Oracle:

CREATE DISKGROUP

CREATE DISKGROUP diskgroup_name
[ { HIGH | NORMAL | EXTERNAL } REDUNDANCY ]
{ [ QUORUM | REGULAR ][ FAILGROUP failgroup_name ]
DISK qualified_disk_clause [, qualified_disk_clause]...
} ...
[ ATTRIBUTE { 'attribute_name' = 'attribute_value' }
[, 'attribute_name' = 'attribute_value' ]... ]
;

qualified_disk_clause::=
search_string
[ NAME disk_name ]
[ SIZE size_clause ]
[ FORCE | NOFORCE ]

example

CREATE DISKGROUP dgroup_01
EXTERNAL REDUNDANCY
DISK '/devices/disks/c*';