SCSI Miniport AlignmentMask Restrictions

ID: Q153264

The information in this article applies to:

Microsoft Win32 Device Driver Kit (DDK) for Windows NT, versions 3.5, 3.51

SUMMARY

SCSI miniport drivers indicate the alignment restrictions of scatter/gather buffer pointers in the AlignmentMask field of the PORT_CONFIGURATION_INFORMATION structure. The maximum alignment supported by Windows NT is 0x7. This setting yields cache-aligned buffers.

In theory, a larger AlignmentMask could be specified by the SCSI miniport, but the file systems layered above the driver cannot honor the alignment request, so they will eventually fail.

MORE INFORMATION

Refer to the Windows NT Device Driver Kit documentation for details on SCSI miniport design.

Additional query words: 3.50


Keywords          : ntddkstorage 
Version           : 3.50
Platform          : NT WINDOWS 
Issue type        :

Last Reviewed: March 4, 1999