Hi,
I work on a backup/recovery product and in that I am into testing of SAP HANA backup/recovery using my third party backup tool.
I have 4node(3+1) HANA setup with a total of 1.5TB RAM. I have created a DB of 1TB DB. I use this for testing backup performance of DB. As for backup persistent data is taken from the disk storage (shared in case of multi node setup) I want to know the size of DB on disks. When I use the following command to check the size of DB "select sum(allocated_page_size) from M_CONVERTER_STATISTICS" I get a size of around 950-970GB, which I feel is correct. But when I take backup of the same DB the backup size will be around 2TB. My log is in "OVERWRITE" state, so logs have some data as a duplicate copy is also ruled out.
Request you to help me understand the reason for this difference in DB size on disk and in backup.
Thanks,
Prasanna