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Trouble Shooting
How to access system memory in excess of 4GB for Microsoft
Windows 2000 Advanced Server and Datacenter Server
Microsoft Windows 2000 Advanced Server and Datacenter Server support memory in
excess of 4GB of RAM by way of the Intel Physical Addressing Extension (PAE)
specification. Windows 2000 Advanced Server is limited to 8GB, and Windows 2000
Datacenter Server is limited to 64GB.
You can enable PAE in the "Boot.ini" file. To enable PAE, follow these steps:
1.
Locate the Boot.ini file, typically in the root folder (for example, C:) and
remove its read-only attribute.
2.
Open the Boot.ini file, and then add the /PAE parameter to the ARC path, as
shown in bold format in the following example:
multi(0)disk(0)rdisk(0)partition(2)\WINNT= "Windows 2000 Advanced
Server" /PAE /basevideo /sos
3.
On the File menu, click Save.
4.
Restore the read-only attribute to the Boot.ini file.
Even with PAE enabled, the underlying architecture of the system is still based on
32-bit linear addresses. This effectively retains the 2GB of application space and the
2GB of kernel mode space because only 4GB of addresses are available. However,
multiple processes can immediately benefit from the increased RAM because they are
less likely to encounter physical memory restrictions and begin paging. Additionally,
applications can be modified to use the AWE API to allocate memory outside of the
applications process space, bypassing the 2-GB limit for applications.
A-3
User's Manual
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