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82 Administering disks
Discovering and configuring newly added disk devices
Discovering and configuring newly added disk
devices
When you physically connect new disks to a host or when you zone new fibre
channel devices to a host, you can use the
vxdctl enable command to rebuild
the volume device node directories and to update the DMP internal database to
reflect the new state of the system.
To reconfigure the DMP database, first run
ioscan followed by insf to make the
operating system recognize the new disks, and then invoke the
vxdctl enable
command. See the
vxdctl(1M) manual page for more information.
You can also use the
vxdisk scandisks command to scan devices in the
operating system device tree, and to initiate dynamic reconfiguration of
multipathed disks.
If you want VxVM to scan only for new devices that have been added to the
system, and not for devices that have been enabled or disabled, specify the
-f
option to either of the commands, as shown here:
# vxdctl -f enable
# vxdisk -f scandisks
However, a complete scan is initiated if the system configuration has been
modified by changes to:
■ Installed array support libraries.
■ The devices that are listed as being excluded from use by VxVM.
■ DISKS (JBOD), SCSI3, or foreign device definitions.
See the
vxdctl(1M) and vxdisk(1M) manual pages for more information.
Partial device discovery
The Dynamic Multipathing (DMP) feature of VxVM supports partial device
discovery where you can include or exclude sets of disks or disks attached to
controllers from the discovery process.
The
vxdisk scandisks command rescans the devices in the OS device tree and
triggers a DMP reconfiguration. You can specify parameters to
vxdisk
scandisks to implement partial device discovery. For example, this command
makes VxVM discover newly added devices that were unknown to it earlier:
# vxdisk scandisks new
The next example discovers fabric devices:
# vxdisk scandisks fabric
The following command scans for the devices c1t1d0 and c2t2d0:
# vxdisk scandisks device=c1t1d0,c2t2d0