@Matt, did the above help?
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https://bugs.launchpad.net/bugs/1766308
Title:
inexplicably large file reported by zfs filesystem
Status in zfs-linux package in Ubuntu:
Triaged
Bug description:
I have a zfs filesystem containing a single qemu kvm disk image. The
vm has been working normally. The image file is only allocated 10G,
however today I became aware that the file, when examined from the ZFS
host (hypervisor) is reporting an inexplicable, massive file size of
around 12T. 12T is larger than the pool itself. Snapshots or other
filesystem features should not be involved. I'm suspicious that the
file(system?) has been corrupted.
root@fusion:~# ls -l /data/store/vms/plexee/
total 6164615
-rw-r--r-- 1 root root 12201321037824 Apr 23 11:49 plexee-root
^^ !!!!!!
root@fusion:~# qemu-img info /data/store/vms/plexee/plexee-root
image: /data/store/vms/plexee//plexee-root
file format: qcow2
virtual size: 10G (10737418240 bytes)
disk size: 5.9G
cluster_size: 65536
Format specific information:
compat: 1.1
lazy refcounts: false
refcount bits: 16
corrupt: false
root@fusion:~# zfs list rpool/DATA/fusion/store/vms/plexee
NAME USED AVAIL REFER MOUNTPOINT
rpool/DATA/fusion/store/vms/plexee 5.88G 484G 5.88G
/data/store/vms/plexee
root@fusion:~# zfs get all rpool/DATA/fusion/store/vms/plexee
NAME PROPERTY VALUE
SOURCE
rpool/DATA/fusion/store/vms/plexee type filesystem
-
rpool/DATA/fusion/store/vms/plexee creation Mon Mar 26 9:50
2018 -
rpool/DATA/fusion/store/vms/plexee used 5.88G
-
rpool/DATA/fusion/store/vms/plexee available 484G
-
rpool/DATA/fusion/store/vms/plexee referenced 5.88G
-
rpool/DATA/fusion/store/vms/plexee compressratio 1.37x
-
rpool/DATA/fusion/store/vms/plexee mounted yes
-
rpool/DATA/fusion/store/vms/plexee quota none
default
rpool/DATA/fusion/store/vms/plexee reservation none
default
rpool/DATA/fusion/store/vms/plexee recordsize 128K
default
rpool/DATA/fusion/store/vms/plexee mountpoint
/data/store/vms/plexee inherited from rpool/DATA/fusion
rpool/DATA/fusion/store/vms/plexee sharenfs off
default
rpool/DATA/fusion/store/vms/plexee checksum on
default
rpool/DATA/fusion/store/vms/plexee compression lz4
inherited from rpool
rpool/DATA/fusion/store/vms/plexee atime off
inherited from rpool
rpool/DATA/fusion/store/vms/plexee devices off
inherited from rpool
rpool/DATA/fusion/store/vms/plexee exec on
default
rpool/DATA/fusion/store/vms/plexee setuid on
default
rpool/DATA/fusion/store/vms/plexee readonly off
default
rpool/DATA/fusion/store/vms/plexee zoned off
default
rpool/DATA/fusion/store/vms/plexee snapdir hidden
default
rpool/DATA/fusion/store/vms/plexee aclinherit restricted
default
rpool/DATA/fusion/store/vms/plexee canmount on
default
rpool/DATA/fusion/store/vms/plexee xattr on
default
rpool/DATA/fusion/store/vms/plexee copies 1
default
rpool/DATA/fusion/store/vms/plexee version 5
-
rpool/DATA/fusion/store/vms/plexee utf8only off
-
rpool/DATA/fusion/store/vms/plexee normalization none
-
rpool/DATA/fusion/store/vms/plexee casesensitivity sensitive
-
rpool/DATA/fusion/store/vms/plexee vscan off
default
rpool/DATA/fusion/store/vms/plexee nbmand off
default
rpool/DATA/fusion/store/vms/plexee sharesmb off
default
rpool/DATA/fusion/store/vms/plexee refquota none
default
rpool/DATA/fusion/store/vms/plexee refreservation none
default
rpool/DATA/fusion/store/vms/plexee primarycache all
default
rpool/DATA/fusion/store/vms/plexee secondarycache all
default
rpool/DATA/fusion/store/vms/plexee usedbysnapshots 0
-
rpool/DATA/fusion/store/vms/plexee usedbydataset 5.88G
-
rpool/DATA/fusion/store/vms/plexee usedbychildren 0
-
rpool/DATA/fusion/store/vms/plexee usedbyrefreservation 0
-
rpool/DATA/fusion/store/vms/plexee logbias latency
default
rpool/DATA/fusion/store/vms/plexee dedup off
default
rpool/DATA/fusion/store/vms/plexee mlslabel none
default
rpool/DATA/fusion/store/vms/plexee sync standard
default
rpool/DATA/fusion/store/vms/plexee refcompressratio 1.37x
-
rpool/DATA/fusion/store/vms/plexee written 5.88G
-
rpool/DATA/fusion/store/vms/plexee logicalused 7.94G
-
rpool/DATA/fusion/store/vms/plexee logicalreferenced 7.94G
-
rpool/DATA/fusion/store/vms/plexee filesystem_limit none
default
rpool/DATA/fusion/store/vms/plexee snapshot_limit none
default
rpool/DATA/fusion/store/vms/plexee filesystem_count none
default
rpool/DATA/fusion/store/vms/plexee snapshot_count none
default
rpool/DATA/fusion/store/vms/plexee snapdev hidden
default
rpool/DATA/fusion/store/vms/plexee acltype off
default
rpool/DATA/fusion/store/vms/plexee context none
default
rpool/DATA/fusion/store/vms/plexee fscontext none
default
rpool/DATA/fusion/store/vms/plexee defcontext none
default
rpool/DATA/fusion/store/vms/plexee rootcontext none
default
rpool/DATA/fusion/store/vms/plexee relatime off
default
rpool/DATA/fusion/store/vms/plexee redundant_metadata all
default
rpool/DATA/fusion/store/vms/plexee overlay off
default
root@fusion:~# dpkg -l | grep zfs
ii libzfs2linux 0.6.5.6-0ubuntu20
amd64 Native OpenZFS filesystem library for Linux
ii zfs-dkms 0.6.5.6-0ubuntu20
amd64 Native OpenZFS filesystem kernel modules for Linux
ii zfs-doc 0.6.5.6-0ubuntu20
all Native OpenZFS filesystem documentation and examples.
ii zfs-initramfs 0.6.5.6-0ubuntu20
all Native OpenZFS root filesystem capabilities for Linux
ii zfs-zed 0.6.5.6-0ubuntu20
amd64 OpenZFS Event Daemon (zed)
ii zfsutils-linux 0.6.5.6-0ubuntu20
amd64 Native OpenZFS management utilities for Linux
root@fusion:~# uname -a
Linux fusion 4.13.0-38-generic #43~16.04.1-Ubuntu SMP Wed Mar 14 17:48:43 UTC
2018 x86_64 x86_64 x86_64 GNU/Linux
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