illumos gate

Testing Notes (Supplemental)¶

I installed OpenIndiana in a QEMU/KVM guest on an Ubuntu system. By default, virt-manager doesn't allow you to adjust the block size, so the device was a 512 byte native Virtio block device. The root pool was created with ashift of 9.

I was able to edit /etc/libvirt/qemu/$GUESTNAME.xml to edit the disk object to act like a 512e device (512 logical, 4096 physical):

...
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2'/>
      <source file='/var/lib/libvirt/images/generic-3-1.qcow2'/>
      <blockio logical_block_size='512' physical_block_size='4096'/>
      <target dev='vda' bus='virtio'/>
      <boot order='1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
    </disk>
...

After running systemctl restart libvirtd I restarted the guest and was able to boot it.

I added a second disk (size 4GB) and made it 4k native using the same procedure. Looking inside the guest:

root@openindiana:~# diskinfo
TYPE    DISK                    VID      PID              SIZE          RMV SSD
-       c4t0d0                  Virtio   Block Device       20.00 GiB   no  no 
-       c6t0d0                  Virtio   Block Device        4.00 GiB   no  no 
root@openindiana:~# mdb -ke '::prtconf -d vioblk | ::devinfo -d | ::printf "%p: %5d %5d %d\n" vioblk_t . vib_blk_size vib_pblk_size vib_nblks'
ffffff0186a83680:   512  4096 41943040
ffffff018e239a80:  4096  4096 1048576
root@openindiana:~# zpool create extra c6t0d0
root@openindiana:~# zdb extra | grep ashift
                ashift: 12
                ashift: 12
...

The 4GB capacity for the 4k native device is correctly reflected in both diskinfo and in the block size. I copied some data into the pool and completed a successful scrub.