HP 3PAR StoreServ 7200 2-node HP 3PAR StoreServ Storage Concepts Guide (OS 3.1 - Page 38

Logical Disk Size and RAID Types, Data Striped Across RAID MP Sets on a RAID MP Logical Disk

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Figure 6 Data Striped Across RAID MP Sets on a RAID MP Logical Disk Logical Disk Size and RAID Types A logical disk is a collection of physical disk chunklets arranged as rows of RAID sets. 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 logical disk size is divisible by the size of one chunklet, either 1 GB or 256 KB. The total size of the logical disk is determined by the number of data chunklets in the RAID set. • A RAID 0 or RAID 1 logical disk 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 8 chunklets. RAID MP set sizes of 8 and 16 chunklets are supported. The system default is 8 chunklets. A RAID MP set with 8 chunklets has a total of 6 chunklets of space for data and 2 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 KB. 38 Logical Disks

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Figure 6 Data Striped Across RAID MP Sets on a RAID MP Logical Disk
Logical Disk Size and RAID Types
A logical disk is a collection of physical disk chunklets arranged as rows of RAID sets. 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 logical disk size is divisible by the size of
one chunklet, either 1 GB or 256 KB. The total size of the logical disk is determined by the number
of data chunklets in the RAID set.
•
A RAID 0 or RAID 1 logical disk 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 8 chunklets. RAID MP set
sizes of 8 and 16 chunklets are supported. The system default is 8 chunklets. A RAID MP set
with 8 chunklets has a total of 6 chunklets of space for data and 2 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 KB.
38
Logical Disks