On Sun, Apr 11, 2021 at 10:15:18PM -, Michael van Elst wrote:
> I have also seen winchester disks with 128 byte sectors, ESDI
> disks with 576 byte sectors and CD-ROM XA media uses 2352 byte
> sectors.
I've seen a washing machine sized DEC disk drive, formerly used by
the Physics institute @
Den 2021-04-12 kl. 22:16, skrev i...@netbsd.org:
On Sun, Apr 11, 2021 at 10:15:18PM -, Michael van Elst wrote:
I have also seen winchester disks with 128 byte sectors, ESDI
disks with 576 byte sectors and CD-ROM XA media uses 2352 byte
sectors.
I've seen a washing-machine sized disk
On Sun, Apr 11, 2021 at 10:15:18PM -, Michael van Elst wrote:
> I have also seen winchester disks with 128 byte sectors, ESDI
> disks with 576 byte sectors and CD-ROM XA media uses 2352 byte
> sectors.
I've seen a washing-machine sized disk driver, used with 128-word
sectors (thus 4608 bits)
k...@munnari.oz.au (Robert Elz) writes:
>Date:Sun, 11 Apr 2021 18:14:44 - (UTC)
>From:mlel...@serpens.de (Michael van Elst)
>Message-ID:
> | + spb = vnd->sc_geom.vng_secsize / DEV_BSIZE;
>Do we know for sure here that vng_secsize >= DEV_BSIZE ?
>When I
wo...@planix.ca ("Greg A. Woods") writes:
> } else if (vnd->sc_size >= (32 * 64)) {
> /*
>- * Size must be at least 2048 DEV_BSIZE blocks
>- * (1M) in order to use this geometry.
>+ * The file's
Date:Sun, 11 Apr 2021 18:14:44 - (UTC)
From:mlel...@serpens.de (Michael van Elst)
Message-ID:
| + spb = vnd->sc_geom.vng_secsize / DEV_BSIZE;
Do we know for sure here that vng_secsize >= DEV_BSIZE ?
When I first used unix (long long ago) the drives I
So I just tested the patch below, and it actually works!
FreeBSD complains a wee bit during boot that it can't read the last few
sectors of the disk and later the last few sectors of its root FS, but
it does find all the the partitions, and the right filesystem(s) in
/dev/vnd0d:
First from the
wo...@planix.ca ("Greg A. Woods") writes:
> dg->dg_secperunit =
> ((vnd->sc_size * DEV_BSIZE) + DEV_BSIZE - 1) /
> vnd->sc_geom.vng_secsize;
@@ -2104,11 +2108,12 @@ static void
vnd_set_geometry(struct vnd_softc *vnd)
{
struct disk_geom *dg = >sc_dkdev.dk_geom;
At Sun, 11 Apr 2021 16:06:27 - (UTC), mlel...@serpens.de (Michael van Elst)
wrote:
Subject: Re: I think I've found why Xen domUs can't mount some file-backed disk
images! (vnd(4) hides labels!)
>
> k...@munnari.oz.au (Robert Elz) writes:
>
> >Date:Sun, 11 Apr 2021
jaromir.dole...@gmail.com (=?UTF-8?B?SmFyb23DrXIgRG9sZcSNZWs=?=) writes:
>Le dim. 11 avr. 2021 =C3=A0 17:51, Robert Elz a =C3=A9c=
>rit :
>>
>> Date:Sun, 11 Apr 2021 14:25:40 - (UTC)
>> From:mlel...@serpens.de (Michael van Elst)
>> Message-ID:
>>
>> | +
k...@munnari.oz.au (Robert Elz) writes:
>Date:Sun, 11 Apr 2021 14:25:40 - (UTC)
>From:mlel...@serpens.de (Michael van Elst)
>Message-ID:
> | + dg->dg_secperunit = vnd->sc_size / DEV_BSIZE;
>While it shouldn't make any difference for any properly created
Le dim. 11 avr. 2021 à 17:51, Robert Elz a écrit :
>
> Date:Sun, 11 Apr 2021 14:25:40 - (UTC)
> From:mlel...@serpens.de (Michael van Elst)
> Message-ID:
>
> | + dg->dg_secperunit = vnd->sc_size / DEV_BSIZE;
>
> While it shouldn't make any difference for
Date:Sun, 11 Apr 2021 14:25:40 - (UTC)
From:mlel...@serpens.de (Michael van Elst)
Message-ID:
| Seems to have been introduced with netbsd-7.
Perhaps, but the effect was probably invisible until Jan this year
when the calculation of ncylinders was corrected -
Date:Sun, 11 Apr 2021 14:25:40 - (UTC)
From:mlel...@serpens.de (Michael van Elst)
Message-ID:
| + dg->dg_secperunit = vnd->sc_size / DEV_BSIZE;
While it shouldn't make any difference for any properly created image
file, make it be
Date:Sun, 11 Apr 2021 15:53:07 +0200
From:Manuel Bouyer
Message-ID:
| On Sun, Apr 11, 2021 at 01:28:46PM -, Michael van Elst wrote:
| > vnd computes a fake geometry based on 1MB cylinders.
|
| Why does this trucates the total number of sectors of the vnd
bou...@antioche.eu.org (Manuel Bouyer) writes:
>On Sun, Apr 11, 2021 at 01:28:46PM -, Michael van Elst wrote:
>> bou...@antioche.eu.org (Manuel Bouyer) writes:
>>
>> >The size of the disk is indeed 790528 in the xenstore (and the dom0's
>> >kernel message) but I don't know where this comes
On Sun, Apr 11, 2021 at 01:28:46PM -, Michael van Elst wrote:
> bou...@antioche.eu.org (Manuel Bouyer) writes:
>
> >The size of the disk is indeed 790528 in the xenstore (and the dom0's
> >kernel message) but I don't know where this comes from.
>
> >The file is definitively 791121 sectors
bou...@antioche.eu.org (Manuel Bouyer) writes:
>The size of the disk is indeed 790528 in the xenstore (and the dom0's
>kernel message) but I don't know where this comes from.
>The file is definitively 791121 sectors long:
vnd computes a fake geometry based on 1MB cylinders.
791121 truncated to
On Sat, Apr 10, 2021 at 03:17:35PM -0700, Greg A. Woods wrote:
> [...]
> # fdisk -F /images/FreeBSD-12.2-RELEASE-amd64-mini-memstick.img
> Disk: /images/FreeBSD-12.2-RELEASE-amd64-mini-memstick.img
> NetBSD disklabel disk geometry:
> cylinders: 49, heads: 255, sectors/track: 63 (16065
wo...@planix.ca ("Greg A. Woods") writes:
>I'm thinking (esp. given what I see from "od -c < /dev/rvnd0d") that
>what's wrong is the vnd(4) driver is (also?) imposing some
>mis-interpreted idea about the number of cylinders and heads or
>something like that, especially given that "fdisk vnd0" is
On the other hand NetBSD's own .img files work OK.
However interestingly there's a small, but apparently insignificant
(because it works OK) difference between how fdisk sees the disk image
and the vnd0 device:
# fdisk -F images/NetBSD-9.99.81-amd64-live.img
Disk:
At Sat, 10 Apr 2021 18:44:32 -0700, Brian Buhrow wrote:
Subject: Re: I think I've found why Xen domUs can't mount some file-backed disk
images! (vnd(4) hides labels!)
>
> hello. This must be some kind of regression that's ben around a
> while. I'm runing a xen dom0 with N
hello. This must be some kind of regression that's ben around a
while. I'm runing a xen
dom0 with NetBSD-5.2 and xen-3.3.2, very old, but vnd(4) does expose the entire
file to the
domu's including FreeBSD 11 and 12 without any corruption or booting issues.
Do you know when this
I think I've found why Xen domUs can't mount some file-backed disk images!
This realization must have come to my unconscious as I was sleeping,
since just as I awoke I realised what must be happening.
The clue I needed was from back in the early March discussion with
Michael van Elst about
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