Date: Fri, 15 Jul 2022 00:39:23 -0500 From: "Zane C. B-H" <v.velox@vvelox.net> To: emulation@freebsd.org Subject: Re: bhyve, ZFS, and disk IO stats Message-ID: <e02364e57780093fe041fc74b05b7af3@vvelox.net> In-Reply-To: <a197abccaa213ca15b8d3de7e1f829f6@vvelox.net> References: <a197abccaa213ca15b8d3de7e1f829f6@vvelox.net>
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To expand on this, 'bhyvectl --get-stats' returns lots of info, but no disk IO stats. On 2022-07-15 00:33, Zane C. B-H wrote: > So with bhyve, is there any good way to get disk IO stats for a VM when > it is > using ZFS for a dataset. > > Apparently ZFS only tracks RW stats for mounted disks, but not raw > disks stored > as a ZFS dataset. Below is a running VM, but the stats reported are all > zero. > > kstat.zfs.storage.dataset.objset-0x1d41.nread: 0 > kstat.zfs.storage.dataset.objset-0x1d41.reads: 0 > kstat.zfs.storage.dataset.objset-0x1d41.nwritten: 0 > kstat.zfs.storage.dataset.objset-0x1d41.writes: 0 > kstat.zfs.storage.dataset.objset-0x1d41.dataset_name: > storage/debian10_test/dsk1.vhd > > Can't use gstat as ZFS datasets don't show up as GEOM devices it > appears. > > iostat has the same issue. > > 'zfs get all' for the dataset in question does not return any RW stats. > > Any one have any thoughts on this?
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