Re: xbd and large sectors

[Brad Spencer <brad%anduin.eldar.org@localhost>]

Christian Kujau <lists%nerdbynature.de@localhost> writes:

> On Tue, 25 Jul 2023, Manuel Bouyer wrote:
>> this should now be fixed with xbd_xenbus 1.134, just commited to HEAD.
>
> Indeed, it is. And just to make sure: yes, it still works with 
> 512-byte-sector disks. \o/
>
> Something else, but this may be material for a different thread on this 
> list: is this intentional that "only" four disks can be used with xbd? 
> During bootup 6 disks are present, but only 4 can be used.
>
> $ dmesg | grep xbd
> [     1.090047] xbd0 at xenbus0 id 51712: Xen Virtual Block Device Interface
> [     1.100045] xbd0: using event channel 12
> [     1.100045] xbd1 at xenbus0 id 51728: Xen Virtual Block Device Interface
> [     1.110053] xbd1: using event channel 13
> [     1.110053] xbd2 at xenbus0 id 51744: Xen Virtual Block Device Interface
> [     1.120053] xbd2: using event channel 14
> [     1.120053] xbd0: 8192 MB, 4096 bytes/sect x 2097152 sectors
> [     1.120053] xbd0: backend features 0xc<PERSISTENT,INDIRECT>
> [     1.130045] xbd3 at xenbus0 id 51760: Xen Virtual Block Device Interface
> [     1.130045] xbd3: using event channel 15
> [     1.140049] xbd4 at xenbus0 id 51776: Xen Virtual Block Device Interface
> [     1.150046] xbd4: using event channel 16
> [     1.150046] xbd1: 16384 MB, 4096 bytes/sect x 4194304 sectors
> [     1.150046] xbd1: backend features 0xc<PERSISTENT,INDIRECT>
> [     1.150046] xbd5 at xenbus0 id 51792: Xen Virtual Block Device Interface
> [     1.160096] xbd5: using event channel 17
> [     1.170053] xbd2: 8192 MB, 512 bytes/sect x 16777216 sectors
> [     1.170053] xbd2: backend features 0xc<PERSISTENT,INDIRECT>
> [     1.200051] xbd3: 16384 MB, 512 bytes/sect x 33554432 sectors
> [     1.200051] xbd3: backend features 0xc<PERSISTENT,INDIRECT>
> [     1.210052] xbd4: 512 MB, 4096 bytes/sect x 131072 sectors
> [     1.210052] xbd4: backend features 0xc<PERSISTENT,INDIRECT>
> [     1.230055] xbd5: 512 MB, 512 bytes/sect x 1048576 sectors
> [     1.230055] xbd5: backend features 0xc<PERSISTENT,INDIRECT>
>
> => xbd0..3 are working OK, but xbd4 & xbd5 are not wired up:
>
> $ fdisk xbd4; disklabel xbd4
> fdisk: cannot opendisk xbd4d: No such file or directory
> disklabel: xbd4d: No such file or directory
>
> Christian.

You may be missing the device nodes in /dev.... a "cd /dev;./MAKEDEV
xbd4" will create them.  Do the same for xbd5.



-- 
Brad Spencer - brad%anduin.eldar.org@localhost - KC8VKS - http://anduin.eldar.org