HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software Troubleshooting Guide (EK-G80TS-SA. C01, March 2005)

Utilities and Exercisers
82 HSG60 and HSG80 Array Controller and Array Controller Software Troubleshooting Guide
FL Device Flags.
The controllers interpretation of the SCSI device characteristics.
Example of output:
FL
---
3
FL – Device Flags:
Sum of: 1 = Advanced support; 2 = Fairness Support
Advanced Support:
Devices support certain controller advanced operations such as
Automated Read Retry Enabled (ARRE). In the previous example, the
value 3 denotes that the device supports advanced support and
fairness.
Fairness Support:
Some SCSI devices support an internal functionality that establishes
how it allocates and utilizes the SCSI bus. Since the SCSI bus is an
unfair bus, access to the bus for data transfer is determined by the
SCSI ID. ID priority is (highest to lowest) 7, 6, 5, 4, 3, 2, 1, 0, 15, 14,
13, 12, 11, 10, 9, 8.
A SCSI device that supports its own fairness algorithm automatically
detects its own priority and the activity on the SCSI bus, and then
makes adjustments to establish fairer access to the SCSI bus for lower
priority devices.
In the previous example, the value 3 denotes that the device does
support SCSI-3 Fairness and the Advanced Support. If the device did
not support SCSI-3 fairness the value displayed would be 1
(advanced support).
Table 14: Disk Device Information (Sheet 3 of 4)
Info Displayed Description