Hardware Installation and User’s Guide
31
Hardware Specifications and Features
3.7.2.2
Configurable I/O Controller SCSI Parameters
When the ICP RAID Controller starts up, its SCSI parameters are automatically set to
their optimal settings. Manual configuration is not required. However, you can customize
I/O SCSI parameters for each channel on the controller by using the ICP RAID Console
menu. Choose Advanced Setup > Configure Controller > Controller Settings. See
Table 3-7
for information about configurable SCSI I/O parameters.
3.8
RAID Controller Drive Maximum Quantities (Host,
Array, Logical, and Physical)
This section provides information on the maximum drive quantities for Fibre Channel
Arbitrated Loop (FC-AL and SCSI) connections with the GDT8522RZ and GDT8622RZ
ICP RAID Controller products.
3.8.1
RAID Controller Drive Quantities with Fibre Channel
See
Table 3-8
for information about maximum drive quantities in an FC-AL configuration
that includes the GDT8522RZ and GDT8622RZ ICP RAID Controller products.
Disconnect
Enabled /
Disabled
Automatic
Enabling this setting allows for the hard drive to
disconnect from the SCSI bus when it’s not
participating in a transfer. This allows for optimal
bus utilization by all devices on the bus.
Tagged
Queues
On / Off
Automatic
When enabled, this feature allows the SCSI hard
drive to execute more than one command at a
time.
Disk Read
and Write
Cache
On / Off
Configurable
For performance reasons, the
Read Ahead and
Write cache of the hard drives should always be
on. The default setting is On.
Table 3-6. Configurable Disk Drive SCSI Parameters
Table 3-7. Configurable I/O Controller SCSI Parameters
Parameter
Setting/Value
Description
Domain Validation
On / Off
When this is set to
On, Domain validation allows for a
cyclical check of the correct data transfer at a given rate for
the respective channel.
Table 3-8. RAID Controller Drive Maximum Quantities with Fibre Channel
Drive Type
Per Loop
Per Controller
Per Array Drive
Per Host Drive
Physical Disk Drives
126
252 (see note)
35
252
RAID Array Drives
63
126
1
RAID Host Drives
252
2
