98 IBM eX5 Implementation Guide
For more information, see ServeRAID M5015 and M5014 SAS/SATA Controllers for IBM
System x, TIPS0738, at the following website:
http://www.redbooks.ibm.com/abstracts/tips0738.html?Open
ServeRAID M5025 Controller
The key difference between the ServeRAID M5025 and M5015 RAID controllers is that the
M5025 has two
external SAS 2.0 x4 connectors and the M5015 has two internal SAS 2.0 x4
connectors. The ServeRAID M5025 Controller offers these benefits:
Eight external 6 Gbps SAS 2.0 ports implemented through two four-lane (x4) connectors
Two mini-SAS external connectors (SFF-8088)
Six Gbps throughput per SAS port
800 MHz PowerPC processor with LSI SAS2108 6 Gbps RAID on Chip (ROC) controller
PCI Express 2.0 x8 host interface
512 MB onboard data cache (DDR2 running at 800 MHz)
Intelligent lithium polymer battery backup unit standard with up to 48 hours of data
retention
Support for RAID levels 0, 1, 5, 10, and 50 (RAID-6 and RAID-60 support with the optional
M5000 Advanced Feature Key)
Connections:
– Up to 240 SAS or SATA drives
– Up to nine daisy-chained enclosures per port
SAS and SATA drives are supported, but mixing SAS and SATA drives in the same RAID
array is not supported
Support for up to 64 logical volumes
Support for LUN sizes up to 64 TB
Configurable stripe size up to 1024 KB
Compliant with Disk Data Format (DDF) configuration on disk (COD)
S.M.A.R.T. support
Support for the optional M5000 Series Performance Accelerator Key, which is
recommended when using SSD drives in a mixed environment with SAS and SSD:
– RAID levels 6 and 60
– Performance optimization for SSDs
– LSI SafeStore: Support for self-encrypting drive services, such as instant secure erase
and local key management (which requires the use of self-encrypting drives)
Support for the optional M5000 Advanced Feature Key, which enables the following
features:
– RAID levels 6 and 60
– LSI SafeStore: Support for self-encrypting drive services, such as instant secure erase
and local key management (which requires the use of self-encrypting drives)
Performance Key Accelerator: Performance Accelerator Key uses the same features as
the Advanced Feature Key, but it also includes performance enhancements to enable SSD
support in a mixed HDD environment.
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