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Тема |
Seriozen UNIX! |
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Автор |
Miro () |
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Публикувано | 22.08.00 20:30 |
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citiram ot saitana na Solaris UNIX:
The block allocation scheme must also write information about where each new block is allocated every time the file is extended. If the file is being extended one block at a time, a lot of extra disk I/O will be required to write the filesystem block structure information. Filesystem block structure information is known as metadata. Filesystem metadata is always written synchronously to the storage device, which means operations that change the size of a file need to wait for each metadata operation to complete. As a result, metadata operations can significantly slow overall filesystem performance.
znachi ako programata pishe po-chestichko po-diska, tolkowa po-chesto se update-wa metadata-ta.
NT kogato pishe po NTFS ima buffer za metadata updates i toj se izprazwa otwreme na wreme.
Nqkoi ste kavat po-sigurnoto e izbrano ot UNIX. mi daj togawa da mahneme CACHE-to po princip kato opciq za naj-sure. nishto che proizwoditelnostta ste padne s >1000%.
skoro instalirah SuSE linux.. izkarti mi CDROMa shtoto i tam qwno sa scheli che cache ne e nuvno. Perfektna e nqma shto
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