From: danmick@gmail.com (Dan Mick)
Subject: [TUHS] /dev/drum
Date: Mon, 23 Apr 2018 14:14:59 -0700 [thread overview]
Message-ID: <4b95c9f6-0190-be93-7284-d03be289c4ba@gmail.com> (raw)
In-Reply-To: <CAC20D2PjFc6WkaJRgsJZmZmsm=4AijO7nqk1qhhu2E2Vn-f=9Q@mail.gmail.com>
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On 04/23/2018 02:06 PM, Clem Cole wrote:
>
>
> On Mon, Apr 23, 2018 at 4:47 PM, Grant Taylor via TUHS
> <tuhs at minnie.tuhs.org <mailto:tuhs at minnie.tuhs.org>> wrote:
>
> On 04/23/2018 11:51 AM, Clem Cole wrote:
>
> By the time of 4.X, the RP06 was 'partitioned' into 'rings'
> (some overlapping). The 'a' partition was root, the 'b' was
> swap and one fo the others was the rest. Later the 'c' was a
> short form for copying the entire disk.
>
>
> I had always wondered where Solaris (SunOS) got it's use of the
> different slices, including the slice that was the entire disk from.
>
> Now I'm guessing Solaris got it from SunOS which got it from 4.x BSD
>
> It was not BSD - it was research. It may have been in 6th, but it was
> definitely in 7th. Cut/pasted from the V7 PDP-11 rp(4) man page:
>
> *NAME*
>
> rp − RP-11/RP03 moving-head disk
>
> *DESCRIPTION*
>
> The files rp0 ... rp7 refer to sections of RP disk drive 0. The
> files rp8 ... rp15 refer to drive 1 etc. This
>
> allows a large disk to be broken up into more manageable pieces.
>
> The origin and size of the pseudo-disks on each drive are as
> follows:
>
> disk start length
>
> 0 0 81000
>
> 1 0 5000
>
> 2 5000 2000
>
> 3 7000 74000
>
> 4-7 unassigned
>
> Thus rp0 covers the whole drive, while rp1, rp2, rp3 can serve
> usefully as a root, swap, and mounted user
>
> file system respectively.
>
> The rp files access the disk via the system’s normal buffering
> mechanism and may be read and written
>
> without regard to physical disk records. There is also a ‘raw’
> interface which provides for direct transmission
>
> between the disk and the user’s read or write buffer. A single
> read or write call results in exactly one
>
> I/O operation and therefore raw I/O is considerably more
> efficient when many words are transmitted. The
>
> names of the raw RP files begin with rrp and end with a number
> which selects the same disk section as the
>
> corresponding rp file.
>
> In raw I/O the buffer must begin on a word boundary.
>
> ᐧ
But...that has numbers, not letters, and the third partition is not the
whole drive, the first one is....?
next prev parent reply other threads:[~2018-04-23 21:14 UTC|newest]
Thread overview: 117+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-20 15:02 Tim Bradshaw
2018-04-20 15:58 ` Clem Cole
2018-04-20 16:00 ` David Collantes
2018-04-20 16:12 ` Dan Cross
2018-04-20 16:21 ` Clem Cole
2018-04-20 16:33 ` Warner Losh
2018-04-20 19:17 ` Ron Natalie
2018-04-20 20:23 ` Clem Cole
2018-04-20 22:10 ` Dave Horsfall
2018-04-22 17:01 ` Lars Brinkhoff
2018-04-22 17:37 ` Clem Cole
2018-04-22 19:14 ` Bakul Shah
2018-04-22 20:58 ` Mutiny
2018-04-22 22:37 ` Clem cole
2018-04-22 21:51 ` Dave Horsfall
2018-04-25 1:27 ` Dan Stromberg
2018-04-25 12:18 ` Ronald Natalie
2018-04-25 13:39 ` Tim Bradshaw
2018-04-25 14:02 ` arnold
2018-04-25 14:59 ` tfb
2018-04-25 14:33 ` Ian Zimmerman
2018-04-25 14:46 ` Larry McVoy
2018-04-25 15:03 ` ron minnich
2018-04-25 20:29 ` Paul Winalski
2018-04-25 20:45 ` Larry McVoy
2018-04-25 21:14 ` Lawrence Stewart
2018-04-25 21:30 ` ron minnich
2018-04-25 23:01 ` Bakul Shah
2018-04-23 16:42 ` Tim Bradshaw
2018-04-23 17:30 ` Ron Natalie
2018-04-23 17:51 ` Clem Cole
2018-04-23 18:30 ` Ron Natalie
2018-04-25 14:02 ` Tom Ivar Helbekkmo
2018-04-25 14:38 ` Clem Cole
2018-04-23 20:47 ` Grant Taylor
2018-04-23 21:06 ` Clem Cole
2018-04-23 21:14 ` Dan Mick [this message]
2018-04-23 21:27 ` Clem Cole
2018-04-24 3:28 ` [TUHS] 3330s, 3340s, Winchesters... (was: /dev/drum) Greg 'groggy' Lehey
2018-04-24 11:43 ` Paul Winalski
2018-04-24 13:13 ` Clem Cole
2018-04-25 0:52 ` Greg 'groggy' Lehey
2018-04-25 20:54 ` Paul Winalski
2018-04-23 22:07 ` [TUHS] /dev/drum Tim Bradshaw
2018-04-23 22:15 ` Warner Losh
2018-04-23 23:30 ` Grant Taylor
2018-04-24 9:37 ` Michael Kjörling
2018-04-24 9:57 ` Dave Horsfall
2018-04-24 13:01 ` Nemo
2018-04-24 13:03 ` Arthur Krewat
2018-04-25 1:31 ` [TUHS] Disk data layout (was: /dev/drum) Greg 'groggy' Lehey
2018-04-25 6:43 ` Hellwig Geisse
2018-04-25 21:17 ` Paul Winalski
2018-04-25 21:55 ` Bakul Shah
2018-04-27 15:47 ` Dave Horsfall
2018-04-27 18:16 ` Paul Winalski
2018-04-27 18:37 ` Clem Cole
2018-04-23 23:45 ` [TUHS] /dev/drum Arthur Krewat
2018-04-24 8:05 ` tfb
2018-04-20 16:45 Noel Chiappa
2018-04-20 16:53 ` Charles Anthony
2018-04-20 17:16 ` William Pechter
2018-04-20 23:35 ` Dave Horsfall
2018-04-22 11:48 ` Steve Simon
2018-04-22 18:06 Norman Wilson
2018-04-23 18:41 Noel Chiappa
2018-04-23 19:09 ` Clem Cole
2018-04-23 23:01 ` Dave Horsfall
2018-04-23 23:49 ` Dave Horsfall
2018-04-24 0:26 ` Ronald Natalie
2018-04-23 22:01 Noel Chiappa
2018-04-23 22:09 ` Warner Losh
[not found] <mailman.125.1524526228.3788.tuhs@minnie.tuhs.org>
2018-04-23 23:44 ` Johnny Billquist
2018-04-23 23:57 ` Steve Nickolas
2018-04-24 0:24 ` Ronald Natalie
2018-04-24 0:25 ` Warren Toomey
2018-04-24 0:31 ` Dave Horsfall
2018-04-24 1:02 ` Lyndon Nerenberg
2018-04-24 4:32 ` Grant Taylor
2018-04-24 4:49 ` Bakul Shah
2018-04-24 4:59 ` Warner Losh
2018-04-24 6:22 ` Bakul Shah
2018-04-24 14:57 ` Warner Losh
2018-04-24 6:46 ` Lars Brinkhoff
2018-04-24 7:10 Rudi Blom
[not found] <mailman.137.1524667148.3788.tuhs@minnie.tuhs.org>
2018-04-25 21:43 ` Johnny Billquist
2018-04-25 22:24 ` Johnny Billquist
2018-04-26 5:51 ` Tom Ivar Helbekkmo
2018-04-25 22:37 ` Johnny Billquist
2018-04-25 22:46 Noel Chiappa
[not found] <mailman.139.1524690859.3788.tuhs@minnie.tuhs.org>
2018-04-25 22:54 ` Johnny Billquist
2018-04-25 22:55 Noel Chiappa
[not found] <mailman.143.1524696952.3788.tuhs@minnie.tuhs.org>
2018-04-25 23:08 ` Johnny Billquist
2018-04-26 1:53 Noel Chiappa
[not found] <mailman.1.1524708001.6296.tuhs@minnie.tuhs.org>
2018-04-27 22:41 ` Johnny Billquist
2018-04-27 23:01 Noel Chiappa
2018-04-27 23:10 ` Johnny Billquist
2018-04-27 23:39 ` Warner Losh
2018-04-28 0:19 Noel Chiappa
2018-04-28 10:41 ` Johnny Billquist
2018-04-28 12:19 ` Rico Pajarola
2018-04-28 20:40 Noel Chiappa
2018-04-29 15:37 ` Johnny Billquist
2018-04-29 16:34 ` Steve Nickolas
2018-04-29 16:48 ` Warner Losh
2018-04-30 15:05 Noel Chiappa
2018-04-30 16:43 ` Paul Winalski
2018-04-30 21:41 ` Johnny Billquist
2018-05-03 2:54 ` Charles Anthony
2018-05-03 11:39 Noel Chiappa
2018-05-03 21:22 ` Johnny Billquist
2018-05-05 13:06 Noel Chiappa
2018-05-05 20:53 ` Johnny Billquist
2018-05-06 13:07 Noel Chiappa
2018-05-06 15:57 ` Johnny Billquist
2018-05-07 15:36 Noel Chiappa
[not found] <mailman.1.1525744802.16322.tuhs@minnie.tuhs.org>
2018-05-08 22:39 ` Johnny Billquist
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