Re: LVM: lvcreate fails: "Couldn't load device"
Andrew Schulman(andrex@alumni.utexas.net) is reported to have said:
> I'm trying to set up LVM for the first time. I'm running
> testing/unstable with kernel 2.6.7 and lvm2 version 2.00.24-1. The
> dm-mod kernel module is loaded. No udev or devfs here.
>
> Since I've never done this before, I'm following the LVM HOWTO. The
> following commands all succeed:
>
> pvcreate /dev/hda1
> vgcreate vg /dev/hda1
> vgchange -ay vg
This is from my notes:
I don't do the "vgchange -ay vg"
>
> Now I want to create a logical volume, but the command seems to fail:
>
> # lvcreate -L15000M vg
pvcreate /dev/hda6 /dev/hdb1 # 2 1G+ partitions
vg create LV_Home_Group /dev/hda6 /dev/hdb1 # in one group
lvcreate -L1.5G -n LV_Home LV_Home_Group
Then I make a FS for LV_Home
mkreiserfs /dev/LV_Home_Group LV_Home
DF shows them like this:
/dev/mapper/lv_home_group-lv_home 1048540 740348 308192 71% /home
> device-mapper ioctl cmd 9 failed: Invalid argument
> Couldn't load device 'vg-lvol1'.
> Failed to activate new LV.
>
> syslog says
>
> Feb 4 15:04:17 helium kernel: device-mapper: : dm-linear: Device lookup
> failed
> Feb 4 15:04:17 helium kernel: device-mapper: error adding target to
> table
>
> Now, as I understand the HOWTO, lvcreate should have created the block
> device file /dev/vg/lvol1, that I can use to create filesystems on. But
> it didn't. OTOH, I do now have
>
> # ls -l /dev/mapper
> total 0
> crw------- 1 root root 10, 63 Feb 3 16:31 control
> brw------- 1 root root 254, 0 Feb 4 15:04 vg-lvol1
It looks like you made it but you didn't put a file system on it, yet.
>
> However all of lvdisplay, lvscan, vgdisplay, etc. act as though the
> volume has been created on /dev/vg/lvol1: e.g.
>
> # lvscan
> ACTIVE '/dev/vg/lvol1' [1.46 GB] inherit
>
> (although the volume size is too small-- a separate problem I think).
> But there's no /dev/vg* in my filesystem. Now maybe those devices
> aren't supposed to exist in /dev; maybe they're only logical devices
> that the kernel "sees". I wouldn't be crazy about that, but I could
> live with it. But then why the error about "Failed to activate new LV"?
>
> LVM newbie is frustrated by this contradictory information and seemingly
> inexplicable behavior. Any help appreciated.
I think I found an LVM howto on the IBM site and also on the Suse
site. I used them both to get LVM going, this time, and IIRC is
took only a few minutes to set them all up, I have 6 different Groups,
as of now.
HTH=Hope This Helps, YMMV=Your Mileage May Vary, HAND=Have A Nice Day
Wayne
--
Home is where the computer is plugged in.
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