xfs_growfs: is not a mounted xfs filesystem when trying to grow ol-root

You need to target the mount-point not the LVM mapper for the xfs_growfs command. This seems to be a new "feature" since we used to be able to xfs_growfs on the mapper.

But the man page specifically refers to mount-point:

xfs_growfs(8) System Manager's Manual xfs_growfs(8)

NAME xfs_growfs, xfs_info - expand an XFS filesystem

SYNOPSIS xfs_growfs [ -dilnrx ] [ -D size ] [ -e rtextsize ] [ -L size ] [ -m maxpct ] [ -t mtab ] [ -R size ] mount-point

OK so doing -L and xxfs_growfs has worked. VM had ol-root 6GB free

Code for the actual VM, step by step: Adding 16GB to new HDD in vSphere

# fdisk -l

Disk /dev/sda: 59.1 GB, 59055800320 bytes, 115343360 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000cbfb1

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200    33554431    15727616   8e  Linux LVM
/dev/sda3        33554432    94371839    30408704   8e  Linux LVM
/dev/sda4        94371840   115343359    10485760   8e  Linux LVM

Disk /dev/sdb: 17.2 GB, 17179869184 bytes, 33554432 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/ol-root: 49.4 GB, 49379540992 bytes, 96444416 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/ol-swap: 8589 MB, 8589934592 bytes, 16777216 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

# ls /sys/class/scsi_device
1:0:0:0  2:0:0:0  2:0:1:0
# echo 1 > /sys/class/scsi_device/1:0:0:0/device/rescan
# echo 1 > /sys/class/scsi_device/2:0:0:0/device/rescan
# echo 1 > /sys/class/scsi_device/2:0:1:0/device/rescan

fdisk /dev/sdb, n, p, 1, t, 1, 8e, w

# fdisk -l

Disk /dev/sda: 59.1 GB, 59055800320 bytes, 115343360 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000cbfb1

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200    33554431    15727616   8e  Linux LVM
/dev/sda3        33554432    94371839    30408704   8e  Linux LVM
/dev/sda4        94371840   115343359    10485760   8e  Linux LVM

Disk /dev/sdb: 17.2 GB, 17179869184 bytes, 33554432 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x86979f60

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1            2048    33554431    16776192   8e  Linux LVM

Disk /dev/mapper/ol-root: 49.4 GB, 49379540992 bytes, 96444416 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/ol-swap: 8589 MB, 8589934592 bytes, 16777216 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

Partprobe

# partprobe -s
/dev/sda: msdos partitions 1 2 3 4
/dev/sdb: msdos partitions 1

pvcreate

# pvcreate /dev/sdb1
  Physical volume "/dev/sdb1" successfully created.

vgextend

# vgextend ol /dev/sdb1
  Volume group "ol" successfully extended

pvscan

# pvscan
  PV /dev/sda2   VG ol              lvm2 [<15.00 GiB / 0    free]
  PV /dev/sda3   VG ol              lvm2 [<29.00 GiB / 0    free]
  PV /dev/sda4   VG ol              lvm2 [<10.00 GiB / 0    free]
  PV /dev/sdb1   VG ol              lvm2 [<16.00 GiB / <16.00 GiB free]
  Total: 4 [69.98 GiB] / in use: 4 [69.98 GiB] / in no VG: 0 [0   ]

lvextend

# lvextend -L+16380M /dev/mapper/ol-root /dev/sdb1
  Size of logical volume ol/root changed from <45.99 GiB (11773 extents) to 61.98 GiB (15868 extents).
  Logical volume ol/root successfully resized.

xfs_growfs

# xfs_growfs /
meta-data=/dev/mapper/ol-root    isize=256    agcount=14, agsize=877824 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=0        finobt=0 spinodes=0 rmapbt=0
         =                       reflink=0
data     =                       bsize=4096   blocks=12055552, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=2560, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 12055552 to 16248832
# df -h
Filesystem           Size  Used Avail Use% Mounted on
devtmpfs             4.8G     0  4.8G   0% /dev
tmpfs                4.8G     0  4.8G   0% /dev/shm
tmpfs                4.8G  9.4M  4.8G   1% /run
tmpfs                4.8G     0  4.8G   0% /sys/fs/cgroup
/dev/mapper/ol-root   62G   42G   21G  68% /
/dev/sda1           1014M  419M  596M  42% /boot
tmpfs                973M   12K  973M   1% /run/user/42
tmpfs                973M     0  973M   0% /run/user/0

I followed this: https://ma.ttias.be/increase-expand-xfs-filesystem-in-red-hat-rhel-7-cento7/

Why would it work before but not now ?