Emulex 375 User Manual download pdf (Page 47)

EMULEX MODEL 375 SAN STORAGE SWITCH

USER’S GUIDE CHAPTER 3: SWITCH MANAGEMENT

EMULEX CORPORATION 44

ART NUMBER 00041369-002 REV. B

To configure multiple-switch zoning, do the following for each switch:

1. Plan which ports should belong in each zone.

2. From the One-Step Zoning page, select the appropriate ports for each zone.

3. Ensure that the Zoning Active check box is selected for both switches.

4. After making changes, click Submit.

AL_PA Zoning

AL_PA zoning is a specific zoning configuration that prevents devices from accessing one another.

AL_PA zoning fully ensures that devices will not access each other by blocking a group of devices (using

AL_PAs) from communicating with each other; however, AL_PA zoning allows the devices to

communicate with devices outside of the group.

AL_PA zoning is only accessible through the Command Line Interface (CLI). Refer to the

Emulex® or

InSpeed™ Storage Switch Products’ CLI Reference Guide

for additional information.

Recovering a Bad Zone Automatically

Bad zone recovery policy automatically recovers traffic if a device has brought down the zone. The zone

state is monitored continuously. If ports are inserted into a zone, but the zone state never transitions to

the Zone Up or Zone Active state after a set period of time (Hold Time), all devices in the pertinent zone

are bypassed and then allowed to reinsert. There is a secondary timeout, the Bad Zone Recovery Delay

Time, that can also be configured. The Bad Zone Recovery Delay Time causes a delay before ports are

allowed to reinsert, which prevents a high "thrashing" level of port insertions and de-insertions and

ensures that some devices can reset. The Bad Zone Recovery Hold Time and Delay Time threshold

settings are available on the Advanced Functions Switch Thresholds page.

When this policy is enabled with the associated PTBI policy, the device causing a zone to go down is not

allowed back into the zone due to the PTBI policy, which allows the system to return to normal operation.

The combination of the Bad Zone Recovery and PTBI policies has resulted in significant improvements

to SAN availability.

To activate bad zone recovery:

1. Click Advanced Functions > One-Step Zoning.

2. Under Bad Zone Recovery, select the check boxes for the appropriate zones.

3. Click Submit.

Caution: Clearing the Zoning Active check box will deactivate all zones, which may degrade

system performance or compromise security.

Note: The Bad Zone Recovery policy is enabled by default. If the Bad Zone Recovery policy is disabled,

use the following instructions to enable this policy for the appropriate zones.

Figure 3-18: Zones Coordinated on Multiple Switches

Switch A

Switch B

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Emulex 375 User Manual Page 47