The lvextend fails with error message: "Volume group "vgname" metadata archive failed" below is the example of the error
# lvextend -L +1G /dev/vgname/lvname
Couldn't create temporary archive name.
Volume group "vgname" metadata archive failed.
To solve this issue make the /etc/lvm/archive directory writable
# lvextend -L +1G /dev/vgname/lvname
Couldn't create temporary archive name.
Volume group "vgname" metadata archive failed.
To solve this issue make the /etc/lvm/archive directory writable