Re: bhyve, ZFS, and disk IO stats

Reply: Oleksandr Kryvulia : "Re: bhyve, ZFS, and disk IO stats"
In reply to: Zane C. B-H: "bhyve, ZFS, and disk IO stats"
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From: Zane C. B-H <v.velox_at_vvelox.net>
Date: Fri, 15 Jul 2022 05:39:23 UTC

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?