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.)
| mpathadm Commands | |
|---|---|
| Task | Command |
| List available multipathing support | mpathadm list mpath-support |
| View properties for supported multipathing facilities. | mpathadm show mpath-support facilityname |
| List initiator ports. | mpathadm list initiator-port |
| Get initiator port properties. | mpathadm show initiator-port portname |
| List available logical units. | mpathadm list lu |
| Get logical unit properties. | mpathadm show lu lunname |
| List logical units associated with a target port. | mpatadm list lu -t portname |
| Configure auto-failback. | mpathadm modify mpath-support -a off facilityname |
| Disable a path. | mpathadm disable path -i initportname -t tgtportname -l luname |
Adding Third Party Device Support
Support for many third-party devices is not contained in the default version of the
configuration file at /kernel/drv/scsi_vhci.conf. The following shows the
changes necessary to bring EMC Symmetrix support into the multipathing software:
# cat /kernel/drv/scsi_vhci.conf
#
# Copyright 2004 Sun Microsystems, Inc. All rights reserved.
# Use is subject to license terms.
#
#pragma ident "@(#)scsi_vhci.conf 1.9 04/08/26 SMI"
#
name="scsi_vhci" class="root";
...
# symmetric-option = 0x1000000;
device-type-scsi-options-list =
"EMC SYMMETRIX 5671", "symmetric-option";
symmetric-option = 0x1000000;
Unfortunately, the syntax on the scsi_vhci.conf file is incredibly picky.
The vendor name must be exactly eight characters long, even if you have
to pad it with spaces. The product ID can be “up to” 16 characters long,
but most recommendations I've seen say to pad the product ID with spaces as well.
Fortunately, the scsi_vhci.conf file contains helpful syntax comments.
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