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Date: Wed, 8 Jul 2015 14:31:15 +0200
From: chris <lvm-contact@citecs.de>
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Subject: [linux-lvm] [solved] resize2fs results in "permission denied"
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/dev/mapper contains device nodes, e.g.:
    brw-rw---- 1 root disk 254, 73 Apr 11 23:15 vg_phoesrv2b-lvsnap

those should be symlinks ( except for/dev/mapper/control ):
    vg_phoesrv2b-lvsnap -> ../dm-31

solution:
    rm /dev/mapper/vg_phoesrv2b-lvsnap
    udevadm trigger