When you set the capacity for a , advanced preparation is required to make sure that you can complete your storage and accessibility as necessary. When you
set the capacity for a disk group, think about these business and equipment constraints:
Physical disk types – Use the most appropriate physical disk type for your capacity and accessibility requirements. Different
physical disk types have different access speeds. For example, , which is faster, and , which is slower. If fast data access is necessary for an application that manages multimedia, you must use a physical disk
type, such as SAS, that can handle fast access. If fast data access is not necessary when you back up data to your storage
array, you can use a slower physical disk type, such as SATA. The type and capacity of the physical disks that you use impact
the amount of capacity that is available for your disk group.
Data organization – Create disk groups that can organize your data. For example, you can create a single disk group to use
only by the Accounting Department. In this example, you must make sure that the disk group has enough capacity for the entire
Accounting Department. It is also possible to implement two distinct disk groups—one for the Accounts Payable staff and another
one for the Accounts Receivable staff.
System limitations – Create disk groups that are appropriate for the limitations of your system storage capacity. For example,
if your system’s capacity limit for virtual disks is 2 TB, and your disk group is 36 TB, you must create 18 virtual disks
to use all of the in the disk group.
RAID level – Use the appropriate level for your data redundancy requirements. When you make a disk group, the RAID level you set applies to the entire disk
group and all associated virtual disks. Make sure that the RAID level you set for a disk group is compatible for all the data
within that disk group.