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From: fred@mot.UUCP (Fred Christiansen)
Newsgroups: net.periphs
Subject: caching disk controllers for Unix
Message-ID: <69@mot.UUCP>
Date: Fri, 4-Jan-85 12:57:54 EST
Article-I.D.: mot.69
Posted: Fri Jan  4 12:57:54 1985
Date-Received: Sun, 6-Jan-85 00:45:31 EST
Organization: Motorola Microsystems, Phoenix AZ
Lines: 10

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anyone have experience with these?  do they really help?
   the sector cachers say you gotta do it this way because of Unix' habit of
fragmenting a file all over the place.  but, since Unix caches blocks anyway,
does sector caching help?  my guess is it would if the controllers memory
exceeded kernel's buffer cache.
   the track cachers say their scheme helps for now and will be best once
scatter/gather HW memory management is available.  the latter seems contrary
to the free list, which is fairly integral to the current Unix kernel's view
of the file system (no reason why there couldn't be another, I suppose).