Replacing a Disk Module (Palm-Sized NVMe SSD) Used for the Data Pilot Service

Impact on the System

• If disk modules become faulty, the system reliability deteriorates.
• If disk modules become faulty, the system performance will decrease but data consistency is not affected.
• During disk module replacement, the system performance will decrease. Therefore, you are advised to replace disk modules during off-peak hours.

Prerequisites

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

Figure 1 Slot number of the disk module

Precautions

• To avoid data loss, only replace the disk modules whose alarm/location indicators are steady yellow.
• When removing a disk module, first remove it from its connector. Wait at least 10 seconds and then remove the disk module completely from the chassis.
• 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.
• To prevent system faults, do not replace disk modules with ones that have been used before.

• During the replacement of half-palm NVMe SSDs, complete the following operations within three minutes: Pull out the disk drawer, remove and insert disk modules, and reset the disk drawer. Otherwise, the heat dissipation of the storage device will be affected and the storage device will be powered off due to high temperature.
• If the replacement is not complete within 3 minutes, reset the disk drawer and wait for at least 10 minutes. After the node temperature returns to normal, open the disk drawer again. If the overtemperature indicator of a node is on, ensure that the disk drawer has been reset and wait until the overtemperature indicator turns off. Wait for 10 minutes until the node temperature returns to normal and open the disk drawer again.
  Figure 2 Over-temperature alarm indicator
  

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 3.

   Figure 3 Removing a front panel cover
   

2. Pull out the rear disk drawer.
   

   • Before pulling out a disk drawer, ensure that the signal cables connected to the device do not affect the pulling and pushing of the disk drawer.
   • Before pulling out a rear disk drawer, raise the handles on the front disk drawer until they are perpendicular to the front disk drawer.
   • To prevent the device from being powered off due to high temperature, reset the drawer within 3 minutes after the drawer is pulled out. Slide the drawer back immediately after the overtemperature indicator on the drawer panel turns on.
   • If the replacement is not complete within 3 minutes, reset the disk drawer and wait for at least 10 minutes. After the node temperature returns to normal, open the disk drawer again. If the overtemperature indicator of a node is on, ensure that the disk drawer has been reset and wait until the overtemperature indicator turns off. Wait for 10 minutes until the node temperature returns to normal and open the disk drawer again.
     Figure 4 Over-temperature alarm indicator
     
   Raise the handles on the front disk drawer until the handles are perpendicular to the drawer. Hold the handles on the rear disk drawer and slowly pull out the rear disk drawer. See (1) and (2) in Figure 5.

   Figure 5 Pulling out a rear disk drawer
   

3. Remove the faulty disk module.
   

   Correctly record the slots where disk modules reside.

   1. Press the release buttons on the protection board of disk modules to unlock the protection board. Then lift the protection board upwards. See (1) and (2) in Figure 6.
      Figure 6 Unlocking a protection board
      
   2. Press the ejector release button on the disk module. The ejector lever automatically ejects. See (1) in Figure 7.
      Figure 7 Removing a disk module
      
   3. Slowly pull out the disk module along the slot. See (2) in Figure 7.

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

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

   Raise the ejector lever of the disk module completely, push the disk module into the slot until it cannot move forward, and then reset the ejector lever. See (1) and (2) in Figure 8.

   Figure 8 Installing a disk module
   

7. 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.

8. Reset the protection board of disk modules.
   Press the protection board of disk modules to secure it to the system subrack. See Figure 9.

   Figure 9 Resetting a protection board
   

9. Reset the rear disk drawer.
   Raise the handles on the front disk drawer until the handles are perpendicular to the drawer. Pull the release buttons on both sides of the rear disk drawer upwards, push the rear disk drawer back into the system subrack, and pull down the handles on both front and rear disk drawers to their original positions. See (1), (2), and (3) in Figure 10.

   Figure 10 Resetting a rear disk drawer
   

10. 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. Ensure that the latch on the right of the front panel cover is secured to the system subrack. See (1) and (2) in Figure 11.

    Figure 11 Installing a front panel cover
    

Follow-up Procedure

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

If you want to continue using the replaced disk, format the disk to clear residual data. Otherwise, the data pilot service may be abnormal.