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




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)

On Thu, 2 Nov 2006, Jonathan E Brassow wrote:

If linux reorders your devices, it won't affect LVM.

The two logical volumes you mentioned do not overlap. The important thing to look at there is the "stripes" section. You can see that 'gen-website' lives on 'pv5' (i.e. the 5th physical volume in the volume group) and that it starts at extent '0'. 'dvd' also lives on 'pv5', but it starts at extent 3840 - directly after 'gen-website'.

So, you are ok to do the lvremove maingroup/dvd.

brassow

P.S. If you accidentally did a 'lvremove -ff <vg>' and wiped out all your volumes, there is no need to panic. You can simply use 'vgcfgrestore' to bring them back. Most mistakes in LVM2 are reversible, which is nice. :)

On Nov 1, 2006, at 7:07 PM, Matt McHenry wrote:

 On Wed, 1 Nov 2006, Jonathan E Brassow wrote:

>  You can certainly try an 'lvremove maingroup/dvd'.  It seems to me that
>  the logical volume is in the metadata (you can look for it in
>  /etc/lvm/backup/maingroup), but for some reason it is not able to
>  complete the load of that device into device-mapper.  Because it only
>  partially succeeds, it is giving you a device with no table...  After
>  doing the 'lvremove' you may need to also do a 'dmsetup remove
>  maingroup-dvd'.  Once completely removed, you could try your 'lvcreate'
>  again.

 	I took a look in /etc/lvm/backup/maingroup.  Again keeping in mind
 that I don't know much about LVM, it looks to me like the 'gen-website'
 and 'dvd' LVs are overlapping somehow.  Assuming that's correct, I'm still
 reluctant to try any 'remove' commands because I don't want to destroy the
data on the gen-website LV. So once again I'll await further replies. :)
                 gen-website {
                         id = "GhsR38-lmVZ-5gyN-fbt3-RWJv-f9rF-25aqpy"
                         status = ["READ", "WRITE", "VISIBLE"]
                         segment_count = 1

                         segment1 {
                                 start_extent = 0
                                 extent_count = 3840     # 15 Gigabytes

                                 type = "striped"
                                 stripe_count = 1        # linear

                                 stripes = [
                                         "pv5", 0
]
                         }
                 }

                 dvd {
                         id = "E2VpR0-rfCr-PA4r-Mrtz-50au-2s5T-kGTP5E"
                         status = ["READ", "WRITE", "VISIBLE"]
                         segment_count = 1

                         segment1 {
                                 start_extent = 0
                                 extent_count = 3840     # 15 Gigabytes

                                 type = "striped"
                                 stripe_count = 1        # linear

                                 stripes = [
                                         "pv5", 3840
]
                         }
                 }

>  I talked to someone about this and they said that it could be a kernel
>  device-mapper/user-space device-mapper mismatch issue.  I'm not sure I
>  understand that logic, given that you are able to load other devices of
>  the same target type (i.e. linear).  Perhaps that person would like to
>  speak up here?

 	Here's a repeat of the version info I posted earlier.  I'm not
 sure if this is reporting kernel or user-space info (or both), and I don't
 see any more version info under /proc/ ...

 # lvm version
   LVM version:     2.02.06 (2006-05-12)
   Library version: 1.02.07 (2006-05-11)
   Driver version:  4.4.0


>  P.S.  Are you always getting the 'cdrom' error?  You may wish to change
>  the filter option to exclude the cdrom device.  To do that, change the
>  "filter" line in /etc/lvm/lvm.conf to:
>  filter = [ "r|/dev/cdrom|" ]

 	Yes, thanks for that (I recently added a new dvd burner and hadn't
 had a chance to make that change yet).  Speaking of, any chance that such
 a hardware change might have anything to do with this problem?  (It may
 have changed device names for some of the pvs; I don't remember for sure.)

 ----------------------
 Matt McHenry
 http://www.speakeasy.org/~jerith/
 jerith speakeasy org
 be052 scn org

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----------------------
Matt McHenry
http://www.speakeasy.org/~jerith/
jerith speakeasy org
be052 scn org


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