Hardware Alert: Could not sync the following change in disk state with Cellsrv: Lost LUNs

Asset ID:	1-72-1304656.1
Update Date:	2011-03-31
Keywords:

Solution Type Problem Resolution Sure

Solution 1304656.1 : Hardware Alert: Could not sync the following change in disk state with Cellsrv: Lost LUNs

Applies to:

Exadata Database Machine X2-2 Full Rack - Version: Not Applicable and later [Release: N/A and later ]
Information in this document applies to any platform.

Symptoms

Receiving a Hardware Alert: CRITICAL,Could not sync the following change in disk state.

Changes

None.

Cause

Known Riser issue.

Sun hardware unpublished BUG: 6997590

No fix is available yet. But there is a workaround.

Solution

The impact of this problem on the operation of the machine as a whole is minimal. It is recommended to workaround this problem when it occurs as soon as it is convenient for the customer to do so.

Schedule a suitable time to reboot the cell server

NOTE: You can reboot the cell server wihtout any interruption to the operation of the RAC nodes. However, this introduces a risk of crashing the cluster IF another failure occurs on another cell server that happens to be the mirror partner of the server you are rebooting.

If any FMOD on these cards was in use at the time of the riser disappearing, it may have alerts and status "poor performance" rather than "not present" after the reboot.

To overcome this situation for any FMOD LUN in this state, force a "re-enable" on the flash cache LUNs back into the configuration using the following commands from cellcli interface:

CellCLI> alter lun <flashlunname> reenable force

for each lun that is marked as "poor performance" in output from the above 'list physicaldisk' command.
Then drop and re-create the flash cache:



 CellCLI> drop celldisk all flashdisk force

 CellCLI> create celldisk all flashdisk

 CellCLI> create flashcache all

The system will be back online automatically immediately after rebooting is completed.

References

<BUG:6997590> - X4270 EXADATA DATA CELLS LOSING PAIRS OF AURA 1.0 FLASH CARDS AT THE SAME TIME DURING PRODUCTION.

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