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<TITLE>XFS - File System Technical Specifications</TITLE>
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<P><B>XFS File System</B> 
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<DT>Technology 
<DD>Journaled 64-bit file system for IRIX(tm), with guaranteed file system consistency 
<DT>Product Span 
<DD>Available as a layered product on all systems which run IRIX 5.3 or later, except IP4 and IP6 platforms 
<DT>Max. File Size 
<DD>1TB at first release, future releases support 9 million TB or the system drive limits 
<DT>Max. File System Size 
<DD>1TB at first release, future releases support 18 million TB or the system drive limits 
<DT>File System Block Size 
<DD>Selectable at file system creation time using mkfs_512, 512 bytes to 64KB for normal data, and up to 1MB for real-time data 
<P>File system extents (contiguous data) are configurableat file creation time using <i>fcntl</i> and are multiples of the file system block size 
<DT>Physical Disk Sector Size Supported 512 Bytes 
<DD>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 
<DT>EFS Interoperability 
<DD>EFS and XFS filesystems can be active on a single computer system 
<DT>Backup/Restore 
<DD>Dump/restore, bru, cpio, tar; IRIS NetWorker(tm) for IRIX 
<DT>Dump Interchangeability 
<DD>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 
<DD>EFS file systems are dumped in EFS format, XFS file systems are dumped in XFS format 
<DD>Dumps of active XFS file systems are possible 
<DT>Support for Hierarchical Storage 
<DD>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.
<DT>Swap to Files 
<DD>Swap to files is supported 
<DT>Guaranteed Rate I/O <i>*</i>
<DD>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 
<DT>Performance 
<DD>Superior to EFS 
<DT>Memory 
<DD>32MB recommended 
<DT>XFS Options 
<DD>Guaranteed I/O for more than 4 streams 
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<P><B>XLV Volume Management</B> 
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<DT>Topology Support 
<DD>Mirroring, striping, concatenation supported.
<dd>Each volume can contain 3 subvolumes: real-time, log, and data
<dd>File system journal can be stored on a separate partition for maximum performance
<dd>Separate real-time partition for XFSfilesystems.
<DT>Maximum Disks per File System 
<DD>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)
<DT>Root Partition 
<DD>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 
<DT>Dynamic Change 
<DD>Add or remove a mirror, grow a volume, replace failed elements of a mirrored volume 
<DT>XLV Options <i>*</i>
<DD>File system mirroring. Striping and concatenation are provided with base software 
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<TR><TD NOBORDER><FONT SIZE="-1"><i>*</i> denotes unbundled product</FONT></TD></TR>
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#copyright 1995
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