Seagate ST34572WC Specifikace Strana 7
- Strana / 67
- Tabulka s obsahem
- KNIHY
Hodnocené. / 5. Na základě hodnocení zákazníků
7
disks in any volume group leads to a more complex LVM configuration, which will be more difficult
to recreate after a catastrophic failure. Finally, a small root volume group is quickly recovered. In
some cases, you can reinstall a minimal system, restore a backup, and be back online within three
hours of diagnosis and replacement of hardware.
Three disks in the root volume group are better than two due to quorum restrictions. With a two-disk
root volume group, a loss of one disk can require you to override quorum to activate the volume
group; if you must reboot to replace the disk, you must interrupt the boot process and use the –lq
boot option. If you have three disks in the volume group, and they are isolated from each other
such that a hardware failure only affects one of them, then failure of only one disk enables the
system to maintain quorum.
• Keep your other volume groups small, if possible. Many small volume groups are preferable to a
few large volume groups, for most of the same reasons mentioned previously. In addition, with a
very large volume group, the impact of a single disk failure can be widespread, especially if you
must deactivate the volume group. With a smaller volume group, the amount of data that is
unavailable during recovery is much smaller, and you will spend less time reloading from backup. If
you are moving disks between systems, it is easier to track, export, and import smaller volume
groups. Several small volume groups often have better performance than a single large one. Finally,
if you ever have to recreate all the disk layouts, a smaller volume group is easier to map. Consider
organizing your volume groups so that the data in each volume group is dedicated to a particular
task. If a disk failure makes a volume group unavailable, then only its associated task is affected
during the recovery process.
• Maintain adequate documentation of your I/O and LVM configuration, specifically the outputs from
the following commands:
Command
Scope
Purpose
ioscan –f
Print I/O configuration
lvlnboot -v
for all volume
groups
Print information on root, boot, swap, and dump
logical volumes
vgcfgrestore –l
for all volume
groups
Print volume group configuration from backup file
vgdisplay –v
for all logical
volumes
Print volume group information, including status of
logical volumes and physical volumes
lvdisplay –v
for all logical
volumes
Print logical volume information, including
mapping and status of logical extents
pvdisplay –v
for all physical
volumes
Print physical volume information, including status
of physical extents
ioscan –m lun
(11i v3 onwards)
Print I/O configuration listing the hardware path
to the disk, LUN instance, LUN hardware path
and lunpath hardware path to the disk
With this information in hand, you or your HP support representative may be able to reconstruct a
lost configuration, even if the LVM disks have corrupted headers. A hard copy is not required or
even necessarily practical, but accessibility during recovery is important and you should plan for
this.
Make sure that your LVM configuration backups are up-to-date. Make an explicit configuration
backup using the vgcfgbackup command immediately after importing any volume group or
activating any shared volume group for the first time. Normally, LVM backs up a volume group
configuration whenever you run a command to change that configuration; if an LVM command
prints a warning that the vgcfgbackup command failed, be sure to investigate it.
- Under LVM 1
- Abstract 3
- Background 3
- Defining a Recovery Strategy 4
- Using Hot-Swappable Disks 4
- Creating Recovery Media 6
- I/O Errors in the System Log 9
- LVM Command Errors 10
- 3. Confirming Disk Failure 12
- 5. Removing the Disk 18
- Disk Replacement Scenarios 25
- 0/1/1/1.0x3.0x0 31
- 0/1/1/1.0x3.0x0 33
- Disk Replacement Flowchart 39
- Conclusion 42
- Configuration Files 46
- Appendix D: Procedures 48
- LVM Command Error Messages 54
- Syslog Error Messages 60
- Hardware Path 66
- For more information 67
- Call to Action 67
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