Table 13. Feature comparison
Feature ServeRAID M5210 N2215
NVMe
Extender
Adapter type RAID controller SAS HBA PCIe Extender
Part number 46C9110 47C8675 00ML997
Form factor PCIe low profile PCIe low profile PCIe low profile
Controller chip LSI SAS3108 LSI SAS3008 None
Host interface PCIe 3.0 x8 PCIe 3.0 x8 PCIe 3.0 x8
Port interface 12 Gbps SAS 12 Gbps SAS PCIe NVMe
Number of ports 8 8 2
Port connectors 2x Mini-SAS HD x4
(SFF-8643)
2x Mini-SAS HD
x4
(SFF-8643)
OCuLink
Drive interface SAS, SATA SAS, SATA NVMe
Drive type HDD, SSD, SED HDD, SSD SSD
Hot-swap drives Yes Yes Yes
Max devices 240 1024 2
RAID levels 0/1/10; Optional 5/50
(RAID 5 FoD, 47C8708, or cache
upgrades)
Optional 6/60 (47C8706)
None None
JBOD mode Yes (without cache) Yes Yes
Cache 1 GB no backup (47C8656)
1 GB flash backup (47C8660)
2 GB flash backup (47C8664)
4 GB flash backup (47C8668)
None None
CacheVault cache protection Optional None None
Performance Accelerator
(FastPath)
Optional (47C8710) No No
SSD Caching (CacheCade Pro
2.0)
Optional (47C8712) No No
SED support (SafeStore) Yes (with RAID 5 FoD upgrade
or any cache upgrade
No No
For more information, see the list of Lenovo Press Product Guides in the RAID adapters category:
https://lenovopress.com/servers/options/raid
The NVMe PCIe SSD Extender Adapter is a PCIe adapter that simply routes the PCIe 3.0 x8 signal from
the slot in the Storage Book, splits the signal to two x4 links, and routes those via cables to the drive
backplane. The extender adapter is shown in the following figure.
One adapter is required for every two drives installed in the Storage Book. Since there are only two PCIe
slots in the Compute Book, only two adapters can be installed and therefore only four NVMe drives can be
installed in a Storage Book.
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