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EMC QLA22xx User Manual

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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.
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.)
Table 3-1
Server Response to Failure in the Boot LUN Path (Single Fault)
Configuration
Server State
HBA Failure
Switch Failure
Boot 
SP/Director 
Port Failure
Boot 
SP/Director 
Failure
Catastrophic 
Storage 
System Failure
2 or more HBAs, 
failover software
Windows running
Multipath
STOP error 
Multipath
Trespass 
STOP error
Windows booting
Halt
Halt
Halt
Halt
Halt
Power up
Multipath
Multipath
Manual
No Boot
1 HBA, failover 
software
Windows running
STOP error
STOP error
Trespass
Trespass 
STOP error
Windows booting
Halt
Halt
Halt
Halt
Halt
Power up
No boot
No boot
Manual
Manual
No boot
1 HBA, no 
failover software
Windows running
STOP error
STOP error
STOP error
STOP error
STOP error
Windows booting
Halt
Halt
Halt
Halt
Halt
Power up
No boot
No boot
No boot
No boot
No boot