raid5 vol growth

Use vxassist relayout to add a column to the volume (to use the extra disk), then use growby/growto to increase to the remaining available space.

Note the following from the vxassist man page:
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Note: Following a relayout, specify the attribute layout=nodiskalign to the growby and growto commands if you want the subdisks to be grown using contiguous disk space.
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# vxassist -g testdg relayout testvol layout=raid5 ncol=+1  ### see vxassist man page for further options if you need to use non-default stripe unit, etc

Once the relayout is done, volume will still be same size, grow to use the remaining space (using layout=nodiskalign as mentioned above)

# vxassist -g testdg growto testvol <size> layout=nodiskalign

For further details see:

vxassist man page: https://sort.symantec.com/public/documents/sf/5.0MP3/solaris/manpages/vxvm/man1m/vxassist.html

VxVM 5.0MP3 (Solaris) Administrator's Guide -> Performing online relayout -> Specifying a non-default layout
https://sort.symantec.com/public/documents/sf/5.0MP3/solaris/html/vxvm_admin/ch08s19s02.htm

The following technote also has helpful information for relayout and disk space requirements:

Disk space requirements for online relayout of concat, striped and RAID-5 volumes
http://www.symantec.com/docs/TECH20579