From d3518c17834226ef8d4a1763e6fd56561bf46c81 Mon Sep 17 00:00:00 2001
From: Paul Trowbridge <paul@hptrow.me>
Date: Mon, 16 Jan 2023 10:41:14 -0500
Subject: [PATCH] vault backup: 2023-01-16 10:41:14

---
 hard_disks.md | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/hard_disks.md b/hard_disks.md
index ce86622..c13dc3c 100644
--- a/hard_disks.md
+++ b/hard_disks.md
@@ -23,3 +23,24 @@
     UUID="86e81045-a0dc-4881-8ddb-5ef25834ea5a" /datadrive  xfs     defaults,nofail 1       2
     ```
 * somehow in the process an new systemctl service module is loaded based on fstab at runs at boot
+
+## lvm (logical volume manager)
+`vgs` to list volume groups
+`vgdisplay` to show all info for a volume group
+`lvs` to show logical volumes
+
+Given a logical volume `group` you can extend the size of a `logical volume` inside that group.
+```
+sudo lvextend -L+100G /dev/ubuntu-vg/ubuntu-lv
+```
+
+now if you do `lsblk` the size of the disk has grown but filesystem still needs to be extended as per `df`
+
+use `resize2fs` to expand the file system to take up all the disk space
+```
+ptrowbridge@usmidsap01:/var/log/postgresql$ sudo resize2fs /dev/ubuntu-vg/ubuntu-lv
+resize2fs 1.46.5 (30-Dec-2021)
+Filesystem at /dev/ubuntu-vg/ubuntu-lv is mounted on /; on-line resizing required
+old_desc_blocks = 13, new_desc_blocks = 25
+The filesystem on /dev/ubuntu-vg/ubuntu-lv is now 52428800 (4k) blocks long.
+```
\ No newline at end of file