XFS File System Technology Journaled 64-bit file system for IRIX(tm), with guaranteed file system consistency Product Span Available as a layered product on all systems which run IRIX 5.3 or later, except IP4 and IP6 platforms Max. File Size 1TB at first release, future releases support 9 million TB or the system drive limits Max. File System Size 1TB at first release, future releases support 18 million TB or the system drive limits File System Block Size Selectable at file system creation time using mkfs_512, 512 bytes to 64KB for normal data, and up to 1MB for real-time data File system extents (contiguous data) are configurableat file creation time using fcntl and are multiples of the file system block size Physical Disk Sector Size Supported 512 Bytes NFS Compatibility Using NFS 5.3, 64-bit file systems can be exported to other systems which support the NFS V3 Protocol Systems which use NFS V2 protocol may access XFS file systems within the 32-bit limit imposed by the protocol EFS Interoperability EFS and XFS filesystems can be active on a single computer system Backup/Restore Dump/restore, bru, cpio, tar; IRIS NetWorker(tm) for IRIX Dump Interchangeability Restore can restore EFS dumps to either EFS or XFS file systems xfs_restore can restore XFS dumps to either XFS or EFS file systems EFS file systems are dumped in EFS format, XFS file systems are dumped in XFS format Dumps of active XFS file systems are possible Support for Hierarchical Storage Data Management API (DMIG) allows implementation of hierachial storage management software with no kernal modifications as well as high-performance dump programs without requiring "raw" access to the disk and knowledge of filesystem structures. Swap to Files Swap to files is supported Guaranteed Rate I/O * Hard and soft guarantees are supported, hard guarantees require turning off disk-drive self diagnostics Guarantees are expressed as a file descriptor, data rate, duration, and start time Performance Superior to EFS Memory 32MB recommended XFS Options Guaranteed I/O for more than 4 streams

XLV Volume Management Topology Support Mirroring, striping, concatenation supported. Each volume can contain 3 subvolumes: real-time, log, and data File system journal can be stored on a separate partition for maximum performance Separate real-time partition for XFSfilesystems. Maximum Disks per File System Each sub volume can be independently mirrored up to 4 copies, striped up to 128 ways, and concatenated up to 100 volume extents (note: there may be hardware imposed limits) Root Partition Root partitions can be mirrored. Striping and device concatenation of root partitions is not supported at first release /usr partition mirroring, striping, and concatenationare available for the /usr partitions as for any other (non-root) file system Dynamic Change Add or remove a mirror, grow a volume, replace failed elements of a mirrored volume XLV Options * File system mirroring. Striping and concatenation are provided with base software

* denotes unbundled product