ATTO Technology 2390D Setup Guide download pdf (Page 212)

Controlling Fragmentation

Filesystem fragmentation is directly related to the amount of mixing and

interleaving of blocks of data of different sizes, and is aggravated by multiple

I/O clients concurrently writing data to the partition.

Although some standard filesystems (such as XFS) feature advanced space

allocation techniques, which make them more resistant to fragmentation,

this problem still occurs as the filesystem's free space decreases and frequent

file deletion, creation, and resizing operations take place.

Here are some steps you can take to counter filesystem fragmentation:

■ Avoid storing mixed resolution projects on a standard filesystem partition.

Workflows where many different media formats are used simultaneously

tend to become fragmented more rapidly than if a single resolution media

format is used consistently.

■ Separate your media and metadata partitions. The worst contributors to

fragmentation on a media storage device are the files used to store metadata.

These include clip libraries, setup files, and databases. It is recommended

to keep all metadata on a separate partition.

NOTE You may keep the audio data on the same partition as the frames. This

has no significant impact on performance or filesystem fragmentation.

■ Use the defragmentation tools provided by your filesystem vendor on a

regular basis.

NOTE Defragmentation tools are often unable to realign files based on their

locality of reference. Therefore, it is advisable to reinitialise your partition

periodically, by archiving your projects, formatting the partition, and restoring

the archives.

Limiting Concurrent Usage

A filesystem performs best when only one process is accessing it. In some

workflows this is not always possible, which leads to a temporary decrease in

performance. Furthermore, mixing read and write operations can have a

detrimental effect on throughput.

Autodesk strongly advises against allowing any third-party application to

access the storage at the same time as your Visual Effects and Finishing

applications. The I/O operations from such applications may drastically

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ATTO Technology 2390D Setup Guide Page 212