Space requirements for SAP HANA protection
Before you start backing up SAP HANA databases, ensure you have enough free disk space on the target and source hosts, and in the vSnap repository. Extra free disk space is required on the volume groups on the source host for creating temporary Logical Volume Manager (LVM) snapshots of the logical volumes that the SAP HANA database files are stored on. To create LVM snapshots of a protected SAP HANA database, ensure that the volume groups with SAP HANA data have sufficient free space.
LVM snapshots
LVM snapshots are point-in-time copies of LVM logical volumes. They are space-efficient snapshots with the changed data updates from the source logical volume. LVM snapshots are created in the same volume group as the source logical volume. The IBM Spectrum® Protect Plus SAP HANA agent uses LVM snapshots to create a temporary, consistent point-in-time copy of the SAP HANA database.
The IBM Spectrum Protect Plus SAP HANA agent creates an LVM snapshot which is then mounted, and copied to the vSnap repository. The duration of the file copy operation depends on the size of the SAP HANA database. During file copying, the SAP HANA application remains fully online. After the file is copied, the LVM snapshots are removed by the IBM Spectrum Protect Plus SAP HANA agent in a cleanup operation.
For every LVM snapshot logical volume containing data, allow at least 10 percent of its size as free disk space in the volume group. If the volume group has enough free disk space, the IBM Spectrum Protect Plus SAP HANA agent reserves up to 25 percent of the source logical volume size for the snapshot logical volume.