Date: Mon, 14 May 2018 15:33:48 +0000 From: Paul Esson <paul.esson@redstor.com> To: "freebsd-virtualization@freebsd.org" <freebsd-virtualization@freebsd.org> Subject: Releasing deleted blocks from a sparse ZVOL used by bhyve guest Message-ID: <AM5PR0102MB2578DE9126D44781DBAB54CD9E9C0@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 data disk for a bhyve FreeBSD 11.1-RELEASE guest that in turn uses this device as the source for a ZFS filesystem. When I delete data from the filesystem on the guest this is reflected in its used space, but not in the ZVOL on the host. I've read suggestions that the use of a block driver that supports 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 switch 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 2018 - 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 t +44 (0)118 951 5235 | m +44 (0)776 690 6514 e paul.esson@redstor.com<mailto:paul.esson@redstor.com> www.redstor.com<http://www.redstor.com/>; [http://partners.redstor.com/files/redstor_email_signatures_linkedin_icon_padding.png]<https://www.linkedin.com/company/50079>[http://partners.redstor.com/files/redstor_email_signatures_twitter_icon_padding.png]<https://twitter.com/@redstor>[http://partners.redstor.com/files/redstor_email_signatures_facebook_icon_padding.png]<https://www.facebook.com/Redstor/>[http://partners.redstor.com/files/redstor_email_signatures_youtube_icon_padding.png]<https://www.youtube.com/user/RedstorVideo>; [http://partners.redstor.com/files/NEW_logo_larger.png]<http://www.redstor.com/>; [cid:image001.jpg@01D3EB9E.9D818E70]<https://www.redstor.com/en-gb/storage-analyser>;help
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