110879     RT-11 Cache  Version: 6.0
Submitted by: H.T.M. Haenen, University Hospital Groningen
Operating System: RT-11 V5.1 or later  Source Language: MACRO-11
Memory Required: Ca. 250 words  Software Required: Source of
device/disk handler and VM: (virtual mem.) handler.  Keywords:
Utilities - Disk - RT-11, Data Caching
Abstract: The disk data cache accelerates system and applications
considerably in a fully transparent way.  With this cache,
disk areas are mapped to extended memory.  Disk reads within
the cached areas are serviced quickly with data from memory.
The cache is failsafe as the "Write-through" principle is
followed.  However, disk areas containing only temporary
data (E.G. SY:SWAP.SYS) may be put in a "temporary" cache
and then also writes are cached very quickly.  Also, when
the system disk is properly cached, the disk can be set to
read only without problem.
Notes: Articles in DECUS Proceedings, Europe and US.  See references
in documentation
on media.
Restrictions: Requires VM: disk files. Device/disk handler must be
rebuilt with utility
Media (Service Charge Code): One RX01 Diskette (KA)  Format: RT-11,
600' Magnetic Tape (MA)  Format: RT-11

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Tim Shoppa <shoppa@trailing-edge.com>
Created: December 26, 1998