Lenovo Flex System x240 M5 Product Manual page 16

The following figure shows the adapter, flash power module and backplane that are included in the option.
The included backplane replaces the standard backplane that came with the server. The backplane also
serves as the conduit to route the PCIe signals from the system board to the RAID controller.
Figure 5. ServeRAID M5215 SAS/SATA controller
Note: The ServeRAID M5215 installed in the x240 M5 only supports two 2.5-inch drives using the
supplied backplane. 1.8-inch drives are not supported.
The ServeRAID M5215 SAS/SATA controller has the following features:
Eight internal 12 Gbps SAS/SATA ports (also supports 6 Gbps)
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PCI Express 3.0 x8 host interface
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12 Gbps throughput per port
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LSI SAS3108 12 Gbps RAID on Chip (ROC) controller
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Onboard 2 GB data cache (DDR3 running at 1866 MHz)
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Support for RAID levels 0 and 1
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Standard flash power module (supercapacitor-based) provides the power capacity needed to off-load
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the cache to flash in the event of a power failure
Support SAS and SATA HDDs and SSDs
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Support for intermixing SAS and SATA HDDs and SSDs; mixing different types of drives in the same
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array (drive group) is not recommended
Support for self-encrypting drives, SEDs (LSI MegaRAID SafeStore)
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Optional support for SSD performance acceleration with MegaRAID FastPath
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Support for up to 64 virtual disks, up to 128 arrays, and up to 16 virtual disks per array
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Support for logical unit number (LUN) sizes up to 64 TB
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Configurable stripe size up to 1 MB
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Compliant with Disk Data Format (DDF) configuration on disk (COD)
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S.M.A.R.T. support
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MegaRAID Storage Manager management software
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The Performance Accelerator upgrade (47C8710), implemented using the LSI MegaRAID FastPath
software, provides high-performance I/O acceleration for SSD-based virtual drives by using an extremely
low-latency I/O path to increase the maximum I/O per second (IOPS) capability of the controller. This
feature boosts the performance of applications with a highly random data storage access pattern, such as
transactional databases. Part number 47C8710 is a Feature on Demand license.
Lenovo Flex System x240 M5 16