Re: ZFS dataset stats

ZFS with the volmode set to dev being used by bhyve on FreeBSD
stable/12-n234444-680eb3fd094.

/usr/bin/lockf -s -t0 /storage/cbsd/tmp/bhyveload.debian10_test.lock env
LIB9P_LOGGING=/storage/cbsd/jails-system/debian10_test/cbsd_lib9p.log
/usr/bin/nice -n 1 /usr/sbin/bhyve -c 1 -m 4294967296 -H -A -U
2bc5ac97-8438-11ec-a89a-90b11c06ff98 -s 0,hostbridge -s
1,ahci-cd,/usr/local/cbsd/upgrade/patch/efirefd.fd,ro -s
4,virtio-blk,/storage/cbsd/vm/debian10_test/dsk1.vhd,sectorsize=512/4096 
-s
5,virtio-net,tap9,mac=00:a0:98:5c:63:1f -s 6,virtio-rnd -s
8,fbuf,tcp=127.0.0.1:5909,w=1024,h=768,password=cbsd -s 30,xhci,tablet 
-s 31,lpc

'/storage/cbsd/vm/debian10_test/dsk1.vhd' is just a symlink to
'/dev/zvol/storage/debian10_test/dsk1.vhd'.

And ztop also fails here as well.

On 2022-07-15 07:59, Alan Somers wrote:
> You didn't say how you were accessing that dataset, or what FreeBSD
> version you're using.  The dataset stats to update as expected in
> response to normal user I/O, but not zfs send/recv.  Maybe there is
> another path that bypasses them too.  How are you accessing them?
> 
> BTW, sysutils/ztop from ports displays real-time measurements based on
> these stats.
> -Alan
> 
> On Thu, Jul 14, 2022 at 11:05 PM Zane C. B-H <v.velox@vvelox.net> 
> wrote:
>> 
>> So was just looking and for some reason nread etc for the ZFS storage
>> stats.
>> 
>> Below is a example of a ZFS dataset being used by CBSD to store a raw
>> disk image,
>> one that is running currently, but for some reasonn the R/W stats 
>> don't
>> seem actually update.
>> 
>> 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
>> 
>> Is there any way to get ZFS to actually keep these up to date for use
>> cases
>> like this?
>>