HP ProLiant DL380G5-WSS 3.7.0 HP StorageWorks HP Scalable NAS File Serving Sof - Page 104

second subdevice, and then to the third subdevice. This method fills the subdevices at the same rate and may provide better performance. • Concatenation. When a dynamic volume is created without striping, data is written to the first subdevice until it is full. Then data is written to the second subdevice, and so on. Dynamic volume names The Cluster Volume Manager uses unique device names to control access to dynamic volumes. These names form the pathnames that servers use to access shared data. When you create a dynamic volume, the Cluster Volume Manager gives it a global device name. The name consists of psv followed by an integer. For example, psv1, psv2, and psv25 are all valid names. HP Scalable NAS stores information about dynamic volumes in a volume database located on the membership partitions. Volume signature When a dynamic volume is created, a volume signature is written on each subdevice in the volume. The signature specifies the volume to which the subdevice belongs. When a dynamic volume is deported, the subdevices making up the volume will retain their volume signatures, allowing the volume to be reassembled when it is imported again. Configuration limits The configuration limits for dynamic volumes are as follows: • A maximum size of 128 TB for a dynamic volume. • A maximum of 512 dynamic volumes per cluster. • A maximum of 128 subdevices per dynamic volume. • Concatenated dynamic volumes can be extended up to 128 times; however, the total number of subdevices cannot exceed 128. • Striped dynamic volumes can be extended up to 16 times; however, the total number of subdevices cannot exceed 128. 104 Configure dynamic volumes