Troubleshooting Lvm; Troubleshooting Overview; Information Collection - HP -UX 11i Administrator's Manual

4 Troubleshooting LVM

This chapter provides conceptual troubleshooting information as well as detailed procedures to
help you plan for LVM problems, troubleshoot LVM, and recover from LVM failures. It contains the
following information:
"Troubleshooting Overview" (page 107)
"I/O Errors" (page 109)
"Volume Group Activation Failures" (page 111)
"Root Volume Group Scanning" (page 114)
"LVM Boot Failures" (page 115)
"Problems After Reducing the Size of a Logical Volume" (page 115)
"Disk Troubleshooting and Recovery Procedures" (page 116)
"Reporting Problems" (page 139)

Troubleshooting Overview

This section describes LVM troubleshooting areas and tools available for troubleshooting LVM
problems.

Information Collection

You can collect information about your LVM configuration using the vgdisplay, lvdisplay,
pvdisplay, and lvlnboot commands. As noted in
periodically collect the outputs from the commands listed in
Table 9 LVM Information to Collect and Maintain
Command
ioscan -f
lvlnboot -v
vgcfgrestore -l
vgdisplay -v
lvdisplay -v
pvdisplay -v
ioscan -m lun
In addition, use the lvmadm command for two purposes:
To determine which volume group versions are supported by your release of HP-UX 1 1i Version
3. For example, if your release supports Version 2.1 volume groups, lvmadm displays the
following:
# lvmadm -t -V 2.1
--- LVM Limits ---
VG Version
Max VG Size (Tbytes)
Max LV Size (Tbytes)
Scope
All volume groups
All volume groups
All logical volumes
All physical volumes
2.1
2048
256
"Planning for Recovery" (page
Table 9.
Purpose
Prints I/O configuration
Prints information on root, boot, swap, and dump logical
volumes.
Prints volume group configuration from the backup file.
Prints volume group information, including status of
logical volumes and physical volumes.
Prints logical volume information, including mapping
and status of logical extents.
Prints physical volume information, including status of
physical extents.
Print I/O configuration listing the hardware path to the
disk, LUN instance, LUN hardware path and lunpath
hardware path to the disk.
Troubleshooting Overview 107
34),