Monitoring Disk Resources

Disk Monitor Reference

 

Logical Volume Summary

 

The logical volume summary tells you how accessible the data is in all logical

 

volumes in an active volume group. Sometimes the physical connection may be

 

working, but the application cannot read or write data on the disk. The disk monitor

 

determines I/O activity by querying LVM, and marks a logical volume as DOWN if

 

a portion of its data is unavailable.

 

 

 

 

NOTE

The disk monitor cannot determine data accessibility to logical volumes in an

 

inactive volume group.

 

The values in Table 2-3 are used by the disk monitor to determine how conditions

 

 

compare in logical operations. For example, you may create a request that alerts you

 

when the condition is greater than or equal to INACTIVE_DOWN.

Table 2-3

Interpreting Logical Volume Summary

 

 

 

Resource Name

/vg/vgName/lv_summary

 

 

 

 

Condition

 

Value

Interpretation

 

 

 

 

UP

 

1

All logical volumes are accessible, all data is accessible.

 

 

 

 

INACTIVE

 

2

The volume group is inactive. This could be because:

 

 

 

• The volume group is active in exclusive mode on another node

 

 

 

in an MC/ServiceGuard cluster. (This is not valid for clusters

 

 

 

running MC/LockManager, because it can support a volume

 

 

 

group being active on more than one node.) Note that

 

 

 

MC/ServiceGuard does allow a volume group to be active in

 

 

 

read-only mode, if it is already active on another node.

 

 

 

• The volume group was made inactive usingvgchange -a n

 

 

 

for maintenance or other reasons.

 

 

 

• There was not a quorum of active physical volumes at system

 

 

 

boot, i.e. not enough disks in the volume group were working.

 

 

 

 

INACTIVE_DOWN

 

3

The last time the inactive volume was activated, it was DOWN; at

 

 

 

least one logical volume in the volume was inaccessible

 

 

 

 

DOWN

 

4

At least one logical volume in the volume group reports a status of

 

 

 

either INACTIVE or DOWN. Note that an inactive logical volume

 

 

 

in an active volume group is rare, but possible. See “Logical

 

 

 

Volume Status” on page 38.

 

 

 

 

Chapter 2

37

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HP HA s Software manual Interpreting Logical Volume Summary