FYI: xfs_freeze/thaw doesn't sync free space w/df output

Sorry for repost, but when I went to look at my email I found the original buried several pages
down in a response, and guessing that many or most people probably use threaded readers now,
they'd be unlikely to see this...

FWIW, 3 hours later, still hasn't sync'd automatically.

Shouldn't that be a bug?

-------- Original Message --------
Subject: Re: FYI: better workaround for updating 'df' info after 'rm' on xfs-vols

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It doesn't work at al.

.... I've deleted off 2.4T from an 11T volume in about 15 files. du reflects the actions:

Ishtar:/backups> du -sxh /backups/
9.6T /backups/
Ishtar:/backups> df .

df does not:

Filesystem Size Used Avail Use% Mounted on
/dev/mapper/Backups-Backups 11T 11T 14G 100% /backups

Any stats you want to debug this?
Ishtar:/backups> xfs_info /backups
meta-data=/dev/mapper/Backups-Backups isize=256 agcount=11, agsize=268435440 blks

         =                       sectsz=512   attr=2
data     =                       bsize=4096   blocks=2929458176, imaxpct=5
         =                       sunit=16     swidth=96 blks
naming   =version 2              bsize=4096   ascii-ci=0
log      =internal               bsize=4096   blocks=32768, version=2
         =                       sectsz=512   sunit=16 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
----
   from      to extents  blocks    pct
      1       1     861     861   0.02
      2       3    1424    3587   0.10
      4       7     913    3785   0.10
     16      31       2      52   0.00
    512    1023       2    1164   0.03
   1024    2047       1    1833   0.05
   2048    4095       2    5972   0.17
   8192   16383       1    8688   0.24
  32768   65535       2   94647   2.62
  65536  131071       2  190992   5.29
 262144  524287       3 1230194  34.10
1048576 2097151       1 2066103  57.27

total free extents 3214
total free blocks 3607878 ### well at 4k/block, that's 1.4T which is about
right
average free extent size 1122.55
xfs_db> q
So why df
Ishtar:/backups> df .
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/Backups-Backups 11T 11T 14G 100% /backups
Ishtar:law/test> mount -l|grep backups
/dev/mapper/Backups-Backups on /backups type xfs (rw,noatime,nodiratime,swalloc,attr2,largeio,inode64,allocsize=131072k,logbsize=256k,sunit=128,swidth=768,noquota) [Backups]
--- reality check -- swidth DOES mean total width, right? i.e. 768/128 = 6
disks wide which is a
correct number of data disks in the array.

BTW, I'm wondering if my alignment is important or correct on it:
parted -l on the volume shows:
Disk /dev/sdb: 12.0TB
Sector size (logical/physical): 512B/512B
Partition Table: gpt_sync_mbr

Number  Start   End     Size    File system  Name    Flags
 1      17.4kB  12.0TB  12.0TB               backup  lvm

(i.e. it's not starting @ 0)
sudo pvs /dev/sdb1 -o +pe_start,pvseg_start
PV VG Fmt Attr PSize PFree 1st PE Start
/dev/sdb1 Backups lvm2 a-- 10.91t 0 512.00k 0
sudo vgs Backups -o +vg_mda_size,vg_mda_copies,vg_extent_size
VG #PV #LV #SN Attr VSize VFree VMdaSize #VMdaCps Ext
Backups 1 1 0 wz--n- 10.91t 0 188.00k unmanaged 4.00m

my system's xfs settings:

Ishtar:/proc/sys/fs/xfs> for i in *
do
printf "%30s: %-10s\n" "$i" $(<"$i")
done

          age_buffer_centisecs: 1500
                   error_level: 3
          filestream_centisecs: 3000
               inherit_noatime: 1
              inherit_nodefrag: 1
                inherit_nodump: 1
            inherit_nosymlinks: 0
                  inherit_sync: 1
             irix_sgid_inherit: 0
             irix_symlink_mode: 0
                    panic_mask: 0
                     rotorstep: 1

speculative_prealloc_lifetime: 300
stats_clear: 0
xfsbufd_centisecs: 100
xfssyncd_centisecs: 3000
---------------

Also I don't understand. does irix_sgid_inherit mean something other than directories created in a dir with the sgid bit set also get it set with the same group ownership?

As I just tested it .. made a dir set the group & chmod g+s.. made a dir in it, and it got created w/same group and w/sgid bit set.
But looking at the above, I'd think the sgid bit wasn't supposed to be inherited...(I can go look it up, but just looked strange).

----
In the ~54 minutes it took to write this:

Filesystem Size Used Avail Use% Mounted on
/dev/mapper/Backups-Backups 11T 11T 14G 100% /backups

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