Thursday , June 13 2024

Replacing a Damaged Flash Disk(fmod) on Exadata

In case of a damage of the flash modules(fmod) on flash cards on Exadata cellnodes, the flash cache will not function normally and there will be performance problems.

Cellnodes include flash cards numbered 1, 2, 4 and 5. Each card has 4 fmod (flash disks). You can use the serial numbers to find the physically damaged flash disk.

You can change the flash disks by following following steps.

Find the Damaged Flash Disk

Make sure everything is OK. Because the server will be shut down, it is good to see that everything works fine before you shut down it.

Shut Down the Node

Before shut down, it is useful to make all the grid disks inactive.

Change fmod Physically

After the node is closed, replace the problematic fmod on the corresponding flash card. Always remove power cables before changing the hardware and use static electricity wristbands.

After the fmod change, insert the power cables and see the green light on the server flash, start the server from ilom or power button.

Perform the necessary checks after the change

Make sure that the serial number of the changed flash disk has changed.

Reactivate Grid Disks

Check Flash Cache

After you see that all grid disks are ONLINE, check the flash cache.

If the flashcache state is not normal after the flash disk change, drop flashcache, flashlog, and flashdisk drop and recreate in the same order.

Exadata X6 systems do not require this step. Since the sample process was done in the X2 system, the following steps were performed.

The sequence must be as follows.

Perform the Final Checks

You should see that Flash cache and flash disk status are normal.



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