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Shut down or reboot an Exadata storage cell without affecting ASM

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This article covers some of the DBMA Commands which will be useful while performing this scenario where we want to reboot the cell not due to some maintenance activity.

[1] Verify the existing disk_repair_time attribute for all diskgroups
SQL> select dg.name,a.value from 
v$asm_diskgroup dg, v$asm_attribute a 
where dg.group_number=a.group_number and
a.name='disk_repair_time';

[2] The default disk_repair_time is 3.6 hours only so better to adjust.
 SQL> ALTER DISKGROUP DATA SET ATTRIBUTE 'DISK_REPAIR_TIME'='8.5H';
[3] Next you will need to check if ASM will be OK if the grid disks go OFFLINE. 
The following command should return 'Yes' for the grid disks being listed:

cellcli -e list griddisk attributes name,asmmodestatus,asmdeactivationoutcome

Execute the command below and the output should show either 
asmmodestatus=OFFLINE or asmmodestatus=UNUSED and 
asmdeactivationoutcome=Yes for all griddisks once the disks are offline in ASM. 
Only then is it safe to proceed with shutting down or restarting the cell:

Note: Shutting down the cell services when one or more grid disks does not return 
asmdeactivationoutcome='Yes' will cause Oracle ASM to dismount the affected disk group, 
causing the databases to shut down abruptly.

[4] Inactivate all grid disks on the cell you wish to power down/reboot:
cellcli -e alter griddisk all inactive

[5] Confirm that the griddisks are now offline by performing the following actions:
cellcli -e list griddisk attributes name,asmmodestatus,asmdeactivationoutcome
cellcli -e list griddisk

Note:
Execute the command below and the output should show either asmmodestatus=OFFLINE or 
asmmodestatus=UNUSED and asmdeactivationoutcome=Yes for all griddisks once the disks are 
offline in ASM. Only then is it safe to proceed with shutting down or restarting the cell

[6] You can now reboot the cell.
#shutdown -h now

[7] Once the cell comes back online - you will need to reactive the griddisks:

cellcli -e alter griddisk all active

[8] Issue the command below and all disks should show 'active':

cellcli -e list griddisk

[9] Verify grid disk status: 

cellcli -e list griddisk attributes name, asmmodestatus
cellcli -e list griddisk attributes name where asmdeactivationoutcome != 'Yes'

Below are the some of the good article related to this topics.

For detail information,please refer MOS DOC ID 1188080.1 Steps to shut down or reboot an Exadata storage cell without affecting ASM.

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