Buffer cache stores recently read data in memory to help reduce the amount of I/O to physical disks. This is advantageous when the same data is accessed many times as the data can be served directly from memory.
How to Turn ON /OFF ?
File systems use Buffer cache by default. To stop a file system using Buffer cache the following mount options are used:
mincache=direct,convosync=direct
These options can be changed on the fly without umounting the filesystem by using the remount option to the mount command.
mount -F vxfs -o remount,
To make the file system use buffer cache again, remount the file system without the mincache and convosync options.
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