HP 3PAR StoreServ 7450 4-node HP 3PAR StoreServ Storage Concepts Guide (OS 3.1 - Page 36

RAID 5 and 50, Data Striped Across RAID 1 Sets on a RAID 10 Logical Disk

Get HP 3PAR StoreServ 7450 4-node PDF manuals and user guides View all HP 3PAR StoreServ 7450 4-node manuals
Add to My Manuals
Save this manual to your list of manuals

Page 36 highlights

Figure 4 Data Striped Across RAID 1 Sets on a RAID 10 Logical Disk RAID 5 and 50 On a RAID 50 logical disk, data is striped across rows of RAID 5 sets. 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. RAID 5 set sizes with between 3 and 9 chunklets are supported. The data and parity steps are striped across each chunklet in the set. The chunklets in each RAID 5 set are distributed across different physical disks, which may be located in different drive magazines or even different drive cages. The number of sets in a row is the row size. The system accesses the data from a RAID 50 logical disk in step sizes. The step size is the number of contiguous bytes that the system accesses before moving on to the next chunklet. A RAID 5 set can function with the loss of any one of the chunklets in the set. Figure 5 (page 37) shows a RAID 50 logical disk with a set size of 3, and 2 sets in 1 row: 36 Logical Disks

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
Figure 4 Data Striped Across RAID 1 Sets on a RAID 10 Logical Disk
RAID 5 and 50
On a RAID 50 logical disk, data is striped across rows of RAID 5 sets. 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. RAID 5 set sizes with between 3 and 9
chunklets are supported. The data and parity steps are striped across each chunklet in the set. The
chunklets in each RAID 5 set are distributed across different physical disks, which may be located
in different drive magazines or even different drive cages. The number of sets in a row is the
row
size
. The system accesses the data from a RAID 50 logical disk in
step sizes
. The step size is the
number of contiguous bytes that the system accesses before moving on to the next chunklet. A RAID
5 set can function with the loss of any one of the chunklets in the set.
Figure 5 (page 37)
shows a RAID 50 logical disk with a set size of 3, and 2 sets in 1 row:
36
Logical Disks