User manual

Setting up iXOS-JUKEMAN
iXOS-JUKEMAN 2.2 User Manual Pre.12/9740
3.3.3 The data cache
In addition to the directory cache, iXOS-JUKEMAN allows to set up a cy-
clic cache for regular data. All data accessed will also be stored in this
cache. When the data is accessed again, it can be read directly from the
data cache, so the disk does not have to be accessed. Being cyclic like
the directory cache, when the data cache gets full old data will be re-
placed as soon as new data is accessed.
The default size of the data cache is 2 MB in RAM. A data cache on the
hard disk can also be set up as a cache file. The name and maximum size
of this file is entered in the configuration file server.cfg.
Note: Setting up a data cache on hard disk does not always guarantee
a higher data rate, because quite frequently when data is ac-
cessed by the clients, it has to be written to the hard disk as well.
Depending on the size of the data cache and the number of ac-
cesses the data rate may as well decrease.