How to migrate Elastifile EMS boot device to persistent ssd

When using the Elastifile Cloud File System advanced features, like - AsyncDR or Snapshot Backup, the load on EMS pd-standard may reach the pd i/o limit.

To solve the issue it is recommended to move the EMS instance to use PD-SSD.

When instructed, this procedure need to be performed online with Elastifile support.

First we need to populate all variables used during this KB. -

export EMS_INSTANCE_NAME=""

export GCP_PROJECT_ID=""

export GCP_REGION=""

export GCP_ZONE=""

export SNAPSHOT_NAME=$EMS_INSTANCE_NAME"-snapshot"

export DISK_NAME=$EMS_INSTANCE_NAME

EMS_INSTANCE_NAME = Current EMS Instance name in GCP console

GCP_PROJECT_ID = GCP project ID used by the current EMS instance

GCP_REGION = GCP region used by current EMS instance

GCP_ZONE = GCP zone used by current EMS

EMS_INSTANCE_NAME-snapshot = Snapshot name for the current EMS boot disk.

DISK_NAME = Current EMS boot device name, by default same as EMS instance name.

Stop current EMS instance -  

From this step till procedure is done, EMS UI & CLI will not be accessible, NFS i/o will continue as usual, without interruption.

gcloud compute instances stop $EMS_INSTANCE_NAME --project $GCP_PROJECT_ID --zone $GCP_ZONE

Snapshot current EMS disk -

gcloud compute disks snapshot $EMS_INSTANCE_NAME --storage-location $GCP_REGION --project $GCP_PROJECT_ID --zone $GCP_ZONE --snapshot-names $SNAPSHOT_NAME

Detach current EMS hdd boot device - 

gcloud compute instances detach-disk $EMS_INSTANCE_NAME --disk=$DISK_NAME --zone $GCP_ZONE --project $GCP_PROJECT_ID

Delete current EMS hdd boot disk -

Don't progress to this step until all previous steps finished successfully.

gcloud compute disks delete $DISK_NAME --zone $GCP_ZONE --project $GCP_PROJECT_ID

 

Create new EMS boot device based on pd-ssd -

gcloud compute disks create $DISK_NAME --size 100Gb --source-snapshot $SNAPSHOT_NAME --type=pd-ssd --zone $GCP_ZONE --project $GCP_PROJECT_ID

Attach new ssd boot device to EMS -

gcloud compute instances attach-disk $EMS_INSTANCE_NAME --disk=$DISK_NAME --boot --zone $GCP_ZONE --project $GCP_PROJECT_ID 

gcloud compute instances set-disk-auto-delete $EMS_INSTANCE_NAME --auto-delete --disk=$DISK_NAME --zone=$GCP_ZONE

Start EMS - 

gcloud compute instances start $EMS_INSTANCE_NAME --project $GCP_PROJECT_ID --zone $GCP_ZONE

 

New EMS is ready, connect to the EMS UI CLI, and check is functioning correctly.

• UI - main dashboard work.
• UI - check standard flows used daya by day.
• CLI run - 
  source /root/elfs_admin;elfs-cli system show --id 1
• CLI run - 
  ecs-cli system

If all the commands above, return ok and the UI is functioning correctly, then the migration to ssd boot device finished successfully.