HP StorageWorks 2/64 HP StorageWorks Fabric OS 5.x Command Reference Guide (AA - Page 125
The R_A_TOV, E_D_TOV, WAN_TOV, and MAX_HOPS configuration parameters are, Suppress Class F Traffic
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MAX_HOPS Maximum hops (MAX_HOPS) is an integer that denotes the upper limit on the number of hops a frame might have to traverse to reach any destination port from any source port across the fabric. NOTE: The R_A_TOV, E_D_TOV, WAN_TOV, and MAX_HOPS configuration parameters are inter-related. Assigning a specific value to one or more of these parameters can change the range of allowed values that can be assigned to the other parameters. As a result, the user might not be able to set all the values within the range displayed against each parameter. To reduce problems, the configuration utility validates the modified parameter values and prompts the user to re-enter some values, if the validation check fails. Data Field Size Sequence-Level Switching Disable Device Probing Suppress Class F Traffic Switch PID Format Per-frame Route Priority Long Distance Fabric The data field size specifies the largest possible value, in bytes, and advertises this value to other switches in the fabric during construction of the fabric as well as to other devices when they connect to the fabric. Setting this to a value smaller than 2112 might result in decreased performance. When sequence-level switching is set to 1, frames of the same sequence from a particular source are transmitted as a group. When this feature is set to 0, frames are transmitted interleaved among multiple sequences. Under normal conditions, sequence-level switching should be disabled for better performance. However, some host adapters have performance issues when receiving interleaved frames from multiple sequences. When there are such devices attached to the fabric, sequence-level switching should be enabled. When disable device probing is set to 1, devices that do not register with the name server are not present in the name server data base. Set this mode only if the switch N_Port discovery process (PLOGI, PRLI, INQUIRY) causes an attached device to fail. When this mode is set to 1, all Class F interswitch frames are transmitted as Class 2 frames. This is to support remote fabrics that involve ATM gateways, which don't support class F traffic. The formats are as follows: 0 Native PID format (16 based, 16 port format), for fabrics with legacy low-count-port switches. 1 Core PID format (0 based, 256 port format), preferred mode for mixed fabrics with legacy and new switches. 2 Extended edge PID format (16 based, 256 port format), used in mixed fabrics with legacy and new switches to avoid need to reboot host systems when static PID binded is used. In addition to the eight virtual channels used in frame routing priority, support is also available for per-frame-based prioritization when this value is set. When Per-frame Route Priority is set to 1, the virtual channel ID is used in conjunction with a frame header to form the final virtual channel ID. When this mode is set to 1, ISLs in a fabric can be up to 100 km long. The exact distance level is determined by the per-port configuration on the E_Ports of each ISL. Both E_Ports in an ISL must be configured to run the same long-distance level; otherwise, the fabric will be segmented. The Extended Fabric License is required to set this mode. Fabric OS 5.x command reference guide 125
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