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This section discusses some of the available xSeries storage solutions and
related technologies, as well as tape backup and performance considerations.
Note: All the IBM Storage Solutions are supported under Linux, as well as
under Windows. For more information see:
http://www.storage.ibm.com/linux
ServeRAID with external storage enclosures
The current ServeRAID-4 family of adapters includes the ServeRAID 4Mx and
4Lx. These 64-bit, Active PCI controllers include advanced features such as
Logical Drive Migration, nine RAID levels including RAID 1E, 1E0 and 5E, as well
as adapter and cluster failover.
Restriction: At the time of writing, the ServeRAID adapters were not
supported due to the unavailability of a 64-bit version of the ServeRAID
configuration CD-ROM.
ServeRAID-4Mx features two Ultra160 SCSI channels, 64 MB of
battery-backed ECC cache memory, and an Intel i80303 processor. Up to 28
Ultra160 and Ultra2 SCSI devices are supported.
ServeRAID-4Lx features one Ultra160 SCSI channel, 32 MB of ECC cache
memory, and an Intel i80303 processor. Up to 14 Ultra160 and Ultra2 SCSI
devices are supported.
Each ServeRAID adapter supports up to 14 drives (and 160 MBps
throughput) per channel (for an aggregate of up to 56 drives, for example).
Multiple adapters can be installed as needs and available slots dictate.
Note: ServeRAID 4H is not a supported option with the x450.
The EXP300 storage expansion unit has a maximum 1 TB of disk storage (14
146.8 GB drives) in a 3U package, allowing up to 14 expansion units to be
used in a standard 42U rack (meaning that a full rack of EXP300 units can
hold an amazing 14 TB). The EXP300 provides Predictive Failure Analysis
(PFA) on key components, including hot-swap fans, hard drives, and
redundant power supplies. The EXP300 is optimized for Ultra160 SCSI, with a
sustained data transfer rate of 160 MBps.
For more information on IBM SCSI RAID storage solutions, go to:
http://ibm.com/pc/ww/eserver/xseries/scsi_raid.html
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Chapter 3. Planning
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