Veritas Volume Manager 4.1 Administrator's Guide (HP-UX 11i v3, February 2007)

Identifying Configuration Problems Using Storage Expert
388 VERITAS Volume Manager Administrator’s Guide
Checking for Non-Mirrored RAID-5 Logs (vxse_raid5log3)
To check that the RAID-5 log of a large volume is mirrored, run the vxse_raid5log3
rule.
A mirror of the RAID-5 log protects against loss of data due to the failure of a single disk.
You are strongly advised to mirror the log if vxse_raid5log3 reports that the log of a
large RAID-5 volume does not have a mirror.
For information on adding a RAID-5 log mirror, see “Adding a RAID-5 Log” on page 243.
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 137.
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.