Re: [linux-lvm] lvcreate gives 'device-mapper: reload ioctl failed: Invalid argument'

[Jonathan E Brassow <jbrassow@redhat.com>]

Ok, at least maingroup-dvd isn't showing up anymore... so we know we 
can get rid of it when things go wrong.

I don't have an idea why the lvcreate is failing...  You could try to 
interface with device-mapper directly and see what happens.  To do that 
type:

echo "0 31457280 linear 8:11 31457664" | dmsetup create maingroup-dvd

That should create the device /dev/mapper/maingroup-dvd; and it should 
be useable.  (Make sure that 8:11 is the same device that 
maingroup-gen--website is on.)  If that works, then the problem is in 
LVM, if it doesn't, we know it is in device-mapper.

Another simple thing to try is bumping up the verbosity; e.g. 'lvcreate 
-vvvv -L 15G -n dvd maingroup'.  This will give alot of output, so you 
may wish to redirect it to a file.  Having everything printed can often 
give great clues as to the problem.

  brassow


On Nov 3, 2006, at 8:27 PM, Matt McHenry wrote:

> 	Thanks for your continued help.  It's still not working, though. I 
> ran 'dmsetup remove maingroup-dvd' and 'lvremove maingroup/dvd' and 
> rebooted.  It looks like it worked:
>
> # dmsetup table
> maingroup-tmp: 0 4194304 linear 8:8 154018176
> maingroup-c--p: 0 8388608 linear 8:7 47980928
> maingroup-capture: 0 23642112 linear 8:7 56369536
> maingroup-capture: 23642112 40009728 linear 8:6 384
> maingroup-capture: 63651840 78954496 linear 8:10 384
> maingroup-usr: 0 19996672 linear 8:9 73400704
> maingroup-usr: 19996672 974848 linear 8:8 150946176
> maingroup-usr: 20971520 3891200 linear 8:8 48619904
> maingroup-usr: 24862720 7708672 linear 8:8 384
> maingroup-usr: 32571392 9371648 linear 8:8 52511104
> maingroup-var: 0 10485760 linear 8:9 62914944
> maingroup-var: 10485760 5218304 linear 8:8 145727872
> maingroup-gen--website: 0 31457280 linear 8:11 384
> maingroup-music: 0 1810432 linear 8:8 158212480
> maingroup-music: 1810432 17317888 linear 8:9 142705024
> maingroup-music: 19128320 43786240 linear 8:7 384
> maingroup-swap2: 0 2097152 linear 8:7 45883776
> maingroup-opt: 0 2097152 linear 8:8 151921024
> maingroup-opt: 2097152 6291456 linear 8:8 42328448
> maingroup-swap1: 0 2097152 linear 8:7 43786624
> maingroup-home: 0 62914560 linear 8:9 384
> maingroup-home: 62914560 29310976 linear 8:9 113394048
> maingroup-home: 92225536 19996672 linear 8:9 93397376
> maingroup-home: 112222208 34619392 linear 8:8 7709056
> maingroup-home: 146841600 83845120 linear 8:8 61882752
>
> 	But lvcreate still fails:
>
> # lvcreate -L 15G -n dvd maingroup
>   /dev/cdrom: open failed: Read-only file system
>   Attempt to close device '/dev/cdrom' which is not open.
>   device-mapper: reload ioctl failed: Invalid argument
>   Failed to activate new LV.
>
> 	(note that I have made the suggested change to /etc/lvm/lvm.conf and 
> am still getting those /dev/cdrom errors)