HP LC2000r HP NetRAID 1M/2M Installation & Configuration - Page 170

Physical Arrays and Hot Spares, Logical Drives

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Appendix C Worksheets Figures C-3 and C-4 are samples of Worksheets A and B for an HP NetRAID adapter with ten physical drives, three arrays, and three logical drives. It is adapter #0 in PCI Slot #5 in the HP Netserver, and it has a 50% rebuild rate. Physical Arrays and Hot Spares • Array 0 on Channel 0 contains three 9-GB physical drives (SCSI ID # 1, 2, 3). • Array 1 on Channel 1 contains two 4-GB physical drives (SCSI ID # 0 and 1). • Array 2 on Channel 1 contains three 9-GB physical drives (SCSI ID # 3, 8, 9). • A dedicated hot spare is reserved for Array 1 only. The physical drive has SCSI ID #2 on Channel 1. • A global hot spare is available in case a drive fails in any array. The physical drive has SCSI ID #4 on Channel 0. The 9-GB capacity of the global hot spare is greater than or equal to the physical capacity of the individual physical drives in all three arrays. Logical Drives • Logical Drive 0 is on Array 0 and does not span another array. It uses RAID level 5 with a capacity of 18 GB. (The capacity of one physical drive is used for parity.) Logical Drive 0 has a stripe size of 64 KB. Its write policy is Write Back, its read policy is Adaptive Read Ahead, and its cache policy is Cached. • Logical Drive 1 is on Array 1 and does not span another array. It uses RAID level 1 with a capacity of 4 GB. (Mirroring uses up half the physical capacity.) Logical Drive 1 has a stripe size of 16 KB. Its write policy is Write Back, its read policy is Adaptive Read Ahead, and its cache policy is Cached. • Logical Drive 2 is on Array 2 and does not span another array. It uses RAID level 5 with a capacity of 10 GB. Logical Drive 2 has a stripe size of 64 KB. Its write policy is Write Back, its read policy is Adaptive Read Ahead, and its cache policy is Cached. • Logical Drive 3 is on Array 2 and does not span another array. It uses RAID level 5 with a capacity of 8 GB. Logical Drive 3 has a stripe size of 64 KB. Its write policy is Write Back, its read policy is Adaptive Read Ahead, and its cache policy is Cached. The equivalent of one physical drive holds the parity information for Logical Drives 2 and 3. 162

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Appendix C
Worksheets
162
Figures C-3 and C-4 are samples of Worksheets A and B for an HP NetRAID
adapter with ten physical drives, three arrays, and three logical drives. It is
adapter #0 in PCI Slot #5 in the HP Netserver, and it has a 50% rebuild rate.
Physical Arrays and Hot Spares
•
Array 0
on Channel 0 contains three 9-GB physical drives (SCSI ID # 1,
2, 3).
•
Array 1
on Channel 1 contains two 4-GB physical drives (SCSI ID # 0
and 1).
•
Array 2
on Channel 1 contains three 9-GB physical drives (SCSI ID # 3,
8, 9).
•
A dedicated hot spare
is reserved for Array 1 only. The physical drive
has SCSI ID #2 on Channel 1.
•
A
global hot spare
is available in case a drive fails in any array. The
physical drive has SCSI ID #4 on Channel 0. The 9-GB capacity of the
global hot spare is greater than or equal to the physical capacity of the
individual physical drives in all three arrays.
Logical Drives
•
Logical Drive 0
is on Array 0 and does not span another array. It uses
RAID level 5 with a capacity of 18 GB. (The capacity of one physical
drive is used for parity.) Logical Drive 0 has a stripe size of 64 KB. Its
write policy is Write Back, its read policy is Adaptive Read Ahead, and its
cache policy is Cached.
•
Logical Drive 1
is on Array 1 and does not span another array. It uses
RAID level 1 with a capacity of 4 GB. (Mirroring uses up half the
physical capacity.) Logical Drive 1 has a stripe size of 16 KB. Its write
policy is Write Back, its read policy is Adaptive Read Ahead, and its
cache policy is Cached.
•
Logical Drive 2
is on Array 2 and does not span another array. It uses
RAID level 5 with a capacity of 10 GB. Logical Drive 2 has a stripe size
of 64 KB. Its write policy is Write Back, its read policy is Adaptive Read
Ahead, and its cache policy is Cached.
•
Logical Drive 3
is on Array 2 and does not span another array. It uses
RAID level 5 with a capacity of 8 GB. Logical Drive 3 has a stripe size of
64 KB. Its write policy is Write Back, its read policy is Adaptive Read
Ahead, and its cache policy is Cached. The equivalent of one physical
drive holds the parity information for Logical Drives 2 and 3.