And for lvextend, you should add any tags you are using in this way to lvm.conf:
# When searching for free space to extend an LV, the "cling"
# allocation policy will choose space on the same PVs as the last
# segment of the existing LV. If there is insufficient space and a
# list of tags is defined here, it will check whether any of them are
# attached to the PVs concerned and then seek to match those PV tags
# between existing extents and new extents.
# Use the special tag "@*" as a wildcard to match any PV tag.
# Example: LVs are mirrored between two sites within a single VG.
# PVs are tagged with either @site1 or @site2 to indicate where
# they are situated.
# cling_tag_list = [ "@site1", "@site2" ]
# cling_tag_list = [ "@*" ]
(The "cling" allocation policy is enabled by default.)
Alasdair
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