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2-10 RAID Array 3000 Controller Shelf Hardware User’s Guide
Compaq Confidential – Need to Know Required
Writer: Bob Young Project: RAID Array 3000 Controller Shelf Hardware User’s Guide Comments:
Part Number: EK-SMCPQ-UG. D01 File Name: c-ch2 RAID Array 3000 Controller.doc Last Saved On: 12/4/00 1:08 PM
RAID 0
RAID 0 breaks up data into smaller chunks and writes each chunk to a
different drive in the array. The size of each chunk is determined by the
controller’s chunk size parameter, which you set in the course of creating a
RAID set.
The advantage of RAID 0 is its high bandwidth. By breaking up a large block
of data into smaller chunks, the controller can use multiple drive channels to
write the chunks to the disk drives. Furthermore, RAID 0 involves no parity
calculations to complicate the write operation. Likewise, a RAID 0 read
operation employs multiple drives to assemble a single, large data block. This
makes RAID 0 ideal for applications such as graphics, video, and imaging that
involve the writing and reading of large, sequential blocks. Figure 2– 5 shows a
diagram of a RAID 0 write.
CAUTION: The lack of parity means that a RAID 0-disk array offers no
redundancy and thus cannot recover from a drive failure.
1011
0110
1010
0101
0000
0001
1100
1111
0111
1010
Host Data Controller divides the
data into chunksized units
There is still data left
so the Controller
repeats the process
1011
0001
0110
1100
1010
1111
0101
0111
0000
1010
Striped data
written to the array
Striped data
written to the array
S
H
R
-1
0
5
4
Figure 2-5. RAID 0 write
- Compaq StorageWorks 1
- Contents 3
- Chapter 2 4
- Chapter 3 4
- Chapter 4 5
- List of Figures 5
- List of Tables 7
- About This Guide 9
- Related Documents 11
- Text Conventions 12
- Symbols in Text 12
- Symbols on Equipment 13
- Rack Stability 14
- Getting Help 14
- Compaq Website 15
- Compaq Authorized Reseller 15
- Product Overview 17
- Table 1-1 20
- Product Overview 1-5 21
- Controller Shelf Features 22
- Controller Shelf Enclosure 22
- SHR-1051b 23
- Shelf Cabinet 24
- Device I/O Module 25
- Host I/O Module 28
- Shelf Cooling 29
- Figure 1-8. Power supply 30
- Table 1-2 33
- Table 1-3 34
- Table 1-4 35
- Table 1-5 36
- Specifications 37
- Table 1-6 38
- Product Overview 1-23 39
- Table 1-7 40
- Product Overview 1-25 41
- RAID Array 3000 Controller 43
- Controller Features 45
- Table 2-1 47
- LED/Reset Switch Interface 47
- Reset H0 D0H1 D1 Fault 48
- Custom Components 49
- Write-Back Caching 50
- Write Gathering 50
- Write On Top 50
- RAID Levels Supported 51
- Figure 2-5. RAID 0 write 52
- RAID 0+1 54
- Table 2-4 55
- RAID 0+1 Example 55
- Redundant Operation 59
- Initialization 60
- Message Passing 60
- Failover 60
- Environmental 61
- Installation and Maintenance 63
- Metric cabinet 69
- Installation 69
- UPS installation into a 69
- RETMA or metric 69
- (Round Hole) 70
- Table 3-2 70
- (Square Hole) 71
- Installing UPS Brackets 72
- Table 3-3 73
- Procedures 75
- Subsystem 77
- DEVICE EXPANSION SHELF # 1 78
- CONTROLLER SHELF 78
- DEVICE EXPANSION SHELF #1 79
- DEVICE EXPANSION SHELF # 2 81
- DEVICE EXPANSION SHELF # 3 83
- DEVICE EXPANSION SHELF # 4 85
- Controller Shelf Status LED’s 86
- Controller Status LEDs 87
- Table 3-4 89
- Replacing a Power Supply SBB 91
- Replacing the RAID Controller 92
- Replacing the UPS 93
- Replacing a Blower 93
- Second Controller Option 99
- Installing the Upgrade 100
- Updating Firmware 102
- Shutting down the RA3000 104
- Replace Existing Controller 106
- Restoring the Configuration 107
- Operation 109
- HSZ22 Storage window 111
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