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3.3.3 ServeRAID-MR10k RAID controller
To extend the basic RAID-0 (IS) and RAID-1 (IM) provided by the internal
LSI1078 SAS controller and support the external SAS port, install the optional
ServeRAID-MR10k controller. The ServeRAID-MR10k controller is a PCIe x8
RAID controller implemented as a DIMM card with 240 pins and has 256 MB
ECC DDR2 cache.
The ServeRAID-MR10k is installed into a dedicated socket on the I/O board near
the PCI Express slots as shown in Figure 3-21.
Figure 3-21 Optional installed ServeRAID-MR10k
The ServeRAID-MR10k supports stripe sizes from 8 KB to 1024 KB. The default
stripe size is 128 KB. The SAS drive can be driven with up to 3 GBps for each
port in full-duplex mode.
The controller supports up to 64 virtual disks, and up to 64 TB logical unit
numbers (LUNs). It supports up to 120 devices on the external x4 port. IBM
supports the use of up to nine cascaded and fully populated EXP3000
enclosures on the external port with up to a total of 108 disk drives.
The ServeRAID-MR10k controller has an LSI 1078 ASIC on the designated
DIMM card. The cache data is secured by the iTBBU package as described in
"Intelligent transportable battery backup unit (iTBBU)" on page 130.
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Planning, Installing, and Managing the IBM System x3950 M2
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