Hp StorageWorks 3000 RAID Array Bedienungsanleitung Seite 57
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RAID Array 3000 Controller 2-15
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
In the event of a single drive failure, a RAID 4 array will continue to operate
in degraded mode. If the failed drive is a data drive, writes will continue as
normal, except no data will be written to the failed drive. Reads will
reconstruct the data on the failed drive by performing an exclusive-or
operation on the remaining data in the stripe and the parity for that stripe. If
the failed drive is a parity drive, writes will occur as normal except no parity
will be written. Reads will simply retrieve data from the data disks. There will
be no deterioration in controller performance while a RAID set is in degraded
mode.
In general, RAID 4 is best suited for applications such as graphics, imaging, or
video that call for reading and writing large, sequential blocks of data.
However, you may find that RAID 4 is preferable to RAID 5 even for
applications characterized by many small I/O operations, such as transaction
processing. This is due to the controller’s intelligent caching, which efficiently
handles small I/O reads and writes, and to the relatively less complex
algorithms needed to implement RAID 4.
The benefits of RAID 4 disappear when you have many, small I/O operations
scattered randomly and widely across the disks in the array. RAID 4’s fixed
parity disk becomes a bottleneck in such applications, as the following
example illustrates. Let’s say the host instructs the controller to make two
small writes. The writes are widely scattered, involving two different stripes
and different disk drives. Ideally, you would like both writes to take place at
the same time, but RAID 4 makes this impossible, since the writes must take
turns accessing the fixed parity drive. For this reason, RAID 5 is the better
choice for widely scattered, small write operations.
CAUTION: RAID 4 can withstand a single failure and handle I/O activity without
interruption in degraded mode until the failed drive is rebuilt. If a second drive
fails while the RAID set is in degraded mode, the entire RAID set will fail.
- 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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