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--- linux:general:lvm [2018/12/20 17:42] – Discussion status changed lunetikk
+++ linux:general:lvm [2020/11/16 17:39] (current) – lunetikk
@@ Line 35: / Line 35: @@
 <code>
 pvcreate /dev/sdb1
-vgcreate data /dev/sdb1
+vgcreate datavg /dev/sdb1
-lvcreate -l 100%FREE -n backup data
+lvcreate -l 100%FREE -n backuplv datavg
-mkfs.ext3 -Ldata /dev/data/backup
+mkfs.ext3 -Lbackup /dev/datavg/backuplv
-#mkfs.xfs -Ldata /dev/data/backup
+#mkfs.xfs -Lbackup /dev/datavg/backuplv
 vi /etc/fstab
-/dev/mapper/data-backup /data                    ext3     defaults        0 0
+/dev/mapper/datavg-backuplv /data                    ext3     defaults        0 0
+</code>
+=== Extend Physical Volume (PV) ===
+Get the "PV Name"/ Partition via
+<code>pvdisplay
+  --- Physical volume ---
+  PV Name               /dev/sdc1
+  VG Name               datavg
+  PV Size               <600.00 GiB / not usable 2.00 MiB
+...
+</code>
+(Resize VMDK to 1,3TB) Check if your disk resize has already been recognized via
+<code>cat /proc/partitions
+major minor  #blocks  name
+...
+       32  629145600 sdc
+       33  629144576 sdc1
+...
+</code>
+sdc is not 1,3TB, so get the scsi target via
+<code>lsscsi -v
+...
+[2:0:0:0]    disk    VMware   Virtual disk     1.0   /dev/sdc
+  dir: /sys/bus/scsi/devices/2:0:0:0  [/sys/devices/pci0000:00/0000:00:17.0/0000:13:00.0/host2/target2:0:0/2:0:0:0]
+...
+</code>
+Then rescan the adapter
+<code>echo 1 > /sys/class/scsi_disk/2\:0\:0\:0/device/rescan</code>
+The OS now knows that the disk has 1,3TB
+<code>cat /proc/partitions
+major minor  #blocks  name
+...
+       32 1395864371 sdc
+       33  629144576 sdc1
+...
+</code>
+Resize the partition (see Create new Physical Volume (PV))\\
+The partitiontable might have an old state, to refresh it try the following commands
+<code>partprobe
+kpartx -a /dev/sdc
+partx -a /dev/sdc
+</code>
+Looking at /proc/partitions should now list sdc and sdc1 with 1,3TB, if not you should restart your VM to refresh the table.\\
+If both sdc and sdc1 are up to date, resize the PV
+<code>pvresize -v -d /dev/sdc1
+    Archiving volume group "datavg" metadata (seqno 7).
+    Resizing volume "/dev/sdc1" to 2791726694 sectors.
+    Resizing physical volume /dev/sdc1 from 153599 to 340786 extents.
+    Updating physical volume "/dev/sdc1"
+    Creating volume group backup "/etc/lvm/backup/datavg" (seqno 8).
+  Physical volume "/dev/sdc1" changed
+physical volume(s) resized or updated / 0 physical volume(s) not resized
+</code>
+pvdisplay and vgdisplay are now resized
+<code>pvdisplay
+ --- Physical volume ---
+  PV Name               /dev/sdc1
+  VG Name               datavg
+  PV Size               <1.30 TiB / not usable <2.80 MiB
+vgdisplay
+  --- Volume group ---
+  VG Name               datavg
+  ...
+  VG Size               <1.30 TiB
 </code>
 === Extend Logical Volume (LV) ===
-Create a new partition for free space (example above)\\
+Extend the disk (PV/VG, example above)\\
-Then extend the LV
+Then extend the LV (100% is the full VG, check the "Other commands"-section for other parameters)
 <code>
-pvcreate /dev/sdb1
-vgextend data /dev/sdb1
 lvextend -l +100%FREE /dev/data/backup
+#if ext3/4 use
 resize2fs /dev/data/backup
+#if xfs use
+xfs_growfs /dev/data/backup
 </code>
@@ Line 72: / Line 156: @@
 |  lvdisplay   |  show all LVs  |\\
 |  vgchange -ay <VGNAME>  |  activate LV  |\\
+|  vgextend datavg /dev/sdd  |  add disk sdd (unpartitioned) to VG datavg  |\\
 |  lvextend -L+5G /dev/data/backup  |  extend by 5GB  |\\
+|  lvextend -L 10G /dev/data/backup  |  extend to 10GB total  |\\
+|  lvcreate -L20G -n backuplv datavg  |  create LV with 20GB total  |\\
+|  lvresize -r -L+5G /dev/data/backup  |  extend by 5GB and do resize2fs/ xfs_growfs  |\\
 === Useful links ===
@@ Line 79: / Line 167: @@
 [[https://www.turnkeylinux.org/blog/extending-lvm|turnkeylinux.org - extend lvm]]
+==== Troubleshooting ====
+=== Cant mount a logical volume ===
+__**Description**__
+Mounting the device leads to the following error
+<code>
+mount: special device /dev/mapper/VG01-LVbackup does not exist
+</code>
+Checking the LV via "lvdisplay" shows that its unavailable
+<code>
+LV Status              NOT available
+</code>
+__**Reason**__
+Its deactivated.
+Maybe you are missing the services in autostart? check /etc/boot.d/ for the following services and add them if needed:
+<code>
+chkconfig boot.lvm on
+chkconfig boot.lvm_monitor on
+</code>
+__**Fix**__
+Run the following command to activate it
+<code>vgchange -ay <VGNAME></code>
+and remount
+<code>mount <PATH></code>
 \\
+=== New added disk doesnt appear in /proc/partitions ===
+__**Description**__
+After adding a new disk to your VM the disk doesnt appear in /proc/partition
+__**Reason**__
+The VM didnt rescan the scsi devices
+__**Fix**__
+Run the following command rescan the scsi hosts for new devices
+<code>for host in /sys/class/scsi_host/*; do echo "- - -" | sudo tee $host/scan; lsblk -S ; done</code>
 \\
 ~~DISCUSSION:closed~~

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