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Determine FlashGrid names of the disks to be removed, e.g. myhostname.lun3 or myhostname.lun4:
[fg@myhostname ~]$ flashgrid-node
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If the disks are members of an ASM disk group then drop them from the disk group. Example:
SQL> alter diskgroup MYDG drop disk MYHOSTNAME$LUN3 drop disk MYHOSTNAME$LUN4 rebalance wait;
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Prepare the disks for removal. Example:
[fg@myhostname ~]$ flashgrid-node stop-target /dev/flashgrid/myhostname.lun3 [fg@myhostname ~]$ flashgrid-node stop-target /dev/flashgrid/myhostname.lun4
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Detach the disks from the VM.