Monday, December 14, 2009

Solaris Multipathing

Solaris Multipathing
The “Solaris FC and Storage Multipathing Software” is included with the Solaris 10 license. It is enabled by default with the Solaris 10x86 installation, but is optional in the Sparc installlation.
Currently, the software supports multipathing for fibre channel connections using supported host bus adapters. It does not currently support multipathing for parallel SCSI devices or IP over FC.
For Sparc-based systems, multipathing support is enabled and disabled via the stmsboot -e and stmsboot -d commands. This command reboots the system to complete the process, so make sure that the right boot-device is included in the EEPROM settings before proceeding.
When multipathing is enabled, copies of the /etc/vfstab and /kernel/drv/fp.conf files are preserved to allow the changes to be backed out if necessary.
For x86-based systems, directly edit the fp.conf to change the value of mpxio-disable to “no.” (Disabling it will involve changing it to “yes.”) After the change, run a reconfiguration reboot.
To enable or disable multipathing on a per-port basis, the mpxio-disable parameter may be set on a port-specific line in the fp.conf. (Syntax guidance is included in the comments of the fp.conf file.)

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