Release Notes

Linux setup and configuration

16 Dell EMC PowerVault ME4 Series and Linux | 3924-BP-L

3 Linux setup and configuration

The following subsections describe best practices when working with ME4 Series arrays on Linux operating

systems. This paper uses Red Hat Enterprise Linux to illustrate various Linux setup and configuration tasks.

3.1 Discover and identify ME4 Series volumes

After creating and enabling host access of the LUNs in the ME4 Series system, the host operating system

needs to scan for these new LUNs before they can be used. On Linux, install the following rpm packages

which contain useful utilities to discover and identify LUNs: sg3_utils, lsscsi, and blkid.

3.1.1 Scan and identify new volumes on Linux

New volumes are added to the Linux host by scanning the SCSI buses that have access to the ME4 Series

system. The sg3_utils package provides the rescan-scsi-bus.sh script that helps simplify the process. It is

recommended to scan for all targets. The following command works for all LUNs except for LUN 0. See

section 3.1.2 for information on scanning LUN 0.

# /usr/bin/rescan-scsi-bus.sh -a

3.1.2 Scan LUN 0

By default, LUN 0 is assigned to the ME4 Series system. This assignment is completed as soon as the host

has visibility to the ME4 Series system (for example, when FC zones are created for the host and ME4 Series

system, or when the host iSCSI initiator logs in to ME4 Series iSCSI ports). Therefore, the very first volume

mapped to the Linux host starts with LUN ID 1.

# lsscsi -is

[0:0:0:0] cd/dvd QEMU QEMU DVD-ROM 0.10 /dev/sr0 - -

[6:0:0:0] enclosu DellEMC ME4 G275 - - -

[6:0:0:1] disk DellEMC ME4 G275 /dev/sdl