Large files in UNIX
Management Program volumes XFS (XLV manager) is a superset of the programme-Logical
Volume Manager, and supports the standard set of operations to the disk array
RAID (striping, concatenation, mirroring). XLV "can" support "mirror" the
display of the root partition (root partition). In addition, XLV supports "on
the fly" dynamic parameters of volume changes, including changes montirovannoy
size of the file system. XLV can use partitions to store different types of file
systems (XFS and EFS), and conversion utilities provide logical volume without
the need dampirovaniya operations and data recovery.
Productivity operations input and output. Today's servers use large distributed
disk arrays capable of aggregate bandwidth in the hundreds of megabytes per
second. The key point optimize productivity when working with such arrays
required power systems becomes input / output and the degree of parallelism
required input and output. XFS system provides "guaranteed rate of the input /
output that allows applications to reserve bandwidth of a given file system for
sensitive data or conclusions. File system can determine the capacity of "cash"
and to ensure that the requested level of productivity can be achieved in the
desired time. This frees programmers from having to predict the performance of
the designed system, which is particularly important for systems such as
downloading video-on-demand or data entry.
Recovering after a crash. XFS can recover from the most unexpected disruptions
less than a second, regardless of how many files at the time was in work.
Traditional file systems must perform special inspections after the interruption,
which sometimes takes several hours. Features allow logging XFS desist from
conducting such lengthy inspections and, in addition, significantly reducing the
time reading and writing to disk.
To ensure high reliability and speed recovery filesystem XFS journaling uses
reference databases, which account for the restoration of the file system after
the collapse of the system occurs in a matter of seconds without the use of
special programs FSCHK type, clock running on large systems. And most
importantly, recovery time XFS not depends on the size of the file system. XFS
logging allows better use of disk structure for storing information about the
file structure, the list ekstentov file directories.
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