RHEL7-Identify file systems and devices

The logical volume relies on the device mapper (DM) kernel driver. For example, there is a logical volume group in Rhel with a logic volume root, the corresponding device is/dev/rhel/root. The symbolic link/dev/rhel/root points to the/dev/dm-<number> block device node. The assignment of number is continuous, starting from 0. Each logical volume has another symbolic link in the/dev/mapper directory, named/dev/mapper/rhel-root.

Logical volumes can often be accessed using either a reliable and consistent symbolic link name, because the/dev/dm-<number> name will vary from one startup to another.

[Email protected] ~]# cd/dev/mapper/[email protected] mapper]# lltotal0CRW-------.1Root rootTen,236Jul -  One: atcontrollrwxrwxrwx.1Root root7Jul -  One: atRhel-root. /dm-0lrwxrwxrwx.1Root root7Jul -  One: atRhel-swap. /dm-1[email protected] mapper]# LVs LV VG Attr lsize Pool Origin Data% Move Log cpy%Sync Convert Root Rhel-wi-ao---- -. 50g swap Rhel-wi-ao----2. 00g [[email protected] mapper]# CD/dev/rhel/[email protected] rhel]# lltotal0lrwxrwxrwx.1Root root7Jul -  One: atRoot. /dm-0lrwxrwxrwx.1Root root7Jul -  One: atSwap-. /dm-1

View UUID

[[Email protected] ~]# Blkid/dev/sda1:uuid="ed75d4b9-6d85-4b02-8aa7-f966e78fdf85"Type="XFS"/dev/sda2:uuid="ewuqqv-n1i5-9xca-grad-2blv-qoth-vnpod2"Type="Lvm2_member"/dev/mapper/rhel-root:uuid="0a32f670-93f4-4354-8fcb-38d88d16469d"Type="XFS"/dev/mapper/rhel-swap:uuid="CC16BB7D-A65C-4510-9F77-C28759220FBC"Type="Swap" 

RHEL7-Identify file systems and devices