SAN Performance issues - Use the following diagram for a step by step process for engaging with EMC support and reduce time to relief.

Goal:

To deliver faster problem resolution in order to get your environment recovered as quickly as possible. To provide a more detailed step by step process for engaging with EMC support and reduce time to relief.

There can be many reason as to why you would encounter a SAN performance issue. SAN architectures experience performance problems for a variety of reasons, including increased workloads, the addition of new applications or tools or a slow drain device and/or due to the below errors and events.

CRC Errors

Code Violation Errors

Loss of Sync

Link Resets

Logins and Log outs

Class 3 Discards

Loss of Signal

Link Failures

Exchange completion times

SCSI Reservation Conflicts

The following diagram shows the initial steps that can be carried out by the user to troubleshoot the issue.

SAN Performance Troubleshooting Flowchart:

https://support.emc.com/docu60435

If after following the above diagram and you need to open an SR with EMC please make sure have gathered an initial set of logs along with logs after the stats have been cleared.

Related KB articles:

What are the recommended (default) settings for Bottleneck Monitor, Port Fencing and the Edge Hold Time feature.https://support.emc.com/kb/14519

Cisco MDS / Nexus: Configuring Slow Drain Device Detection and Congestion Avoidance   https://support.emc.com/kb/74649

How to collect Switch Logs (master). https://support.emc.com/kb/8372

How to clear interface and ASIC counters on an Connectrix Brocade B-Series switches and Directors.https://support.emc.com/kb/203717

How to clear interface and ASIC counters on an MDS. https://support.emc.com/kb/13370