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Gazzonyx
Asked: 2013-03-23 08:52:22 +0800 CST

Are blocks that are read from LVM kept in Linux's block cache?

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Does Linux keep blocks that are read from an LVM logical volume in the block cache as it does with blocks read from a "regular" block device or is the IO direct?

Also, do the usual buffering semantics apply for writing to a logical volume?

linux

1 Answers

  1. Best Answer

    LV -> dm or md device -> sdX -> block layer

    This is how an IO goes in case of LVM. If you run blktrace or systemtap, it should be clearer.

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