Configuring an EMC Boot Device

How a Server Responds to Failure in the Boot LUN Path

Failure in the path to a SAN-based boot LUN can halt Windows in a fatal error condition. Depending on the failure, Windows may be able to transfer control to another path and continue.

Table 3-1 shows server reactions to failures in different components.

 

 

Table 3-1

Server Response to Failure in the Boot LUN Path (Single Fault)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Boot

Boot

Catastrophic

 

 

 

 

 

 

 

 

 

SP/Director

SP/Director

Storage

 

 

Configuration

Server State

 

HBA Failure

 

Switch Failure

 

Port Failure

Failure

System Failure

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2 or more HBAs,

Windows running

Multipath

 

STOP error a

 

Multipath

Trespass b

STOP error

 

 

failover software

 

 

 

 

 

 

 

 

 

 

 

Windows booting

Halt

 

Halt

 

Halt

Halt

Halt

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Power up

 

Multipath

 

No Boot a

 

Multipath

Manual

No Boot

 

 

1 HBA, failover

Windows running

STOP error

 

STOP error

 

Trespass

Trespass b

STOP error

 

 

software

 

 

 

 

 

 

 

 

 

 

 

Windows booting

Halt

 

Halt

 

Halt

Halt

Halt

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Power up

 

No boot

 

No boot

 

Manual

Manual

No boot

 

 

 

 

 

 

 

 

 

 

 

 

 

1 HBA, no

Windows running

STOP error

 

STOP error

 

STOP error

STOP error

STOP error

 

 

failover software

 

 

 

 

 

 

 

 

 

 

 

Windows booting

Halt

 

Halt

 

Halt

Halt

Halt

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Power up

 

No boot

 

No boot

 

No boot

No boot

No boot

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

a. Depending on the fabric configuration, if multiple switches are used, then this behavior would

 

 

 

 

 

qualify under the Multipath category.

 

 

 

 

 

 

 

 

b. CLARiiON only.

 

 

 

 

Explanations of Entries

STOP Error (fatal blue screen) — Indicates host failure and

 

 

 

 

 

chance of data corruption.

 

 

 

 

 

 

 

No boot — Cannot boot Windows.

 

 

 

 

 

 

Halt — Windows cannot recover before system has completed

 

 

 

 

 

startup. (You must reboot and follow the power-up scenario.)

 

 

 

 

Manual — Manual intervention is required to continue.

 

 

 

 

 

(Typically, initiate a LUN trespass using CLI or Manager. With

 

 

 

 

 

Manager, enable LUN Auto-Assignment in LUN properties.)

 

 

 

 

Multipath or Trespass — This automatic operation allows no

 

 

 

 

 

disruption of service. (The delay caused by this operation may

 

 

 

 

 

affect Windows stability.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

How a Server Responds to Failure in the Boot LUN Path

3-37

 

 

 

 

 

 

 

 

 

 

 

 

3

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EMC QLogic manual How a Server Responds to Failure in the Boot LUN Path, Explanations of Entries

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