notes/hard_disks.md

RAID edits

• Enter the system setup menu at boot time, then you also have to press additional keys to get to the RAID screen
• create a new virtual disk and assign the new disks, then initialize the VD

Mounting the new VD

• find the disk with fdisk -l | grep '^Disk'
• create a partition table
  • fdisk /dev/sdb
  • p to list partition table if any
  • n to create a new partition
  • w to write the new partition
• format the new partition with mkfs.ext4 /dev/sdb1
• create an access folder, maybe at //mnt/backup
• run the mount mount /dev/sdb1 /mnt/backup
• edit fstab by adding
  • using device name

  //dev/sdb1  /mnt/backup ext4    defaults    1   2
  

  • using UUID (do sudo blkid to get the UUID)

  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.