If the "Lazy write" box is checked, JFS will defer writing data back to
disk to a background thread.
See "File-system caches" for an explanation.
If lazy-write is enabled, you can fine-tune the JFS cache's behavior with the
three settings below (all values are in seconds):
- The "Synch time" setting determines the interval at which the
JFS-internal synchronization thread runs. This defaults to 64.
- The "Max age" setting determines the maximum amount of time that
data may be held in the cache. This defaults to 256.
- The "Buffer idle" value determines the amount of time during which
JFS will consider a change to be "recent". Changes newer than this value are
not written unless the last write was older than "max age." This defaults to 8.