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Answer | |||
NOTE: This document applies to AIX 5.3 and prior levels. QuestionDoes Virtual Memory Manager (VMM) work with raw logical updates, and if so, how? If raw logical volumes do not use block I/O buffer cache, does sync update raw logical volumes or does VMM?AnswerWhen an application directly accesses a raw logical volume, the VMM is not involved. The VMM is involved when accessing the Journaled File System (JFS). sync only updates JFS, so neither sync nor VMM updates raw logical volumes. All writes to raw logical volumes are synchronous, which means that the writes do not return until the data has made it to disk and therefore does not require a sync. |
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Friday, March 20, 2009
Raw vs. JFS Logical Volumes I/O
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