Hi,

"df -h" on the OSD host shows 187G is being used.
"du -sh /" shows 36G. bluefs_buffered_io is enabled here.
What's  taking that 150G disk space, cache?
Then where is that cache file? Any way to configure it smaller?

# free -h
              total        used        free      shared  buff/cache   available
Mem:          187Gi        28Gi       4.4Gi       4.1Gi       154Gi       152Gi
Swap:         8.0Gi        82Mi       7.9Gi

# df -h
Filesystem            Size  Used Avail Use% Mounted on
devtmpfs               94G     0   94G   0% /dev
tmpfs                  94G     0   94G   0% /dev/shm
tmpfs                  94G  4.2G   90G   5% /run
tmpfs                  94G     0   94G   0% /sys/fs/cgroup
/dev/mapper/vg0-root  215G  187G   29G  87% /
/dev/sdk2             239M  150M   72M  68% /boot
/dev/sdk1             250M  6.9M  243M   3% /boot/efi
overlay               215G  187G   29G  87% 
/var/lib/docker/overlay2/bc4904d8da14dd9ab0fbc49ae60f20ba4a3cbf8f361c0ed13e818e0d65e22531/merged
overlay               215G  187G   29G  87% 
/var/lib/docker/overlay2/617494be5e05d5f91d1d08aad6b6ace8f335a346ca9ea868dc2bc7fd07906901/merged
overlay               215G  187G   29G  87% 
/var/lib/docker/overlay2/3b039d5daffaf212d3384afc30b5bf75353fd215b238101b9bfba4050638eab5/merged
overlay               215G  187G   29G  87% 
/var/lib/docker/overlay2/507c24e65c7cd075b5e1ab4901f8e198263c85265b3e4610606dc3dfd4dad0b5/merged
overlay               215G  187G   29G  87% 
/var/lib/docker/overlay2/6856e867322a73cb1d0e203a2c12f8516bd76fa3866a945b199e477396704f76/merged
overlay               215G  187G   29G  87% 
/var/lib/docker/overlay2/5bb197c41ba584981d1767e377bff84cd13750476a63f26206f58b274d854739/merged
overlay               215G  187G   29G  87% 
/var/lib/docker/overlay2/1c2b16f94ffda06fc277c6906e6df8bd150de16c80a1ba7f113f0774ad8a5de1/merged
overlay               215G  187G   29G  87% 
/var/lib/docker/overlay2/58de1f5b8e3638e94cbc55f02f690937295e8714dfea44f155271df70093a69f/merged
overlay               215G  187G   29G  87% 
/var/lib/docker/overlay2/be5d6ac02ab83436b18c475f43df48732c0b2b5c73732237064631deb2d5243f/merged
overlay               215G  187G   29G  87% 
/var/lib/docker/overlay2/e59810bd48f0667bd3f91dcc65ec1b51227314754dfbcc7ba8dee376bdcd4c0a/merged
overlay               215G  187G   29G  87% 
/var/lib/docker/overlay2/78326ce8e1cf36680eaa56e744b4ea97f1b358adac17eacaf67b88937dd5e876/merged
overlay               215G  187G   29G  87% 
/var/lib/docker/overlay2/6a53cf14e33b69c418794514fbd35f5257c553f5a9b0ead62e03b76163112de4/merged
overlay               215G  187G   29G  87% 
/var/lib/docker/overlay2/efec8e5382be117acdbfc81e9d9a9fbc62e289c2a9fcdfa4c53868de50faf420/merged
overlay               215G  187G   29G  87% 
/var/lib/docker/overlay2/eca247de3d54f43372961146b84b485d7c5715d1784afae83e44763717ecf552/merged
tmpfs                  19G     0   19G   0% /run/user/0
overlay               215G  187G   29G  87% 
/var/lib/docker/overlay2/bfdf90bdc15c9059d9436caddb1d927788ae9eeff15df631ed150cae966528eb/merged
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