https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247367
Bug ID: 247367
Summary: Sometimes, GPT-labeled partitions don't appear in
/dev/gpt/ in a FreeBSD BHYVE guest
Product: Base System
Version: 12.1-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bhyve
Assignee: [email protected]
Reporter: [email protected]
Actual result
-------------
According to "glabel", my disk has 3 GPT labels:
root@nova:~ # gpart show -l
=> 40 41942960 vtbd0 GPT (20G)
40 216 - free - (108K)
256 1024 1 boot0 (512K)
1280 39844608 2 root0 (19G)
39845888 2097112 3 swap0 (1.0G)
But in /dev/gpt/, only boot0 is detected.
root@nova:~ # ls /dev/gpt
boot0
Also, "glabel refresh" fails too:
root@nova:~ # glabel refresh vtbd0
Can't refresh metadata from vtbd0: Operation not permitted.
I don't think that GPT labels depends on the type of disk (VirtIO, AHCI/SATA,
, SCSI, and so on).
Expected result
---------------
I expect to see 3 entries in /dev/gpt/, namely:
- /dev/gpt/boot0
- /dev/gpt/root0
- /dev/gpt/swap0
I am only seeing /dev/gpt/boot0.
Why this is important
---------------------
This is annoying because in the BHYVE guest config file, I want to change
the disk type from virtio-blk to ahci-hd since virtio-blk does not support TRIM
and ahci-hd does.
In Linux, I use /dev/disk/by-uuid/* to avoid using the
/dev/something-not-portable.
BHYVE guest config
------------------
root@atlantis:~ # cat /tank/vm-bhyve/nova/nova.conf
loader="bhyveload"
cpu=1
memory=256M
network0_type="virtio-net"
network0_switch="public"
disk0_type="virtio-blk"
disk0_name="disk0"
disk0_dev="zvol"
uuid="788979be-a7b4-11ea-a49d-a8a15906202d"
network0_mac="58:9c:fc:0c:50:9c"
Disk ZVOL in the BHYVE host
---------------------------
Inside the VM, only 5.4G is Used:
root@nova:~ # df -h /
Filesystem Size Used Avail Capacity Mounted on
/dev/vtbd0p2 18G 5.4G 12G 32% /
But the FreeBSD 12.1 guest has a ZVOL with REFER=20.1G:
root@atlantis:~ # zfs list tank/vm-bhyve/nova/disk0
NAME USED AVAIL REFER MOUNTPOINT
tank/vm-bhyve/nova/disk0 20.6G 5.04T 20.1G -
Comparison with a Debian guest
------------------------------
Inside the VM, Used is 1.1G.
capside@capside:~$ df -h /
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 125G 1.1G 118G 1% /
And the corresponding ZVOL has a REFER=4.13G.
root@atlantis:~ # zfs list tank/vm-bhyve/capside/disk0
NAME USED AVAIL REFER MOUNTPOINT
tank/vm-bhyve/capside/disk0 132G 5.17T 4.13G -
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