System requirements

Direct I/O support is a platform-dependent feature that is currently available on Solaris SPARC, Windows, IBM AIX, and Linux.

**Table 1-1: Windows server system requirements for Windows x86 and 64-bit systems**
Operating system	Hardware	Supported protocols
Windows 2003 Standard, Enterprise, and Datacenter Editions, SP2	Intel Xeon EM64T AMD Opteron	TCP IPX/SPX Named pipes (not supported for LDAP server connections
Windows XP Professional SP1 or higher	Intel Xeon EM64T AMD Opteron	TCP IPX/SPX Named pipes (not supported for LDAP server connections
Windows Vista	Intel Xeon EM64T AMD Opteron	TCP IPX/SPX Named pipes (not supported for LDAP server connections
	Memory needed for 32-bits
Minimum RAM required	80MB
Minimum RAM per additional user	156KB	With default stack size, packet size, and user log cache size. This value depends on the connection needs. See the System Administration Guide for information about configuring memory.
Default user stack size	41K
	Memory needed for 64-bits
Minimum RAM required	127MB
Minimum RAM per additional user	83KB	With default stack size, packet size, and user log cache size. This value depends on the connection needs. See the System Administration Guide for information about configuring memory.
Default user stack size	73K