User guide

ManualsBrandsRed Hat ManualsOtherENTERPRISE LINUX 4 - DM MULTIPATH

Table of Contents ............................................................................................................................ 2

1. OVERVIEW ................................................................................................................................ 3

2. DDN MULTIPATH RPM VERSIONS ............................................................................................ 3

3. INSTALLATION .......................................................................................................................... 4

3.1 RPM INSTALLATION ......................................................................................................................... 4

3.1.1 DETERMINING THE LINUX DISTRIBUTION AND VERSION ............................................................. 4

3.1.2 RPM INSTALLATION ON RHEL 5.4 – RHEL 5.6 AND SLES 10 SP2 ................................................... 5

3.1.3 RPM INSTALLATION ON RHEL 6.0 ................................................................................................. 5

3.1.4 RPM INSTALLATION ON SLES 11 ................................................................................................... 5

3.2 MERGING THE /ETC/MULTIPATH.CONF.DDN FILE .......................................................................... 6

4. ARCHITECT AND CONFIGURE YOUR DDN STORAGE ARRAY .................................................... 7

4.1 OVERVIEW OF LUN PRESENTATION PROCESS ON S2A 9900 ........................................................... 7

4.1.1 LUN PRESENTATION PROCESS ON S2A 6620 AND SFA 10000 ...................................................... 8

5. PERFORMANCE CONSIDERATIONS FOR SFA 10000 ................................................................. 9

6. ACTIVATING MULTIPATHD ..................................................................................................... 11

6.1 VERIFYING THAT MULTIPATHD SERVICE IS CONFIGURED TO AUTO-START .................................. 11

6.2 STARTING THE MULTIPATHD SERVICE ........................................................................................... 11

7. INTRODUCTION TO DM-MULTIPATH ..................................................................................... 12

7.1 HOW IT WORKS .............................................................................................................................. 12

7.2 DM-MULTIPATH COMPONENTS .................................................................................................... 13

7.3 DDN MULTIPATH RPM CONTENT .................................................................................................. 13

7.4 LINUX SCSI DEVICE ENUMERATION ............................................................................................... 14

7.5 FUNCTIONING MULTIPATH OUTPUT (ON RHEL 5 AND SLES 10) ................................................... 14

8. S2A 6620 EXAMPLE ................................................................................................................ 18

9. MULTIPATH -LL OUTPUT WITH SLES 11 AND RHEL 6 ............................................................ 19

10. KNOWN ISSUES .................................................................................................................... 20

10.1 RHEL5X/SLES10X .......................................................................................................................... 20

10.2 SLES 10X ....................................................................................................................................... 20

10.3 VARIOUS ...................................................................................................................................... 21