nStor Corporation Ultra S2S User Manual page 56

Configuration
46
Configuring the Array
AdminiStor PC Utilities
2 Channel - 16 Targ, 16MB SX DAC960SX at p1 0000 c0
<F1>= help
Per Channel:
Data transfer rate -
Command tagging
Data bus width
Per Device:
Elevator -
Global:
Max IOPs Limit - 0
Spin up option - Automatic / 2 / 6 / 0
Item Help
Sets the maximum data transfer rate of the back end channel. The controllers
will not negotiate faster than this rate.
Use Cursor keys for selection, <Enter> to select, <Esc> to Previous Menu
a Ensure that the "Data transfer rate" value for both Channels is set to
20MHz. This is the recommended setting for Ultra SCSI mode.
b Verify that the settings for "Command tagging" and "Data bus width" are
configured to Enabl and 16bit, respectively.
c Ensure the settings for the Device options are configured as follows:
"Elevator" – Disabl, "Coalescing" – Disabl, and "Que Limit" – 0.
With Elevator enabled, the controller orders commands to the drives
based on the Logical Block Address (LBA) in an attempt to keep the
heads moving in the same direction. The default and recommended
setting is disabled. Although this parameter is available for performance
tuning, modern disk drives do a better job of this.
With Coalescing enabled, the controller attempts to combine small
sequential requests into larger requests in an attempt to improve
performance. The default and recommended setting is disabled.
Que Limit value controls the maximum number of drive command queue
tags used by the controller. The available values are 2-230. The default
value is 32 (FAIDfx value of 0 implies 32). The recommended value is
the maximum command queue depth of the drive. If duplex controllers
will both be actively accessing the drive (e.g., a multi-system drive
redundancy group where each controller accesses one or more system
drives thus sharing the physical drives) half the maximum queue depth is
recommended.
Disk Side Parameters
0 1
20MHz 20MHz 20MHz
- Enabl Enabl
- 16bit 16bit
Disabl Coalescing - Disabl Que Limit - 0
Version 7.11
Firmware: t6, v3.30-00
2 3 4
Async Async Async
Disab Disab Disab
16bit 16bit 16bit