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Table of contents
3 Dell EMC SC Series: Red Hat Enterprise Linux Best Practices | CML1031
Table of contents
Revisions............................................................................................................................................................................. 2
Acknowledgements ............................................................................................................................................................. 2
Table of contents ................................................................................................................................................................ 3
Executive summary ............................................................................................................................................................. 6
1 Overview ....................................................................................................................................................................... 7
2 Server configuration ..................................................................................................................................................... 8
2.1 Managing the HBA driver module ....................................................................................................................... 8
2.1.1 Managing the queue depth ................................................................................................................................. 8
2.1.2 Setting the HBA port timeout .............................................................................................................................. 9
2.1.3 Reloading modprobe .......................................................................................................................................... 9
2.1.4 Rebuilding the initial ramdisk image ................................................................................................................. 10
2.1.5 Verifying the parameters .................................................................................................................................. 10
2.2 SCSI device command timeout ........................................................................................................................ 11
2.3 Serial-attached SCSI ........................................................................................................................................ 11
2.3.1 SAS drivers ....................................................................................................................................................... 12
2.3.2 FC/iSCSI and SAS............................................................................................................................................ 12
2.3.3 SAS queue depth.............................................................................................................................................. 12
2.3.4 Boot-from-SAS .................................................................................................................................................. 12
2.4 Software iSCSI ................................................................................................................................................. 12
2.4.1 Configuration .................................................................................................................................................... 13
2.4.2 Initializing and configuring iSCSI ...................................................................................................................... 13
2.4.3 Scanning for new volumes ............................................................................................................................... 14
2.4.4 iSCSI timeout .................................................................................................................................................... 15
2.4.5 Filesystem on iSCSI volume ............................................................................................................................. 15
3 Volume management ................................................................................................................................................. 16
3.1 Identifying HBAs on the Linux system .............................................................................................................. 16
3.1.1 FC HBAs ........................................................................................................................................................... 16
3.1.2 iSCSI HBAs ...................................................................................................................................................... 17
3.1.3 SAS HBAs ........................................................................................................................................................ 17
3.1.4 Creating a server object in DSM using the Linux HBA information .................................................................. 17
3.2 Discovering and identifying SC Series volumes on a Linux system ................................................................. 18
3.2.1 Scanning for LUNs............................................................................................................................................ 18
3.2.2 Identifying LUNs by WWNs .............................................................................................................................. 19
3.2.3 Querying WWNs using scsi_id command ........................................................................................................ 20