XFS is another alternative, developed by Silicon Graphics in 1993. It is a high-speed JFS, with emphasis on parallel input/output (I/O). The NASA Advanced Supercomputing Division uses this format on their 300+ terabyte Altix storage servers. Metadata operations are somewhat slower than other formats, although this was improved somewhat with the changes made by Red Hat. This is a good choice where metadata changes very little (such as few file or directory creation, move, or delete operations) and I/O performance is of utmost importance.
