| PowerPath Troubleshooting Procedures | | | | ------ --- Queued --- ## Switch Name Summary Total |
| EMC's PowerPath is host-based software that works | | | | Closed IOs Blocks |
| in conjunction with Symmetrix. PowerPath enhances | | | | == 0 Enabled sbus@2/QLGC,isp@2 Optimal 38 0 0 0 |
| Symmetrix capabilities by providing automatic | | | | 1 Enabled sbus@3/QLGC,isp@0 Optimal 38 0 0 0 |
| detection of and recovery from host-toSymmetrix | | | | 2 Enabled sbus@7/QLGC,isp@0 Optimal 38 0 0 0 |
| connection failures. PowerPath enhances I/O | | | | 3 Enabled sbus@6/QLGC,isp@2 Degraded 38 0 0 0 |
| performance by load balancing I/O requests across | | | | 3. Examine the output in /var/adm/messages |
| multiple I/O channels. | | | | 4. Execute: /opt/EMCpower/bin/powermt restore |
| PowerPath is a thin (efficient) software layer that | | | | 5. Check the status of the channels & drives ( |
| takes advantage of Symmetrix's multipathing | | | | opt/EMCpower/bin/powermt display) |
| capabilities. It gives a host system the ability to | | | | # /opt/EMCpower/bin/powermt display total |
| manage multiple paths to a single device. After | | | | emcpower devices: 38, highest device number: 37 |
| PowerPath is installed and configured, usage of | | | | == ------------ Adapters ------------ ----- Device Paths |
| PowerPath is no different than usage of a standard | | | | ------ --- Queued --- ## Switch Name Summary Total |
| disk device. From that point forward PowerPath is | | | | Closed IOs Blocks |
| constantly in use unless consciousefforts are made to | | | | == |
| disable it. | | | | 0 Enabled sbus@2/QLGC,isp@2 Optimal 38 0 0 0 |
| 1. Become root on the host experiencing the problem. | | | | 1 Enabled sbus@3/QLGC,isp@0 Optimal 38 0 0 0 |
| 2. Execute the command: /opt/EMCpower/bin | | | | 2 Enabled sbus@7/QLGC,isp@0 Optimal 38 0 0 0 |
| powermt display | | | | 3 Enabled sbus@6/QLGC,isp@2 Optimal 38 0 0 0 |
| # /opt/EMCpower/bin/powermt display total | | | | 6. If the status has not returned to "Optimal" then |
| emcpower devices: 38, highest device number: 37 | | | | escalate the problem. |
| == ------------ Adapters ------------ ----- Device Paths | | | | |