Veritas Volume Manager 5.0 Administrator's Guide (September 2006)

441Using Storage Expert
Identifying configuration problems using Storage Expert
Disk groups
Disks groups are the basis of VxVM storage configuration so it is critical that the integrity
and resilience of your disk groups are maintained. Storage Expert provides a number of
rules that enable you to check the status of disk groups and associated objects.
Checking whether a configuration database is too full (vxse_dg1)
To check whether the disk group configuration database has become too full, run rule
vxse_dg1.
By default, this rule suggests a limit of 250 for the number of disks in a disk group. If one
of your disk groups exceeds this figure, you should consider creating a new disk group.
The number of objects that can be configured in a disk group is limited by the size of the
private region which stores configuration information about every object in the disk
group. Each disk in the disk group that has a private region stores a separate copy of this
configuration database.
For information on creating a new disk group, see “Creating a disk group” on page 163.
Checking disk group configuration copies and logs (vxse_dg2)
To check whether a disk group has too many or too few disk group configuration copies,
and whether a disk group has too many or too few copies of the disk group log, run rule
vxse_dg2.
Checking “on disk config” size (vxse_dg3)
To check whether a disk group has the correct “on disk config” size, run rule vxse_dg3.
Checking the version number of disk groups (vxse_dg4)
To check the version number of a disk group, run rule vxse_dg4.
For optimum results, your disk groups should have the latest version number that is
supported by the installed version of VxVM.
If a disk group is not at the latest version number, see the section “Upgrading a disk
group” on page 200 for information about upgrading it.
Checking the number of configuration copies in a disk group
(vxse_dg5)
To find out whether a disk group has only a single VxVM configured disk, run rule
vxse_dg5.
See “Creating and administering disk groups” on page 157 for more information.