Date: Thu, 10 Mar 2016 16:31:58 -0800 From: Paul Vixie <paul@redbarn.org> To: =?UTF-8?B?0KHQtdGA0LPQtdC5INCc0LDQvNC+0L3QvtCy?= <mrqwer88@gmail.com> Cc: Pavel Odintsov <pavel.odintsov@gmail.com>, "freebsd-virtualization@freebsd.org" <freebsd-virtualization@freebsd.org>, Sergei Mamonov <mamonov@fastvps.ru> Subject: Re: ZFS subvolume support inside Bhyve vm Message-ID: <56E211FE.2060700@redbarn.org> In-Reply-To: <CAG2oxtrnmYpPznFiBfPARG69wBiCWdqn6ch_E64X=M33sVN-uw@mail.gmail.com> References: <CALgsdbcXxAnfkKnU9CuOE-pj0sJJpQ7-XFd6R0bFEeKB-maDRw@mail.gmail.com> <56E206FE.3080000@redbarn.org> <CAG2oxtrnmYpPznFiBfPARG69wBiCWdqn6ch_E64X=M33sVN-uw@mail.gmail.com>
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Сергей Мамонов wrote: > Hello! > > Yes - zvols looks awesome. But what driver you use for it? virtio-blk. > And what > about disk usage overhead in guest? ufs on zvol is faster, either in the parent or a bhyve using virtio-blk, than zfs. at least for writing, which is my dominant work load. i expect that this is due to zfs's compression logic rather than anything having to do with creating/extending files to accommodate writes. > virtio-blk doesnt support fstrim (ahci-hd support it, but slower? "/At > this point virtio-blk is indeed faster then ahci-hd on high IOPS/"). > In linux && kvm we try used virtio-scsi driver with support fstrim, but > how I see it not availble now in 10-2 stable for bhyve. > And I not lonely with this question - > https://lists.freebsd.org/pipermail/freebsd-virtualization/2015-March/003442.html i'm just going to live without fstrim until it's supported in virtio-blk. i know that this option isn't available to everybody, but at the moment storage is cheap enough to waste. -- P Vixie
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