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--- linux:resize_disk [2021/11/11 12:49]
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+++ linux:resize_disk [2021/11/11 13:12] (current)
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 ===== Disk without partitions =====
+Find the paths to the LUN:
+<cli prompt='#'>
+# multipath -ll
+[...]
+   mpathc (200255c3a11080003) dm-38 NEC,DISK ARRAY
+   size=120G features='1 queue_if_no_path' hwhandler='1 alua' wp=rw
+   |-+- policy='round-robin 0' prio=50 status=active
+   | |- 1:0:2:0 sdm 65:32 active ready running
+   | `- 2:0:2:0 sdo 65:64 active ready running
+   `-+- policy='round-robin 0' prio=10 status=enabled
+     |- 1:0:3:0 sdn 65:16 active ready running
+     `- 2:0:3:0 sdp 65:48 active ready running
+</cli>
+Rescan the paths:
+<cli prompt='#'>
+# echo 1 > /sys/block/sdm/device/rescan
+# echo 1 > /sys/block/sdo/device/rescan
+# echo 1 > /sys/block/sdn/device/rescan
+# echo 1 > /sys/block/sdp/device/rescan
+</cli>
+# Resize the multipath device:
+<cli prompt='#'>
+# multipathd -k 'resize map mpathc'
+</cli>
+Now if you have an unpartitionned disk, just rezise the pv and vg
+<cli prompt='#'>
+# partprobe -s
+# pvresize /dev/mpathc
+</cli>
+<cli prompt='#'>
+# vgresize myvg
+</cli>
+Else use one of the next steps
 ===== Disk with partitions =====
+==== Add a new partition on the disk ====
+**This is the most safe way**
+<cli prompt='#'>
+# fdisk /dev/mpathc
+</cli>
+<code>
+   The number of cylinders for this disk is set to 2480.
+   There is nothing wrong with that, but this is larger than 1024,
+   and could in certain setups cause problems with:
+) software that runs at boot time (e.g., old versions of LILO)
+) booting and partitioning software from other OSs (e.g., DOS FDISK, OS/2 FDISK)
+   Command (m for help): p
+   Disk /dev/mpathc: 20.4 GB, 20401094656 bytes
+heads, 63 sectors/track, 2480 cylinders
+   Units = cylinders of 16065 * 512 = 8225280 bytes
+   Device Boot      Start         End      Blocks   Id  System
+   /dev/mpathc1   *           1          33      265041   83  Linux
+   /dev/mpathc2              34        1958    15462562+  8e  Linux LVM
+# Let's create a new partition. In our case, we'll create partition # 3
+# (primary Linux LVM partition). For the first and last cylinder usually default values
+# will be ok; if not, choose carefully the beginning and the end of the new partition to
+# avoid
+   Command (m for help): n
+   Command action
+   e   extended
+   p   primary partition (1-4)
+   p
+   Partition number (1-4): 3
+   First cylinder (1959-2480, default 1959):
+   Using default value 1959
+   Last cylinder or +size or +sizeM or +sizeK (1959-2480, default 2480):
+   Using default value 2480
+   Command (m for help): t
+   Partition number (1-4): 3
+   Hex code (type L to list codes): 8e
+   Changed system type of partition 3 to 8e (Linux LVM)
+   Command (m for help): w
+   The partition table has been altered!
+   Calling ioctl() to re-read partition table.
+   WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
+   The kernel still uses the old table.
+   The new table will be used at the next reboot.
+   Syncing disks.
+</code>
+Rescan disks
+<cli prompt='#'>
+# partprobe -s
+</cli>
+If you get a warning: Warning: WARNING: the kernel failed to re-read the partition table on /dev/sdc (Device or resource busy).
+As a result, it may not reflect all of your changes until after reboot.
+The use following command instead:
+<cli prompt='#'>
+# partx -a /dev/mpathc
+</cli>
+Then you can add the new partition to the VG
+<cli prompt='#'>
+# vgextend myvg /dev/mpathc3
+</cli>
 ==== How to use growpart to resize your partition online (disk) ====

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