Date: Mon, 14 May 2018 20:55:05 +0000 From: Paul Esson <paul.esson@redstor.com> To: Eric Borisch <eborisch@gmail.com>, =?iso-8859-1?Q?Karli_Sj=F6berg?= <karli@inparadise.se> Cc: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: Re: Releasing deleted blocks from a sparse ZVOL Message-ID: <HE1PR0102MB2588BF153F2FB8DA604D7C519E9C0@HE1PR0102MB2588.eurprd01.prod.exchangelabs.com> In-Reply-To: <CAMsT2=k%2BcW7GheH945rp-hX4Er6rpUvrRghXEgj1=VchdEotxQ@mail.gmail.com> References: <AM5PR0102MB2578E94BA1F8894339FEB93C9E9C0@AM5PR0102MB2578.eurprd01.prod.exchangelabs.com> <FCD89CD5-B86F-41EB-A30B-6ABF67D4630A@inparadise.se>, <CAMsT2=k%2BcW7GheH945rp-hX4Er6rpUvrRghXEgj1=VchdEotxQ@mail.gmail.com>
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Hi Eric, Thanks for your feedback which sounds encouraging. I'll give that a try. Regards, Paul.E Paul Esson | Redstor Limited t +44 (0)118 951 5235 m +44 (0)776 690 6514 e paul.esson@redstor.com ________________________________ From: eborisch@alumni.stanford.edu <eborisch@alumni.stanford.edu> on behalf of Eric Borisch <eborisch@gmail.com> Sent: Monday, May 14, 2018 9:37:43 PM To: Karli Sjöberg Cc: Paul Esson; freebsd-fs@freebsd.org Subject: Re: Releasing deleted blocks from a sparse ZVOL I've had success in a similar config by attaching the zvol as 'ahci-hd', which shows up as a 'BHYVE SATA DISK' in a BSD guest. With such a guest (running a zpool on the attached device): kstat.zfs.misc.zio_trim.failed: 0 kstat.zfs.misc.zio_trim.unsupported: 0 kstat.zfs.misc.zio_trim.success: 179883 kstat.zfs.misc.zio_trim.bytes: 13126696960 Also working with a linux guest. I see the expected tracking of the 'logicalreferenced' size in the host with the ALLOC size in the guest (allowing for upward bias due to using 32k sector sizes on my zvols). Note that TRIM and UNMAP are two extremely similar but distinct (used for SATA & SCSI, respectively) commands. Both are commonly referred to as 'trim' by layers above the device drivers. - Erichelp
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