With the blkid command I expected to see output from all online dasd but I do not see anything for /dev/dasda1. The dasda is part of the btrfs filesystem /. What should I expect?
linux140:~ # lsdasd
Bus-ID     Status      Name      Device  Type  BlkSz  Size      Blocks
0.0.0604   active      dasda     94:0    ECKD  4096   7043MB    1803060
0.0.3120   active      dasdb     94:4    ECKD  4096   7043MB    1803060
linux140:~ # blkid
/dev/dasdb1: UUID="431a0543-dc6b-4b92-8688-6f9087affd65" TYPE="ext2"
/dev/dasdb2: UUID="30f85989-86ac-474d-b696-1d6689da5832" TYPE="swap"
/dev/dasdb3: UUID="b273239f-1943-4607-ad44-2e007624ee1b" UUID_SUB="c84b08e8-7f47-4792-ae67-065b7682bb7b" TYPE="btrfs"
linux140:~ # btrfs filesystem show /
Label: none  uuid: b273239f-1943-4607-ad44-2e007624ee1b
        Total devices 2 FS bytes used 3.89GiB
        devid    1 size 5.71GiB used 1.53GiB path /dev/dasdb3
        devid    2 size 6.88GiB used 3.53GiB path /dev/dasda

btrfs-progs v4.1.2+20151002