Expansion Scenario

ECS Expansion

• Modifying ECS Specifications
  If the ECS specifications do not meet service requirements, you can modify the ECS specifications, including vCPUs and memory. Table 1 describes an example where an SAP HANA ECS is upgraded from e1.4xlarge to e1.8xlarge.

  Table 1 ECS specification modification

  ECS Name	Before	After
  hana01	e1.4xlarge	e1.8xlarge

• Modifying Specifications and AZ/Region

  If you need to migrate an ECS to another AZ or region when upgrading the ECS configuration, you can create a full-ECS image on HUAWEI CLOUD for the migration.

• Modifying Specifications and AZ/Region with Low RTO

  If you need to migrate an ECS to another AZ or region when upgrading the ECS configuration, use full-ECS image and backup recovery or system replication for the migration to reduce RTO.

EVS Disk Capacity Expansion

EVS disk capacity expansion is to expand the system disk or data disk to meet data storage requirements. For details about the pricing of a changed specification, see Pricing of a Changed Specification.

• For details about Expanding EVS Disk Capacity (Without LVM), see Table 2.

  Table 2 EVS disk capacity expansion (without LVM)

  EVS Disk Name	Capacity Before Expansion (GB)	Capacity After Expansion (GB)	Mount Point	Partition	File System	Mounting Directory
  hana01-volume-sys	100	200	xvda	xvda1	ext4	N/A
  hana01-volume-data	470	940	xvdb	None	xfs	/hana/data

  Description:

  A system disk of 100 GB and a data disk of 470 GB are attached to an ECS. The system disk and data disk are expanded to 200 GB and 940 GB, respectively.

• For details about the Expanding EVS Disk Capacity (with LVM), see Table 3.

  Table 3 EVS disk capacity expansion (with LVM)

  EVS Disk Name	Capacity Before Expansion (GB)	Capacity After Expansion (GB)	Mount Point	File System	Mounting Directory	Directory Size Before Capacity Expansion	Directory Size After Capacity Expansion
  hana-data01	400	800	vdb	xfs	/hana/data	696 GB	1.4 TB
  hana-data02	400	800	vdc

  Description:

  There are two data disks of 400 GB each attached to an ECS. A logical volume of 696 GB is divided from the LVM volume that is formed by the two data disks and mounted to the /hana/data directory. You can expand the /hana/data directory to 1.4 TB by expanding the capacity of EVS disks and the file system.