>
Add or initialize disks
Menu: VolumeManager/Disk/AddDisks

Use this operation to add one or more disks to a disk group. You can add the selected disks to an existing disk group or to a new disk group that will be created as a part of the operation. The selected disks may also be added to a disk group as spares. The selected disks may also be initialized without adding them to a disk group leaving the disks available for use as replacement disks.

More than one disk or pattern may be entered at the prompt. Here are some disk selection examples:

all: all disks
c3 c4t2: all disks on both controller 3 and controller 4,target 2
c3t4d0: a single disk

Select disk devices to add:
[,all,list,q,?]list

can be a single or more disks and/or controllers. If
consists of multiple items, those items must be separated by white space.

list at the prompt displays a list of the disks available to the system, followed by a prompt at which you should type the device name of the disk to be added:

DEVICE DISK GROUP STATUS
c0t0d0 disk01 rootdg online
c0t1d0 disk02 rootdg online
c0t2d0 disk03 rootdg online
c0t3d0 - - online
c1t0d0 disk10 rootdg online
c1t0d1 - - error
.
.
.
c3t0d0 - - error
c3t1d0 disk33 rootdg online
c3t2d0 disk34 rootdg online
c3t3d0 disk35 rootdg online

Select disk devices to add:
[,all,list,q,?] c1t0d1

All disks attached to the system are recognized by the Volume Manager and displayed here.. Error status indicates disks not recognized by volume manager as part of volume manager and can be used to add in the volume manager .. Disks with a name , group and online status are present in volume manager in a valid volume manager disk group .One or more disks separated by space can be selected for adding into volume manager.

Here is the disk selected. Output format: [Device_Name]
c1t2d0
Continue operation? [y,n,q,?] (default: y) y

You can choose to add this disk to an existing disk group, a
new disk group, or leave the disk available for use by future
add or replacement operations. To create a new disk group, select a disk group name that does not yet exist. To leave the disk
available for future use, specify a disk group name of “none”.

Which disk group [,none,list,q,?] (default: rootdg)

Use a default disk name for the disk? [y,n,q,?] (default: y)

Add disk as a spare disk for rootdg? [y,n,q,?] (default: n) n

The selected disks will be added to the disk group rootdg with
default disk names.

c1t2d0

Continue with operation? [y,n,q,?] (default: y) y

The following disk device has a valid VTOC, but does not appear to have
been initialized for the Volume Manager. If there is data on the disk
that should NOT be destroyed you should encapsulate the existing disk
partitions as volumes instead of adding the disk as a new disk.
Output format: [Device_Name]
c1t2d0
Encapsulate this device? [y,n,q,?] (default: y) n
c1t2d0
Instead of encapsulating, initialize? [y,n,q,?] (default: n) y
Initializing device c1t2d0.
Adding disk device c1t2d0 to disk group rootdg with disk
name disk39.
Add or initialize other disks? [y,n,q,?] (default: n)
2.2 Encapsulate one or more disks

This is used to bring the disk under volume manager , which are already present in the system with data but without volume manager . Data on these disks are not disturbed and if these disks meets certain volume manager requirements these are added under volume manager.

System needs rebooting if encapsulation is used for disk with mounted filesystem or running applications . Also the old device names needs to be changed in applications/scripts to reflect the new volume name.

vfstab information is updated automatically but it is worthwhile to check vfstab if changes are proper as any discrepancy in vfstab may cause system boot failure on next reboot.

Encapsulation preserves any existing data on the disk when the disk is placed under volume manager control. To reduce the

chance of encapsulation failure, make sure that the disk meets the following requirements:-

* It has a small amount of free space (at the beginning or end of the disk) that does not belong to any partition
* It has two free partitions
* It has an s2 slice that represents the whole disk

One of the most common application is encapsulation of root disk to bring it under volume manager and then mirror it to have an alternate boot disk .

The EEPROM variable use-nvramrc? must be set to true and an alternate boot disk alias name needs to be defined to access the second boot disk by an alternate alias name in case primary disk fails.

ok>eeprom use-nvramrc?=true

Procedure for encapsulating a disk for volume manager use is as follows:

Select menu item 2 (Encapsulate one or more disks) from the vxdiskadm main menu and follow the prompts

This entry was posted on Thursday, December 3rd, 2009 at 2:54 pm and is filed under Volumes. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14