Date: Mon, 14 May 2018 15:35:21 +0000 From: Paul Esson <paul.esson@redstor.com> To: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: Releasing deleted blocks from a sparse ZVOL Message-ID: <AM5PR0102MB2578E94BA1F8894339FEB93C9E9C0@AM5PR0102MB2578.eurprd01.prod.exchangelabs.com>
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Hi Folks,
I'm attempting to use a sparse ZVOL from a FreeBSD 11.1-RELEASE host as a d=
ata disk for a bhyve FreeBSD 11.1-RELEASE guest that in turn uses this devi=
ce as the source for a ZFS filesystem. When I delete data from the filesys=
tem on the guest this is reflected in its used space, but not in the ZVOL o=
n the host. I've read suggestions that the use of a block driver that supp=
orts TRIM or SCSi unmap is crucial such as virtio-scsi, but from what I can=
tell my vm-bhyve implementation is using virtio - certainly the disk1_type=
parameter in the configuration file has a value of "virtio-blk".
Can anyone confirm this is indeed the issue and whether it is possible to s=
witch to the relevant driver? Or am I barking up the wrong tree altogether=
?
Host ZFS Filesystem
NAME PROPERTY VALUE SOURCE
dc1-hn-01 type filesystem -
dc1-hn-01 creation Mon Apr 23 14:35 2018 -
dc1-hn-01 used 36.7G -
dc1-hn-01 available 78.2T -
dc1-hn-01 referenced 201K -
dc1-hn-01 compressratio 1.00x -
dc1-hn-01 mounted yes -
dc1-hn-01 quota none default
dc1-hn-01 reservation none default
dc1-hn-01 recordsize 128K default
dc1-hn-01 mountpoint /export/data/dc1-hn-01 local
dc1-hn-01 sharenfs off default
dc1-hn-01 checksum on default
dc1-hn-01 compression off default
dc1-hn-01 atime on default
dc1-hn-01 devices on default
dc1-hn-01 exec on default
dc1-hn-01 setuid on default
dc1-hn-01 readonly off default
dc1-hn-01 jailed off default
dc1-hn-01 snapdir hidden default
dc1-hn-01 aclmode discard default
dc1-hn-01 aclinherit restricted default
dc1-hn-01 canmount on default
dc1-hn-01 xattr off temporary
dc1-hn-01 copies 1 default
dc1-hn-01 version 5 -
dc1-hn-01 utf8only off -
dc1-hn-01 normalization none -
dc1-hn-01 casesensitivity sensitive -
dc1-hn-01 vscan off default
dc1-hn-01 nbmand off default
dc1-hn-01 sharesmb off default
dc1-hn-01 refquota none default
dc1-hn-01 refreservation none default
dc1-hn-01 primarycache all default
dc1-hn-01 secondarycache all default
dc1-hn-01 usedbysnapshots 0 -
dc1-hn-01 usedbydataset 201K -
dc1-hn-01 usedbychildren 36.7G -
dc1-hn-01 usedbyrefreservation 0 -
dc1-hn-01 logbias latency default
dc1-hn-01 dedup off default
dc1-hn-01 mlslabel -
dc1-hn-01 sync standard default
dc1-hn-01 refcompressratio 1.00x -
dc1-hn-01 written 201K -
dc1-hn-01 logicalused 4.12G -
dc1-hn-01 logicalreferenced 36.5K -
dc1-hn-01 volmode default default
dc1-hn-01 filesystem_limit none default
dc1-hn-01 snapshot_limit none default
dc1-hn-01 filesystem_count none default
dc1-hn-01 snapshot_count none default
dc1-hn-01 redundant_metadata all default
Host ZFS volume - used by vm-bhyve guest
NAME PROPERTY VALUE =
SOURCE
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 type volume =
-
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 creation Wed May 2 14:06 2=
018 -
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 used 4.70G =
-
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 available 78.2T =
-
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 referenced 4.70G =
-
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 compressratio 1.00x =
-
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 reservation none =
default
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 volsize 28T =
local
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 volblocksize 8K =
-
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 checksum on =
default
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 compression off =
default
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 readonly off =
default
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 copies 1 =
default
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 refreservation none =
default
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 primarycache all =
default
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 secondarycache all =
default
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 usedbysnapshots 0 =
-
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 usedbydataset 4.70G =
-
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 usedbychildren 0 =
-
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 usedbyrefreservation 0 =
-
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 logbias latency =
default
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 dedup off =
default
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 mlslabel =
-
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 sync standard =
default
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 refcompressratio 1.00x =
-
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 written 4.70G =
-
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 logicalused 2.06G =
-
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 logicalreferenced 2.06G =
-
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 volmode dev =
local
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 snapshot_limit none =
default
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 snapshot_count none =
default
dc1-hn-01/vm/dc1-olbp-sn-11/disk1 redundant_metadata all =
default
Guest ZFS Filesystem
NAME PROPERTY VALUE SOURCE
dc1-sn-11 type filesystem -
dc1-sn-11 creation Wed May 2 15:49 2018 -
dc1-sn-11 used 752K -
dc1-sn-11 available 26.9T -
dc1-sn-11 referenced 176K -
dc1-sn-11 compressratio 1.00x -
dc1-sn-11 mounted yes -
dc1-sn-11 quota none default
dc1-sn-11 reservation none default
dc1-sn-11 recordsize 128K default
dc1-sn-11 mountpoint /export/data/dc1-sn-11 local
dc1-sn-11 sharenfs off default
dc1-sn-11 checksum on default
dc1-sn-11 compression off default
dc1-sn-11 atime on default
dc1-sn-11 devices on default
dc1-sn-11 exec on default
dc1-sn-11 setuid on default
dc1-sn-11 readonly off default
dc1-sn-11 jailed off default
dc1-sn-11 snapdir hidden default
dc1-sn-11 aclmode discard default
dc1-sn-11 aclinherit restricted default
dc1-sn-11 canmount on default
dc1-sn-11 xattr off temporary
dc1-sn-11 copies 1 default
dc1-sn-11 version 5 -
dc1-sn-11 utf8only off -
dc1-sn-11 normalization none -
dc1-sn-11 casesensitivity sensitive -
dc1-sn-11 vscan off default
dc1-sn-11 nbmand off default
dc1-sn-11 sharesmb off default
dc1-sn-11 refquota none default
dc1-sn-11 refreservation none default
dc1-sn-11 primarycache all default
dc1-sn-11 secondarycache all default
dc1-sn-11 usedbysnapshots 0 -
dc1-sn-11 usedbydataset 176K -
dc1-sn-11 usedbychildren 576K -
dc1-sn-11 usedbyrefreservation 0 -
dc1-sn-11 logbias latency default
dc1-sn-11 dedup off default
dc1-sn-11 mlslabel -
dc1-sn-11 sync standard default
dc1-sn-11 refcompressratio 1.00x -
dc1-sn-11 written 176K -
dc1-sn-11 logicalused 153K -
dc1-sn-11 logicalreferenced 55K -
dc1-sn-11 volmode default default
dc1-sn-11 filesystem_limit none default
dc1-sn-11 snapshot_limit none default
dc1-sn-11 filesystem_count none default
dc1-sn-11 snapshot_count none default
dc1-sn-11 redundant_metadata all default
Regards,
Paul Esson | Redstor Limited
e paul.esson@redstor.com<mailto:paul.esson@redstor.com>
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