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Determine FlashGrid names of the disks to be removed, e.g. myhostname.xvdbb or myhostname.xvdbc:
[fg@myhostname ~] $ flashgrid-node -
If the disks are members of an ASM disk group then drop the disks from the disk group. Example:
SQL> alter diskgroup MYDG drop disk MYHOSTNAME$XVDBB drop disk MYHOSTNAME$XVDBC rebalance wait;
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Prepare the disks for removal. Example:
[fg@myhostname ~] $ flashgrid-node stop-target /dev/flashgrid/myhostname.xvdbb [fg@myhostname ~] $ flashgrid-node stop-target /dev/flashgrid/myhostname.xvdbc
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Detach the EBS volumes from the AWS instance.