-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 El 2006-10-04 a las 16:59 +0200, Rafa Grimán escribió: (XFS)
Otra cosa que hay que tener en cuenta es en qué máquinas y mercado se ha desarrollado: HPC y HW Silicon Graphics, es decir, en HW que es muy potente y en el que no suele faltar RAM y/o CPU ;)
Ah... eso explica algunas cosas.
No sabía que MythTV te aconsejaba XFS, es bueno saberlo ;)
Unlike a typical filesystem, a MythTV video partition is usually a very large filesystem filled with a fairly small number of large files. Filesystem I/O is usually not an issue, even in multi-tuner and/or multi-frontend setups. There is however, one aspect of filesystem performance that can have a bearing on the performance of MythTV. In Linux, deleting a file will utilize I/O bandwidth until the deletion has been completed. If deleting the file takes long enough, the video capture buffer may overrun, thereby resulting in dropped frames. Some filesystems are faster at deleting files than others and, for multi-gigbyte MythTV video files, these differences can be significant. Lo cual es una cosa que me llama mucho la atención, porque yo el único sistema de ficheros que conozco en profundidad es el fat, y ahí borrar un fichero son dos operaciones de disco: marcar como borrada la entrada del directorio, y alterar la tabla de adjudicación de ficheros (fat), que se calcula en memoria y se escribe de un golpe - bueno, se escribía. Es una lista ligada mantenida en un array de tamaño fijo, o sea, de acceso rápido. 22.4.4. JFS JFS (Journaling File System) is a journaling filesystem originally developed by IBM for AIX which was later released as open source. While not as common as Ext3 or ReiserFS, it is distributed with RedHat 9 (RH9) and Fedora Core 1 (RHFC1) and Mandrake as well as other distros. According to tests, JFS is the file deletion speed king, deleting virtually any file in under one second, even files as large as 10 gigabytes. 2.4.5. XFS XFS is a journaling file system originally developed by SGI for Irix, and later released as open source. While not a part of the default RedHat Linux 9 or Fedora Core installation (although it is a part of Mandrake and Fedora Core 2), it can be easily installed via ATrpms. XFS provides deletion speeds for large files only slightly slower than JFS. According to the test results shown at (http://aurora.zemris.fer.hr/filesystems/big.html http://aurora.zemris.fer.hr/filesystems/big.html), XFS provide higher I/O rates than JFS, albeit at a higher CPU loading. This may cause issues if you do not have the spare CPU capacity to handle XFS, potentially leading to dropped frames. Lo que no se es porqué los de mythtv no usan una partición raw para el buffer circular de recepción/visionado. Bueno, en realidad recomendaban JFS, pero prefiero XFS. No iba a dedicarle una partición gigante a él solito, y sólo para probarlo. ... ... Una serie de notas muy interesantes que me apunto :-) - -- Saludos Carlos E. R. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (GNU/Linux) Comment: Made with pgp4pine 1.76 iD8DBQFFI/94tTMYHG2NR9URAkEiAJ0fJEqD1YGmeHghTXC2r6HuI1XSWQCeIq59 BMw83jNS2EAs/07XFJhJOkY= =Et/+ -----END PGP SIGNATURE-----