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Configuring iSCSI protocol for each iSCSI port (Optional)
Each iSCSI port can be configured to operate using different iSCSI protocol parameters. These parameters
are negotiated during the iSCSI login phase. The parameters that can be configured are:
•
Error recovery level—Support for iSCSI error recovery level up to 2
•
TCP connections per session—Support of up to 2 TCP connections per iSCSI session. The connections
can be on the same iSCSI port or span two iSCSI ports on the same blade.
•
Header Digest—CRC32c operation for iSCSI header protection
•
Data Digest—CRC32c operation for iSCSI data protection
•
Immediate Data
•
First Burst Length—Amount of immediate data that can come in to the iSCSI port with the write
command; Immediate Data also needs to be enabled.
iscsiportcfg [--modify | --show | --clearstats | --default]
[slot_number/]port_number
The following example shows how to configure the parameters described above for slot 7 and port ge0:
switch:admin> iscsiportcfg --modify 7/ge0
Please specify parameters to modify
Usage: iscsiportcfg [--modify | --show | --clearstats | --default]
[SlotNumber/]PortNumber
[-h (help)]
[-e (error recovery level) 0...2]
[-c (TCP connections/session) 1...2]
[-a (header digest) 0-disable 1-enable]
[-d (data digest) 0-disable 1-enable]
[-i (immediate data) 0-disable 1-enable]
[-f (first burst length) 512 | 1024 | 2048 | 4096 | 8192 | 16384 | 32768]
switch:admin>
switch:admin> iscsiportcfg --modify 7/ge0 -f 32768 -e 2 -c 2 -i 1 -a 1 -d 1
The operation completed successfully.
The following example shows how to display the configured port parameters:
switch:admin> iscsiportcfg --show 7/ge0
The configured port parameters for slot 7 and port ge0 are:
Header Digest: On
Data Digest: On
First Burst Length: 32768
Error Recovery Level: 2
Immediate Data: On
Connections per session: 2
Num. of active sessions on port: 0
...
DC SAN Backbone Director hardware reference guide 121
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