HP 3PAR StoreServ Concepts Guide: HP 3PAR OS 3.1.3
Figure 8 Data Striped Across RAID MP Sets on a RAID MP LD
LD Size and RAID Types
On F-Class and T-Class systems all chunklets are 256 MB. On StoreServ 10000 and StoreServ
7000 systems all chunklets are 1 GB. All systems round up so that the LD size is divisible by the
size of one chunklet, either 1 GB or 256 MB. The total size of the LD is determined by the number
of data chunklets in the RAID set.
• A RAID 0 or RAID 1 LD must contain at least one chunklet.
• A RAID 5 set, or parity set, must contain at least three chunklets. A RAID 5 set with three
chunklets has a total of two chunklets of space for data and one chunklet of space for parity.
The system default is four chunklets: three for data and one for parity (3+1).
• A RAID MP set (RAID 6), or double-parity set, must contain at least eight chunklets. RAID MP
set sizes of eight and 16 chunklets are supported. The system default is eight chunklets. A
RAID MP set with eight chunklets has a total of six chunklets of space for data and two chunklets
of space for parity (6+2). On StoreServ 10000 and StoreServ 7000 systems, RAID 6 set sizes
of (4+2), (6+2), (8+2), (10+2), and (14+2) are supported.
NOTE: The system also rounds up the size of virtual volumes, CPGs, and CPG growth increments
to be divisible by the size of one chunklet, either 1 GB or 256 MB.
40 LDs