| NAME | Function |
|---|---|
| INCORE | File location (disk or memory) |
| IEXIST | Use existing file |
| IFKEEP | Keep files |
| IREST | Write restart information |
| IOLAST | Write to end of file on open |
| IOKIDS | Open for access by children |
| NUMIOQ | Number if I/O queues |
| NUMSTP | Number of stripes per queue |
| NUMVOL | Number of volumes per stripe |
| MBYTES | Number of megabytes per volume |
| IOTYPE | Perform raw or direct I/O |
| IOMASK | Bind FMSDISK thread to CPU cores |
| IOWARN | Special I/O warning options |
| IOSYNC | Perform synchronous I/O |
| LSECTR | Disk sector length (8-byte words) |
| NOOPEN | Do not physically open files |
| LBUFSI | Buffer size for submatrix integer records |
| LBUFSR | Buffer size for submatrix real records |
| LBUFSV | Buffer size for submatrix vector records |