Adding disks for use in ASM (FlashGrid Server on GCP)

When adding new disks, make sure that each disk group has disks of the same size.

1. Create a new disk for the VM on CLI and then attach it using --device-name=shared-NN according to your environment. These disks will be shared automatically by FlashGrid Storage Fabric. Example:

   gcloud compute disks create mydbserver-5c9d98fc-shared-7 --size 40 --type hyperdisk-balanced --zone us-central1-a
   gcloud compute disks create mydbserver-5c9d98fc-shared-8 --size 40 --type hyperdisk-balanced --zone us-central1-a
   gcloud compute instances attach-disk mydbserver-5c9d98fc --disk=mydbserver-5c9d98fc-shared-7 --device-name=shared-7 --zone us-central1-a
   gcloud compute instances attach-disk mydbserver-5c9d98fc --disk=mydbserver-5c9d98fc-shared-8 --device-name=shared-8 --zone us-central1-a

2. Confirm FlashGrid names of the new drives, e.g. mydbserver.shared-7, mydbserver.shared-8

   [fg@mydbserver ~]$ flashgrid-node

   If the new drives are not listed then check that the corresponding devices (e.g. /dev/shared-7 and /dev/shared-8) are visible in the OS.
   
   If they are visible in the OS then, as the root user, run flashgrid-node reload-config and check the output of flashgrid-node again.
   
   If they are not visible in the OS or they appear with a different name, then double-check that you have attached them to the correct device name. 

3. Add the new disks to an existing disk group (or create a new disk group). Example:

   [fg@mydbserver ~]$ flashgrid-dg add-disks -G MYDG -d /dev/flashgrid/mydbserver.shared-[7-8]