Inspur AS500H, User Manual, Page: 51 / 56

driver type will have a correlated unconfigured capacity. Drivers of different types could not be
mixed in the same volume group.
20.3 Volume group, DDP and volume creating notes
1. Each volume group or DDP could create one or more volumes, in order to handle different
data requirements or for maximum capacity limit on single volume, each volume group or DDP
could create more than one volume.
2. Supported RAID levels are 0, 1, 3, 5, 6 and 10.
Raid 0 does not provide data redundancy;
Raid10 is not an independent raid level, which is only supported while creating a raid1
volume group composed of four or more drivers.
Raid1 could only be configured when there’s an even number of disks in volume group.
Raid3 or raid5 could only be configured when there’re 3 or more disks in volume group.
Raid6 could only be configured when there’re 5 or more disks in volume group.
3. DDP needs at least 11 disks, more disks could bring along better performance, and faster
recovery speed after disk failure.
20.4
Host to volume mapping and storage partition notes
1. A logical address is required while creating each volume mapping, which is called logical
unit number (LUN), and the host uses this address to access data on volume.
2. When create a volume manually, there’re two mappings for selection;
Default mapping – If no storage partition is to be used, please select this option. Software
will specify an LUN for this volume, and hosts in system default partitions will share these
volumes.
Post-map – If a storage partition is to be used, please select this option. Please provide the
following information according to wizard:
Specify host groups and hosts;
Specify expected host groups or volumes to be accessed by hosts;
Allocate LUN number for each accessing volume;
20.5
Hot spare disk usage notes
1. Hot spare disk is redundancy of another level added by storage arrays, and it is suggested
to create at least one hot spare disk for each storage volume group.
2. Hot spare disk does not provide protection for RAID 0 volume group, for data on this
volume group has no redundancy.
3. Hot spare disk is not used for specific volume group, but for the globe, which means it will
be used in any fault driver in storage arrays, and fault drivers shall have the same driver type and
capacity with hot spare disk (equal to or less than).