> On Mar 10, 2016, at 5:31 PM, Paul Vixie <p...@redbarn.org> wrote: > > 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.
At the risk of getting farther off-topic.. Virtio-blk can't and won't support fstrim. If/when bhyve were to have virtio-scsi support that could work with trim, but last I was aware there wasn't a whole lot of momentum in that direction. The virtual AHCI controller in bhyve does support trim and performs remarkably well. That's what I use for my vol-backed VMs and I haven't had any complaints. Worth testing, IMO. JN _______________________________________________ freebsd-virtualization@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-virtualization To unsubscribe, send any mail to "freebsd-virtualization-unsubscr...@freebsd.org"
