least 30 seconds until the disk stops spinning, and then slowly pull out the disk module. See (3) in Figure 1.

2. Put the removed disk module into an ESD bag.
3. Take the replacement disk module out of its ESD bag.
4. 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 in along the guide rails until it cannot move forward. See (1) in Figure 2.
      Figure 2 Installing a disk module
      
   2. Ensure that the ejector lever is fastened to the chassis beam, and then close the ejector lever to completely insert the disk module into the chassis. See (2) in Figure 2.

5. Check the installation.
   Wait 3 minutes and then check the activity and fault indicators on the replacement disk module to determine whether the disk module is successfully installed.

   • If the activity indicator is steady on or blinking green and the fault indicator is off or blinking yellow, the installation is successful.
   • If the fault indicator is steady yellow, the installation fails. In this case, perform the following operations:
     • Check whether the disk module has been firmly inserted. If not, wait 30 seconds and reinsert it.
     • If the fault indicator is still steady yellow after you reinsert the replacement disk module, the replacement disk module may be faulty. In this case, replace it with another disk module.
     • If the fault indicator is still steady yellow after you replace the disk module, the link of the disk slot may be faulty. In this case, contact technical support.

Follow-up Procedure

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