Help Center/ SAP Cloud/ Best Practices/ Best Practices of SAP System Capacity Expansion/ Before You Start/ Expansion Restrictions
Updated on 2023-10-17 GMT+08:00
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Expansion Restrictions

This section describes the restrictions on capacity expansion. You need to learn these restrictions before capacity expansion.

ECS Expansion Restrictions

  • SAP HANA ECSs: You can change ECS types E1 to E2, E2 to E1, and ET2 to E3. Other ECS type changes are not supported.
  • SAP application ECSs: You cannot change ECS types H1 and M3.
Table 1 Supported ECS specification change

ECS Application Scenario

ECS Type Before Change

ECS Type After Change

SAP HANA

E1/E2

E1/E2

ET2

ET2

ET2

E3

e3

e3

SAP applications

H1

H1

M3

M3

c6

c6

EVS Disk Capacity Expansion Restrictions

Table 2 describes the restrictions to the EVS disk capacity expansion.

Table 2 EVS disk capacity expansion restrictions

Type

Restriction

Capacity expansion of EVS disks

Disk capacities can be expanded only, but cannot be reduced.

Capacity expansion of non-shared disks

Only certain ECS OSs support capacity expansion of non-shared disks in the In-use status. For details, see Expanding an In-use EVS Disk.

If an EVS disk in the In-use status is to be expanded, the ECS OS to which the EVS disk is mounted must meet the requirements. If the server OS does not support capacity expansion of In-use disks, detach the disk and then expand its capacity. Otherwise, you may need to stop and then start the ECS after the expansion to make the expansion takes effect. You do not need to shut down the ECS if OSs are:

SUSE Linux Enterprise Server 12 SP3 64bit

SUSE Linux Enterprise Server 12 SP2 64bit

SUSE Linux Enterprise Server 12 SP1 64bit

Capacity expansion of shared disks

A shared disk must be detached from the ECS before expansion, and the shared disk status must be Available.

Expansion increment

1 GB
When a disk has been put to use, you must check the disk partition style before expanding its capacity as follows:
  • If the MBR partition style is used, the maximum disk capacity supported is 2 TB (2048 GB), and the disk space exceeding 2 TB cannot be allocated and used.
  • With GPT, you can expand the capacity of a data disk to up to 32 TB. An EVS data disk supports up to 32 TB (32768 GB) so that you can expand the capacity of a data disk to up to 32 TB when the GPT partition style is used.

If the in-use partition style is MBR and the disk capacity needs to be expanded to over 2 TB, change the partition style from MBR to GPT. Ensure that the disk data has been backed up before changing the partition style because services will be interrupted and data on the disk will be cleared during this change.

Parent topic: Before You Start