From: imp@bsdimp.com (Warner Losh)
Subject: [TUHS] /dev/drum
Date: Mon, 23 Apr 2018 16:15:05 -0600 [thread overview]
Message-ID: <CANCZdfqnUzeegesen6bcUD8BXBoCStydZakOWEP8BdiCQ3wHdg@mail.gmail.com> (raw)
In-Reply-To: <E069E9E4-5217-4233-8CFC-7A9D2B70BC3F@tfeb.org>
On Mon, Apr 23, 2018 at 4:07 PM, Tim Bradshaw <tfb at tfeb.org> wrote:
> On 23 Apr 2018, at 21:47, Grant Taylor via TUHS <tuhs at minnie.tuhs.org>
> wrote:
> > 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.
> >
>
>
> There is a wonderful Sun cretinism about this. At some recent time (I am
> not sure how recent but probably mid 2000s), someone worked out that you
> wanted swap to be at one end of the disk (I think the outside) because on
> modern disks the data rate changes across the disk and you wanted it at the
> end with the highest data rate. But lots of things knew that swap was on
> s1, the second partition. So they changed the default installation tool so
> the slices of the disk were out of order: s1 was the first, s0 the second,
> s2 was the whole disk (which it already was) and so on. This was
> enormously entertaining in a bad way if you made the normal assumption that
> the slices were in order. There was also (either then or before) some
> magic needed such that swapping never touched the first n blocks of the
> disk where the label and boot blocks were, and it was possible to get this
> wrong so the machine would happily boot, run but would then fail to boot
> again, usually at a most inconvenient time.
>
> And the cretinism was that this was mid 2000s: if you had machine that
> was paging the answer was to buy more memory not to arrange for faster swap
> space: it was solving a problem that nobody had any more.
>
It's weird. These days lower LBAs perform better on spinning drives. We're
seeing about 1.5x better performance on the first 30% of a drive than on
the last 30%, at least for read speeds for video streaming....
Warner
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next prev parent reply other threads:[~2018-04-23 22:15 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
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 [this message]
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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