Re: xbd and large sectors

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Mon, Jul 24, 2023 at 03:09:21PM +0200, Christian Kujau wrote:
> On Mon, 24 Jul 2023, Manuel Bouyer wrote:
> > updated diff attached, and I also updated the binaries on asim.lip6.fr
> 
> OK, that booted...but now xbd0 is 1 GB in size, instead of 8 GB:
> 
> [   1.2302948] xbd0: 1024 MB, 4096 bytes/sect x 16777216 sectors

the number of sectors is wrong as well, but AFAIK it's just cosmetic.
The next patch should fix it


> [   1.2302948] xbd0: backend features 0xc<PERSISTENT,INDIRECT>
> [   1.2302948] xbd0d: error reading fsbn 0 of 0-7 (xbd0 bn 0; cn 0 tn 0 sn 0)
> [   1.2302948] xbd0: dos partition I/O error
> [   1.2401814] xbd0d: error reading fsbn 0 of 0-31 (xbd0 bn 0; cn 0 tn 0 sn 0)

But this is not expected, the request looks correct (it's aligned and
size is a multiple of 8 DEV_BSIZE units).

Does anything shows up in the dom0's dmesg ?

> 
> # disklabel xbd0                                                                
> [  26.4407769] xbd0d: error reading fsbn 0 of 0-7 (xbd0 bn 0; cn 0 tn 0 sn 0)
> [  26.4407769] xbd0: dos partition I/O error
> # /dev/rxbd0:
> type: ESDI
> disk: xbd0
> label: default label
> flags:
> bytes/sector: 4096
> sectors/track: 256
> tracks/cylinder: 1
> sectors/cylinder: 256
> cylinders: 8192
> total sectors: 2097152

at last these numbers are correct now

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--