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Former Member

Replicated SAP HANA DATA reclaim without loosing business time

Dear SAP experts,

I have a productive, replicated (HA) HANA 1.00.122.10 (with SAP ERP on that) where I need to run DATA RECLAIM. The problem is that replication should be deactivated (see 1999880 - FAQ: SAP HANA System Replication' section '19. How can RECLAIM DATAVOLUME be executed when system replication is active?), but the business cannot afford it (only smaller (5-6 hours) downtimes.

Do you have any experience in splitting the data reclaim into several smaller (shorter) slice or running it with replication on, or even execute it faster?

The data size (persistent layer) is 7.7TB (RAM is 3.5TB) and the fragmentation is almost 50%.
On the Test system which is the exact copy of this system it ran 40 hours. I cannot execute something on production which turns off the HA for 40 hours.

Any advise helps.

Many thanks,

Kyle

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    Former Member
    Aug 17, 2017 at 02:16 PM

    Hi Kyle,

    You can find the details of total disk size( for data volume) and the used disk sizes from the studio and then split the task into phases:

    The size should be considered for the Index server of the particular node.

    Example: your total disk size is 2 TB and your usage is 500 GB i.e., hence you can perform the reduction of 2TB to 1.75 TB i.e., reduction of 250 GB as first phase :

    ALTER SYSTEM RECLAIM DATAVOLUME 175 DEFRAGMENT

    you can also follow this from the below article on NetApp:

    https://kb.netapp.com/support/s/article/ka21A0000000jKsQAI/Reduction-of-SAP-HANA-database-volume-using-the-alter-system-reclaim-datavolume-command-might-causes-performance-issues-or-service-disruption?language=en_US

    Best Regards,
    Venkata Ramakrishna D

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