Download lv information system

'lvconvert --merge my_vg/my_lv_rimage_2' to merge back into my_lv Optional: View the logical volume after splitting the image: # lvs -a -o name,copy_percent,devices my_vg LV Copy% Devices my_lv 100.00 my_lv_rimage_0(0),my_lv_rimage_1(0) [my_lv_rimage_0] /dev/sdc1(1) [my_lv_rimage_1] /dev/sdd1(1) [my_lv_rmeta_0] /dev/sdc1(0) [my_lv_rmeta_1] /dev/sdd1(0) Merge the volume back into the array: # lvconvert --merge my_vg/my_lv_rimage_1 my_vg/my_lv_rimage_1 successfully merged back into my_vg/my_lvVerification View the merged logical volume: # lvs -a -o name,copy_percent,devices my_vg LV Copy% Devices my_lv 100.00 my_lv_rimage_0(0),my_lv_rimage_1(0) [my_lv_rimage_0] /dev/sdc1(1) [my_lv_rimage_1] /dev/sdd1(1) [my_lv_rmeta_0] /dev/sdc1(0) [my_lv_rmeta_1] /dev/sdd1(0)Additional resources lvconvert(8) man page on your system 9.17. Setting the RAID fault policy to allocate You can set the raid_fault_policy field to the allocate parameter in the /etc/lvm/lvm.conf file. With this preference, the system attempts to replace the failed device with a spare device from the volume group. If there is no spare device, the system log includes this information. Procedure View the RAID logical volume: # lvs -a -o name,copy_percent,devices my_vg LV Copy% Devices my_lv 100.00 my_lv_rimage_0(0),my_lv_rimage_1(0),my_lv_rimage_2(0) [my_lv_rimage_0] /dev/sdb1(1) [my_lv_rimage_1] /dev/sdc1(1) [my_lv_rimage_2] /dev/sdd1(1) [my_lv_rmeta_0] /dev/sdb1(0) [my_lv_rmeta_1] /dev/sdc1(0) [my_lv_rmeta_2] /dev/sdd1(0) View the RAID logical volume if the /dev/sdb device fails: # lvs --all --options name,copy_percent,devices my_vg /dev/sdb: open failed: No such device or address Couldn't find device with uuid A4kRl2-vIzA-uyCb-cci7-bOod-H5tX-IzH4Ee. WARNING: Couldn't find all devices for LV my_vg/my_lv_rimage_1 while checking used and assumed devices. WARNING: Couldn't find all devices for LV my_vg/my_lv_rmeta_1 while checking used and assumed devices. LV Copy% Devices my_lv 100.00 my_lv_rimage_0(0),my_lv_rimage_1(0),my_lv_rimage_2(0) [my_lv_rimage_0] [unknown](1) [my_lv_rimage_1] /dev/sdc1(1) [...] You can also view the system log for the error messages if

The /dev/sdb device fails. Set the raid_fault_policy field to allocate in the lvm.conf file: # vi /etc/lvm/lvm.conf raid_fault_policy = "allocate" If you set raid_fault_policy to allocate but there are no spare devices, the allocation fails, leaving the logical volume as it is. If the allocation fails, you can fix and replace the failed device by using the lvconvert --repair command. For more information, see Replacing a failed RAID device in a logical volume. Verification Verify if the failed device is now replaced with a new device from the volume group: # lvs -a -o name,copy_percent,devices my_vg Couldn't find device with uuid 3lugiV-3eSP-AFAR-sdrP-H20O-wM2M-qdMANy. LV Copy% Devices lv 100.00 lv_rimage_0(0),lv_rimage_1(0),lv_rimage_2(0) [lv_rimage_0] /dev/sdh1(1) [lv_rimage_1] /dev/sdc1(1) [lv_rimage_2] /dev/sdd1(1) [lv_rmeta_0] /dev/sdh1(0) [lv_rmeta_1] /dev/sdc1(0) [lv_rmeta_2] /dev/sdd1(0) Even though the failed device is now replaced, the display still indicates that LVM could not find the failed device because the device is not yet removed from the volume group. You can remove the failed device from the volume group by executing the vgreduce --removemissing my_vg command. Additional resources lvm.conf(5) man page on your system 9.18. Setting the RAID fault policy to warn You can set the raid_fault_policy field to the warn parameter in the lvm.conf file. With this preference, the system adds a warning to the system log that indicates a failed device. Based on the warning, you can determine the further steps. By default, the value of the raid_fault_policy field is warn in lvm.conf. Procedure View the RAID logical volume: # lvs -a -o name,copy_percent,devices my_vg LV

With size 8.00 MiB.Logical volume "test-lv_rimage_1_imeta" created.Logical volume "test-lv" created. To add DM integrity to an existing RAID LV, use the following command: # lvconvert --raidintegrity y my_vg/test-lv Adding integrity to a RAID LV limits the number of operations that you can perform on that RAID LV. Optional: Remove the integrity before performing certain operations. # lvconvert --raidintegrity n my_vg/test-lvLogical volume my_vg/test-lv has removed integrity.Verification View information about the added DM integrity: View information about the test-lv RAID LV that was created in the my_vg volume group: # lvs -a my_vg LV VG Attr LSize Origin Cpy%Sync test-lv my_vg rwi-a-r--- 256.00m 2.10 [test-lv_rimage_0] my_vg gwi-aor--- 256.00m [test-lv_rimage_0_iorig] 93.75 [test-lv_rimage_0_imeta] my_vg ewi-ao---- 8.00m [test-lv_rimage_0_iorig] my_vg -wi-ao---- 256.00m [test-lv_rimage_1] my_vg gwi-aor--- 256.00m [test-lv_rimage_1_iorig] 85.94 [...] The following describes different options from this output: g attribute It is the list of attributes under the Attr column indicates that the RAID image is using integrity. The integrity stores the checksums in the _imeta RAID LV. Cpy%Sync column It indicates the synchronization progress for both the top level RAID LV and for each RAID image. RAID image It is is indicated in the LV column by raid_image_N. LV column It ensures that the synchronization progress displays 100% for the top level RAID LV and for each RAID image. Display the type for each RAID LV: # lvs -a my-vg -o+segtype LV VG Attr LSize Origin Cpy%Sync Type test-lv my_vg rwi-a-r--- 256.00m 87.96 raid1 [test-lv_rimage_0] my_vg gwi-aor--- 256.00m [test-lv_rimage_0_iorig] 100.00 integrity [test-lv_rimage_0_imeta] my_vg ewi-ao---- 8.00m linear