Users can name the following objects:
Classes
Disks (excluding shadow disk)
Groups
Volumes
The object name can contain a maximum of 32 alphanumeric characters, including the hyphen (-) and the underscore character (_). However, in the event of the single disk name, the length limit is a maximum of 28 alphanumeric characters.
The object name cannot start with the hyphen (-) or the underscore character (_). Be sure to assign an alphanumeric character to the first character in the object name.
The class name must be unique within the entire system (for a cluster system, within the entire cluster system). For this reason, an error occurs if you try to create more than one disk class with the same name.
The other object names are unique within the class and an attempt to create more than one object with the same name in a class will result in an error.
GDS assigns slice names by combining the names of disks, groups, and volumes to which the slices belong. The slice naming conventions are as follows.
When the slice is a mirror slice and exists in a disk that is connected directly to the highest level mirror group:
disk_name.volume_name
When the slice is a mirror slice and exists in a lower level group that is connected directly to the highest level mirror group:
lower_level_group_name.volume_name
When the slice belongs to a stripe volume:
the_highest_level_stripe_group_name.volume_name
When the slice belongs to a volume created within the highest level concatenation group:
the_highest_level_concatenation_group_name.volume_name
When the slice belongs to a switch volume:
active_disk_name.volume_name
When the slice is a single slice:
single_disk_name.volume_name
You can designate each object uniquely in the entire system by the object name and the class name to which it belongs.
Note
Same Class Names
Multiple single nodes on which classes with the same name exist can be changed over to a cluster system through installation of the cluster control facility. For details, see "A.2.34 Changing Over from Single Nodes to a Cluster System."
Note
Shadow Disk Name
Name shadow disks according to the following rules:
When the shadow disk is already registered with a class in another domain and managed as an SDX disk, assign the SDX disk name in said domain.
When the shadow disk contains data copied from an SDX disk with the disk unit's copy function, assign the copy source SDX disk name.
