Thursday, July 26, 2007

What is Physical Address Extension (PAE) and its relevance with Exchange 2003?

Reply 1)

Microsoft has improved memory management for Exchange through techniques such as Dynamic Buffer Allocation within the Exchange Server 2003 Informaton store. However, Exchange developers still must depend on the underlying hardware and OS to effectively use memory. And since we don’t yet have a 64-bit version of Exchange, Exchange is limited to 4GB of address space.However, recent OS and hardware advances help Exchange make the most of 32-bit.

Physical Address Extension (PAE) is a hardware technology that lets windows applications on IA-32 servers address more than 4 GB of physical memory.PAE actually uses 36 bits to create additional addressable memory. PAE lets an OS memory manager use a three-level address-translation scheme to access memory above the 2 GB or 3 GB available on servers that don’t use PAE.

For more information refer the following link- . . .

Reply 2)

The PAE switch is applied in the BOOT.ini file at the end of the OS line

It operates in 2 modes, /PAE (turns PAE on) and /NOPAE (turns PAE off).

PAE was disabled by default in Windows 2003 RTM, but was enabled by default with SP1.


Post a Comment

Subscribe to Post Comments [Atom]

<< Home