HP LH4r Installation and configuration of the HP NetRAID, NetRAID-1 and NetRAI - Page 154

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 4066-MB physical drives (SCSI ID # 1, 2, 3). • Array 1 on Channel 1 contains two 8677-MB physical drives (SCSI ID # 0 and 1). • Array 2 on Channel 2 contains three 2032-MB physical drives (SCSI ID # 4, 5, and 6). • 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. Since a dedicated hot spare is assigned for Array 1, the global hot spare would only be used by Array 0 or Array 2. The 4066-MB capacity of the global hot spare is greater than or equal to the physical capacity of the individual physical drives in those two 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 8132 MB. (The capacity of one physical drive is used for parity.) Logical Drive 0 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 Direct. • Logical Drive 1 is on Array 1 and does not span another array. It uses RAID level 1 with a capacity of 8677 MB. (Mirroring uses up half the physical capacity.) Logical Drive 0 has a stripe size of 8 KB. Its write policy is Write Back, its read policy is Adaptive Read Ahead, and its cache policy is Direct. • Logical Drive 2 is on Array 2 and does not span another array. It uses RAID level 5 with a capacity of 4062 MB. (The capacity of one physical drive is used for parity.) Logical Drive 2 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 Direct. 146

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Appendix C
Worksheets
146
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 4066-MB physical drives (SCSI ID
# 1, 2, 3).
•
Array 1
on Channel 1 contains two 8677-MB physical drives (SCSI ID #
0 and 1).
•
Array 2
on Channel 2 contains three 2032-MB physical drives (SCSI ID
# 4, 5, and 6).
•
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. Since a dedicated hot spare
is assigned for Array 1, the global hot spare would only be used by
Array 0 or Array 2. The
4066-MB capacity of the global hot spare is
greater than or equal to the physical capacity of the individual physical
drives in those two 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 8132 MB. (The capacity of one physical
drive is used for parity.) Logical Drive 0 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 Direct.
•
Logical Drive 1
is on Array 1 and does not span another array. It uses
RAID level 1 with a capacity of 8677 MB. (Mirroring uses up half the
physical capacity.) Logical Drive 0 has a stripe size of 8 KB. Its write
policy is Write Back, its read policy is Adaptive Read Ahead, and its
cache policy is Direct.
•
Logical Drive 2
is on Array 2 and does not span another array. It uses
RAID level 5 with a capacity of 4062 MB. (The capacity of one physical
drive is used for parity.) Logical Drive 2 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 Direct.