Product data

DotHill – Linux Device Mapper Multipath “How To” for Storage Revision 4

Contents

1 Scope........................................................................................................................ 4

2 Quick Start................................................................................................................ 4

3 Introduction.............................................................................................................. 5

3.1 Features of DM-MP .................................................................................. 5

3.2 Software components of DM-MP............................................................ 6

4 Theory of Operation................................................................................................. 6

4.1 Terms and Concepts ............................................................................... 7

5 Installing DM-MP...................................................................................................... 8

5.1 RedHat Linux 4......................................................................................... 8

5.1.1 Multipath Setup.................................................................................. 8

5.2 RedHat Linux 5......................................................................................... 9

5.3 SUSE Linux 9 ...........................................................................................9

5.4 SUSE Linux 10 .........................................................................................9

6 Configuration ........................................................................................................... 9

6.1 Configuring the DotHill storage array for Multipathing........................ 9

6.2 Configuring DM-MP with the multipath.conf file............................10

6.3 Multipath.conf (Additional Detail).........................................................11

6.3.1 System defaults (defaults)........................................................... 11

6.3.2 Blacklisted devices (devnode_blacklist).................................. 12

6.3.3

Per-storage-array (devices) .......................................................... 12

6.3.4 Per-device settings (multipaths)................................................. 13

6.3.5 Unified Lun (ULP) settings (devices) ........................................... 14

6.4 Multipath.conf (Recommended DotHill Storage Settings) ................. 14

6.4.1 SANnet II...........................................................................................14

6.4.2 R/Evolution 2730 / 5730................................................................... 15

6.4.3 R/Evolution 5730 (with ULP)........................................................... 15

6.4.4 R/Evolution 2330.............................................................................. 16

6.4.5 R/Evolution 2330 (with ULP).......................................................... 16

6.4.6 R/Evolution 2530.............................................................................. 17

7 Configuring Host Bus Adapters ........................................................................... 17

7.1 Configuring QLogic HBA parameters .................................................. 18

7.2 Configuring QLogic/Emulex HBAs for R/Evolution storage .............. 18

8 Managing DM-MP Devices ....................................................................................18

9 Known Issues......................................................................................................... 20

10 Appendix A - multipath.conf.annotated file......................................................... 22