Solaris 10: after go from IDE to SATA a "ghost disk" appear

I run Solaris 10 in Qemu vm on Linux host. All works fine (sata, usb, etc..) I ran on IDE because on some old version of libvirt/qemu Solaris 10 gave a lot of error (ioapic timeout and similar) if installed on SATA disk. Now finally those error disappear. To "migrate" Solaris from IDE to SATA I have only updated libvirt configuration (remove ide disk, add sata disk using old ide disk). Works fine but... From where vold take the information? On /etc/ the string c2t0d0s7 is only on file /etc/lvm/md.conf.