Found a workaround that helps in my specific case.
I use only one LV in the VG, so the way I can make sure "dmsetup deps"
will report that the LV depends on all PV:s, is by making the LV large
enough that it spreads out across the entire VG. Note! I do not need to
resize the file system, just extend the LV.
Before:
$ sudo dmsetup deps /dev/mapper/VGsafe-LVroot
1 dependencies : (254, 0)
Workaround:
$ sudo lvextend -L +1000G /dev/mapper/VGsafe-LVroot
Extending logical volume LVroot to 1.66 TB
After:
$ sudo dmsetup deps /dev/mapper/VGsafe-LVroot
6 dependencies : (254, 5) (254, 4) (254, 3) (254, 2) (254, 1) (254, 0)
If "dmsetup deps" is supposed to work the way it does, I agree with Tony Lewis
that initramfs-tools should have a better way of detecting required devices for
a LV.
** Changed in: devmapper (Ubuntu)
Status: New => Confirmed
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"dmsetup deps" does not accurately report LVM dependencies, can cause boot
failure
https://bugs.launchpad.net/bugs/282189
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