xfs_growfs 3.2.1 on Knoppix-ADRIANE from Debian 7 does not grow

Hi, all --

I finally settled on xfs as the filesystem for my raid5 volume on my home computer even though I've been a longtime reiserfs lover :-) But, hey, let's try something new.

I recently added another device to my md raid5 set and expanded the device from 8T to 12T, and now I want to grow the filesystem. I remade the partition and we oughta be good to go:

diskfarm:root:10:~> parted /dev/md0 print | egrep 'TB|Table|Sector' Disk /dev/md0: 12.0TB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
1 1049kB 12.0TB 12.0TB xfs Linux filesystem

When I try xfs_growfs, however, nothing changes:

diskfarm:root:10:~> df -kh /mnt/4Traid5md/

  Filesystem      Size  Used Avail Use% Mounted on
  /dev/md0p1      7.3T  6.5T  863G  89% /mnt/4Traid5md
  diskfarm:root:10:~> xfs_growfs -d /mnt/4Traid5md/
  meta-data=/dev/md0p1             isize=256    agcount=32, agsize=61043072 blks
           =                       sectsz=4096  attr=2, projid32bit=1
           =                       crc=0        finobt=0
  data     =                       bsize=4096   blocks=1953377275, imaxpct=5
           =                       sunit=128    swidth=256 blks
  naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
  log      =internal               bsize=4096   blocks=521728, version=2
           =                       sectsz=4096  sunit=1 blks, lazy-count=1
  realtime =none                   extsz=4096   blocks=0, rtextents=0
  data size unchanged, skipping
  diskfarm:root:10:~> df -kh /mnt/4Traid5md/
  Filesystem      Size  Used Avail Use% Mounted on
  /dev/md0p1      7.3T  6.5T  863G  89% /mnt/4Traid5md

I've searched high and low and haven't found any indication of why I shouldn't be able to grow as long as the partition is large enough, so now it's time to dive into the mailing list :-)

Please bcc: me on your replies since I am not subscribed. I promise to follow up with my ongoing results :-)

TIA & HAND

:-D

David T-G
See http://justpickone.org/davidtg/email/
See http://justpickone.org/davidtg/tofu.txt

Did parted tell the kernel to reread the partition table?

blockdev --getsz /dev/md0p1 will tell us the kernel's view of how big md0p1 is right now.

unmount, blockdev --rereadpt /dev/md0, try again(?)

--D

Darrick, et al --

...and then Darrick J. Wong said...
%
% On Mon, Feb 27, 2017 at 09:37:24PM -0500, David T-G wrote:
% >
...
% > diskfarm:root:10:~> parted /dev/md0 print | egrep 'TB|Table|Sector'
...
% > 1 1049kB 12.0TB 12.0TB xfs Linux filesystem
% >
...
% > diskfarm:root:10:~> xfs_growfs -d /mnt/4Traid5md/
% > meta-data=/dev/md0p1 isize=256 agcount=32, agsize=61043072 blks
%
% Did parted tell the kernel to reread the partition table?

Well, I thought that it did, since I kept seeing the new size plus saw the larger partition, but I admit that I don't know, because ...

%
% blockdev --getsz /dev/md0p1 will tell us the kernel's view of how big % md0p1 is right now.
%
% unmount, blockdev --rereadpt /dev/md0, try again(?)

diskfarm:root:10:~> blockdev --getsz /dev/md0p1 15627018207
diskfarm:root:10:~> umount /mnt/4Traid5md diskfarm:root:10:~> blockdev --rereadpt /dev/md0 diskfarm:root:10:~> mount /mnt/4Traid5md diskfarm:root:10:~> df -kh !$
df -kh /mnt/4Traid5md

  Filesystem      Size  Used Avail Use% Mounted on
  /dev/md0p1      7.3T  6.5T  863G  89% /mnt/4Traid5md
  diskfarm:root:10:~> xfs_growfs -d !$
  xfs_growfs -d /mnt/4Traid5md
  meta-data=/dev/md0p1             isize=256    agcount=32, agsize=61043072 blks
           =                       sectsz=4096  attr=2, projid32bit=1
           =                       crc=0        finobt=0
  data     =                       bsize=4096   blocks=1953377275, imaxpct=5
           =                       sunit=128    swidth=256 blks
  naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
  log      =internal               bsize=4096   blocks=521728, version=2
           =                       sectsz=4096  sunit=1 blks, lazy-count=1
  realtime =none                   extsz=4096   blocks=0, rtextents=0

data blocks changed from 1953377275 to 2930066043 diskfarm:root:10:~> !df
df -kh /mnt/4Traid5md
Filesystem Size Used Avail Use% Mounted on
/dev/md0p1 11T 6.5T 4.5T 59% /mnt/4Traid5md

WOO HOO! That's awesome :-) Thanks so much!

Now I'm off to read the blockdev man pages to figure out what magick thou has given mee, good sirrah!

%
% --D

Thanks again to all & HAND

:-D

David T-G
See http://justpickone.org/davidtg/email/
See http://justpickone.org/davidtg/tofu.txt