Controller memory :256 GB RAM per system (128 GB per controller). 32 GB battery-backed NVRAM per system (16 GB per controller) mirrored between the controllers.

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Lenovo ThinkSystem DM7100H Unified Hybrid Storage Array 256 GB RAM Per System

Form factor	* DM7100H controller enclosure (machine type 7D26): 4U rack mount. * DM240S 2U24 SFF expansion enclosure (machine types 7Y58, 7D7X): 2U rack mount. * DM120S 2U12 LFF expansion enclosure (machine types 7Y59, 7D7Y): 2U rack mount. * DM600S 4U60 LFF expansion enclosure (machine types 7Y43, 7D7Z): 4U rack mount.
Controller configuration	Dual active-active controller configuration (HA pair). Up to 6 HA pairs can be combined into a single SAN cluster, or up to 12 HA pairs can be combined into a single NAS cluster.
HA pair/cluster interconnect ports	4x 25 GbE SFP28 onboard ports (DAC cables) (2 ports per controller).
Drives	* 2U24 SFF drives: * 900 GB, 1.2 TB, and 1.8 TB 10K rpm SAS HDDs. * 960 GB, 3.84 TB, 7.68 TB, and 15.36 TB SAS SSDs. * 2U12 LFF drives: 4 TB, 8 TB, 10 TB, and 16 TB 7.2K rpm NL SAS HDDs. * 4U60 LFF drives: 4 TB, 8 TB, 10 TB, and 16 TB 7.2K rpm NL SAS HDDs.

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