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You can nest virtual disks inside one another provided that you do not nest a virtual disk that has redundancy (mirrors and RAID 4/5) inside another virtual disk with redundancy. Doing this may cause the virtual disk driver to hang and suspend access to all configured virtual disks.
Three-way mirrors (created by nesting a mirror within a mirror) are an exception. You can configure these provided the master piece of the top level mirror is the second mirror. To configure vdisk5 as a 3-way mirror in the /etc/dktab file:
/dev/dsk/vdisk4 mirror 2 32
/dev/dsk/1s1 2016 3200
/dev/dsk/2s1 2016 3200
/dev/dsk/vdisk5 mirror 2 32
/dev/dsk/vdisk4 0 3200
/dev/dsk/3s1 2016 3200
The Virtual Disk Manager nests the
disk definitions in /etc/dktab correctly.
If you edit /etc/dktab manually,
ensure that definitions of virtual disks used as pieces occur before the
definition of the virtual disk that references them.