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VXDMPVSCSI (1M)

Maintenance Commands

Table of contents


NAME

vxdmpvscsi - manage DMP on vSCSI devices

SYNOPSIS

vxdmpvscsi addarraysupport vid offset length

vxdmpvscsi disable

vxdmpvscsi enable

vxdmpvscsi iopolicy {A/P | A/P-LB}

vxdmpvscsi listsupport

vxdmpvscsi rmarraysupport vid offset length


DESCRIPTION

The vxdmpvscsi utility handles all operations that are specific to Virtual SCSI (vSCSI) devices, including enabling and disabling DMP on such devices.

KEYWORDS

addarraysupport
Adds support for using an array as a vSCSI device with DMP. By default, EMC, HITACHI and IBM arrays are supported as underlying devices.

The required arguments are:

vid
The vendor ID (VID) string for the array.
offset
The offset location in the inquiry page in hexadecimal.
length
The length of the VID string in hexadecimal.

After using this command, run the rmdev and cfgmgr commands to remove and recreate the devices.

The following are examples of using this command:


vxdmpvscsi addarraysupport SHARK 08 04
vxdmpvscsi addarraysupport FUJITSU 08 07

disable
Disables DMP for vSCSI devices. Once DMP support has been disabled, MPIO takes control of the devices, and implements multipathing features such as failover and load balancing; DMP acts in pass-through mode.
enable
Enables the use of DMP with vSCSI devices (this is the default behavior). Support for additional arrays can be added by using the addarraysupport operation.
iopolicy
Sets the I/O policy for vSCSI devices. The following policies may be specified:
A/P
Makes the vSCSI devices behave like Active/Passive arrays. All the paths on one Virtual I/O (VIO) server are active, and the paths on the other VIO server acts in standby mode. At any point in time, I/O is allowed on only one path of the active VIO server. Load balancing of I/O on multiple paths at the same time is not supported.
A/P-LB
Configures LUN load-balancing for the vSCSI devices, by dividing the LUN paths between two active VIO servers.

listarraysupport
Lists the arrays that are supported for use with vSCSI devices. By default, support for EMC, HITACHI and IBM arrays is enabled. Support for other arrays may be enabled by using the addarraysupport operation.
rmarraysupport
Removes support for using an array as a vSCSI device with DMP. See addarraysupport for a description of the arguments.

After using this command, run the rmdev and cfgmgr commands to remove and recreate the devices.


FILES

/etc/vx/aslconf.info
File containing iopolicy information. This file must not be edited manually.

SEE ALSO

cfgmgr(1M), rmdev(1M), vxdmpadm(1M)

Last updated: 1 Aug 2006
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