Michael W Lucas Mar 6

Hey #freebsd #bhyve users!

I'm trying to test draid virtually for #openzfsmastery, because nobody's gonna give me a shelf of 60 disks to play with. I set everything up like:

disk35_name="disk35"
disk35_type="ahci-hd"
disk35_dev="sparse-zvol"

Seems that if I have 35 ahci-hd entries, disk0 through disk34, bhyve and freebsd works. At disk35, the host panics on boot.

Is this expected with bhyve? Or does FreeBSD need a special tweak with 36 disks?

Show threaddch  Mar 6

@mwl have you tried this with NVMe type as disk? s/virtio-blk/nvme/ for the type.

also maybe it runs out of “pci slots” try adding this:

ahci_device_limit="8"

I’ll try this tomorrow and see what comes up

Show threadMichael W Lucas Mar 7
@dch I have not, good idea! maybe virtio as well? Gonna play around some this weekend...
Show threadJason Tubnor 🇦🇺Mar 7
@mwl @dch I did as part of my testing. I use NVMe devices for everything, no matter the underlying storage (thanks @ctuffli ). FWIW ahci-hd should only used for compatibility requirements (usually to get virtio drivers onboard for Windows guests) as it dog slow.
Show threadChuck TuffliMar 7
@Tubsta @dch @mwl hopefully goes without saying, but yell at me if a virtual shelf of N NVMe disks in bhyve doesn’t work
Show threadJason Tubnor 🇦🇺Mar 7
@ctuffli @dch @mwl You might know the current state, what is the pci device limit currently in bhyve? I think it is 32 but might be wrong
Show threadChuck TuffliMar 7
@Tubsta @dch @mwl bhyve "slot" specification in the max is bus:pcislot:function where bus is 0-255, pcislot is 0-31, and function is 0-7. If the maths don't fail me, that is around 64k-ish devices
Show threadMichael DexterMar 7

@ctuffli @Tubsta @dch @mwl So, we talking bhyve or vm-bhyve?

I would not be surprised if vm-bhyve doesn’t assume that, “no one would ever want more than 8 devices”, or at least devices of one type.

Have you tried raw bhyve?

Show threadMichael W Lucas Mar 7
@dexter @ctuffli @Tubsta @dch vm-bhyve, because I'm lazy
Show threadJason Tubnor 🇦🇺Mar 7
@mwl @dexter @ctuffli @dch No, not lazy. You just want consistency because fat fingers on a massive native command line just gives you headaches you don’t need (well that is my excuse) #repeatable #bhyve
Show threadMichael W Lucas Mar 8

@Tubsta @dch @dexter @ctuffli

bhyve seems to work well, but yeah, those command lines are 

Show threadMichael DexterMar 8

@mwl @Tubsta @dch @ctuffli I am speaking purely from a diagnostics perspective. I believe, to their credit, their log shows the command that was executed. Which is kinda important, given the many “bhyve” bugs along the lines of “it’s treating my boot drive as if it is a CD-ROM drive …” #TrueStory!

So yeah. Share the underlying actual stuff please because very few vm-bhyve bugs are bhyve bugs.

Show threadJason Tubnor 🇦🇺
@dexter @mwl @dch @ctuffli That is how I found the issue yesterday. The logs are excellent in vm-bhyve.
Mar 8 at 2:32amWeb
Show threadMichael DexterMar 8
@Tubsta @dch @mwl @ctuffli Thar u go.