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Hardware Installation and User’s Guide 21
Hardware Specifications and Features
Warning:
†† The SRCMRU adapter, with firmware 2.34.yy-Rzzz, is not compatible with all
previous controllers and firmware versions. Do not attempt RAID Array Drive
Roaming between RAID controllers that are not compatible with the SRCMRU
controller. Unpredictable behavior may include, but is not limited to, data loss or
corruption.
Compatible controllers include:
• SRCU42L – Firmware version 2.34.yy-Rzzz
• SRCU31LA - Firmware version 2.3x.yy-Rzzz
• SRCU31A– Firmware version 2.3x.yy-Rzzz
• SRCU32 – Firmware version 2.3x.yy-Rzzz
• SRCMRU – Firmware version 2.3x.yy-Rzzz
• SRCZCR – Firmware version 2.3x.yy-Rzzz
Note:
Compatibility refers only to how data and RAID configuration information are written to
the hard disks. Compatible adapters have the same data file format.
3.5 Optional Features
There are no optional features for this product.
3.6 RAID Controller Drive Limitations (Host, Array,
Logical, and Physical)
The following are limitations assuming the following:
• U160 or U320 speed depending on the SCSI controller on the motherboard
• Dual channel SCSI controller
• Cabling that meets U160 or U320 specifications depending on the SCSI controller
Physical drives are limited by the number of SCSI channels being controlled by the
RAID controller. The firmware/software supports a maximum of 15 hard disk drives per
channel (or 14 if one SCSI ID is being occupied by an intelligent enclosure processor).
The maximum number of array drives is limited to 35 by the RAID firmware. The actual
maximum limit of the SRCMRU RAID controller is 15, see Table 3-5. The firmware
supports channel spanning where an array can consist of physical drives that are attached
to either one or to both channels of the RAID controller. An array drive requires a
minimum of two hard disk drives (or logical drives). Therefore the maximum array
limitation for each RAID controller is the physical drive limit of that RAID controller
divided by two. An array drive can contain (or have reside on it) up to a maximum of 2
host drives.