Quantum SNC 4000 User Manual page 101

mapMultipathSet
The mapMutipathSet command configures a device for a given mode of operation.Multiple path target
support is available for Fibre Channel targets only. Three modes are possible.
The first mode is called "single path," which is the default. In this mode, targets are mapped only once,
regardless of how many physical paths there are to the device.
The second mode is called "manual multi-path" (MMP). In this mode the SNC will map a single Fibre
Channel attached device through both Fibre Channels on an SNC 4000 series. This feature requires
specialized high availability host software. It is a separately licensed feature.
The third mode is called "automatic multi-path" (AMP). In this mode the SNC maps multiple Fibre Channel
paths to a target device and automatically switches the I/O to a good link when link failures occur. This
feature can be used to create redundancy on all Fibre Channel links between the SNC and the target
including links not directly connected to the SNC (i.e., target to switch). AMP does not require specialized
host software. It is a separately licensed feature.
After setting up the mapping mode, the device must be mapped by
CAUTION
using the fcRescan command. For more information, see the
fcRescan [port]command.
Value Meaning
0 Multipath mode set to single path mode
1 Multipath mode set to manual control mode
2 Multipath mode set to automatic mode.
SNC > mapMultipathSet 0
Multipath mode set to single path mode.
value = 0 = 0x0
SNC >
In order to change the mapping mode associated with a given device, the device must first be removed from
the device map using mapRemoveDevice
For more information about this command and an example of its use, refer to the
on page 96.
This command takes a single parameter which is the device ID (DevId) of the device to be removed from
the map. Device ID can be determined by finding the device in the list generated by mapShowDevs.
For more information about this command and an example of its use, refer to the
97.
See also mapMultipathShow.
mapMultipathShow
The mapMultipathShow command displays the current setting for mapping new targets.
SNC > mapMultipathShow
Multipath mode set to automatic mode.
value = 2 = 0x2
SNC >
SNC 4000 User's Guide
[devId].
mapRemoveDevice [devId]
mapShowDevs on page
95