Red Hat ENTERPRISE LINUX 4 - LVM ADMINISTRATOR Installation Guide Page 80
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Chapter 5. LVM Configuration Examples
68
May 10 14:55:00 doc-07 lvm[19402]: vg001-mirrorlv is now in-sync
8. You can use the lvs with the -o +devices options to display the configuration of the mirror,
including which devices make up the mirror legs. You can see that the logical volume in this
example is composed of two linear images and one log.
[root@doc-07 ~]# lvs -a -o +devices
LV VG Attr LSize Origin Snap% Move Log Copy%
Convert Devices
mirrorlv vg001 mwi-a- 3.91G mirrorlv_mlog 100.00
mirrorlv_mimage_0(0),mirrorlv_mimage_1(0)
[mirrorlv_mimage_0] vg001 iwi-ao 3.91G
/dev/xvdb1(1)
[mirrorlv_mimage_1] vg001 iwi-ao 3.91G
/dev/xvdb2(1)
[mirrorlv_mlog] vg001 lwi-ao 4.00M
/dev/xvdc1(0)
You can use the seg_pe_ranges option of the lvs to display the data layout. You can use this
option to verify that your layout is properly redundant. The output of this command displays PE
ranges in the same format that the lvcreate and lvresize commands take as input.
[root@doc-07 ~]# lvs -a -o +seg_pe_ranges --segments
PE Ranges
mirrorlv_mimage_0:0-999 mirrorlv_mimage_1:0-999
/dev/xvdb1:1-1000
/dev/xvdb2:1-1000
/dev/xvdc1:0-0
Note
For information on recovering from the failure of one of the legs of an LVM mirrored volume, see
Section 6.3, “Recovering from LVM Mirror Failure”.
- Red Hat Enterprise Linux 6 1
- Logical Volume 1
- Manager Administration 1
- Administration 2
- LVM Administrator Guide 2
- Edition 1 2
- Introduction 7
- 5. We Need Feedback! 8
- 6. Document Conventions 8
- 6.2. Pull-quote Conventions 10
- 6.3. Notes and Warnings 10
- Notes and Warnings 11
- 1.1. New and Changed Features 13
- 1.2. Logical Volumes 14
- # chkconfig clvmd on 17
- # service clvmd start 17
- 1.5. Document Overview 18
- LVM Components 21
- 2.2. Volume Groups 22
- 2.3. LVM Logical Volumes 23
- 2.3.4. Snapshot Volumes 26
- LVM Administration Overview 29
- 3.4. Logical Volume Backup 30
- 3.5. Logging 31
- LVM Administration with CLI 33
- Commands 33
- 4.3.1. Creating Volume Groups 37
- 4.3.9. Removing Volume Groups 42
- # vgmerge -v databases my_vg 43
- # lvconvert -m1 vg00/lvol1 51
- # lvconvert -m0 vg00/lvol1 51
- # lvconvert --merge @some_tag 53
- # lvreduce -l -3 vg00/lvol1 54
- # lvchange -pr vg00/lvol1 54
- # lvrename vg02 lvold lvnew 54
- 4.6. Online Data Relocation 60
- 4.8.1. Format Control 61
- 4.8.2. Object Selection 63
- The vgs Command 65
- The lvs Command 66
- 4.8.3. Sorting LVM Reports 69
- 4.8.4. Specifying Units 69
- LVM Configuration Examples 71
- 5.3. Splitting a Volume Group 73
- 5.3.1. Determining Free Space 74
- 5.3.2. Moving the Data 74
- 5.4.2.3. Moving the Data 77
- LVM Troubleshooting 81
- Appendix A. The Device Mapper 91
- offsetN 94
- 0 65536 error 97
- A.2. The dmsetup Command 101
- A.2.2. The dmsetup ls Command 102
- dmsetup command 107
- B.2. Sample lvm.conf File 109
- Sample lvm.conf File 111
- Appendix C. LVM Object Tags 121
- Appendix D. LVM Volume Group 123
- Metadata 123
- D.3. Sample Metadata 124
- Sample Metadata 125
- Appendix E. Revision History 127
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