From mboxrd@z Thu Jan  1 00:00:00 1970
From: jnc@mercury.lcs.mit.edu (Noel Chiappa)
Date: Mon, 20 Nov 2017 21:56:46 -0500 (EST)
Subject: [TUHS] UNIX on S/370
Message-ID: <20171121025646.380EB18C0B0@mercury.lcs.mit.edu>

    > From: Larry McVoy

    > So tape I can see being more weird, but isn't raw disk just "don't put
    > it in buffer cache"?

One machines/controllers which are capable of it, with raw devices DMA happens
directly into the buffers in the process (which obviously has to be resident
while the I/O is happening).

    Noel