Unity arrays can use Dell EMC Virtual Provisioning™ to provide capacity to an application. The capacity is allocated using Virtual Provisioning data devices and provided through storage pools based on the disk technology and RAID type.
For SAP HANA production installations, Dell EMC recommends using flash drives for the SAP HANA persistence (data and log volumes) to meet the SAP HANA KPIs.
Using flash devices provides benefits for SAP HANA production installations as follows:
Flash drives successfully meet the SAP HANA performance KPIs for the SAP HANA persistence. Dell EMC recommends the following RAID protection for SAP HANA production systems:
If there is not enough flash capacity available, you can use a
FAST VP enabled storage pool RAID 5 8+1 (flash) on the Extreme performance tier for data devices and RAID 5 4+1 (SAS) on the performance tier for log devices.
Dell EMC recommends creating one storage pool for all SAP HANA data volumes and log volumes in a Unity array when using both an all-flash and a hybrid model.
Although the SAP performance KPIs do not apply to SAP HANA nonproduction installations, those installations are still critical components in an overall SAP landscape. Dell EMC recommends using the SAS drives for all SAP HANA nonproduction installations on the Unity hybrid models when you provision storage.
When using NAS in Unity arrays to provide the NFS share for the SAP HANA scale-out systems, the NL-SAS or SAS drives are sufficient when you provision additional capacity for the /hana/shared on the Unity hybrid models.
Using the NL-SAS or SAS drives for the OS boot image on the Unity hybrid models is sufficient.
In Unity OE version 4.1 and later, Unity compression is supported on THIN LUNs and can be enabled during the LUN creation process, or enabled and disabled at a later time. The storage compression rates achieved for the SAP HANA database are typically lower than for traditional databases. This is because the SAP HANA column store compresses automatically and optimizes the compression after any changes. For best performance, Dell EMC therefore recommends not enabling Unity compression for SAP HANA production installations. For more information on Unity compression, see the EMC Unity: Compression Overview White Paper.