Compaq StorageWorks TM RAID Array 3000 Pedestal Storage Subsystem Guide de l'utilisateur Page 44
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2-10 RAID Array 3000 Pedestal Storage Subsystem Hardware User’s Guide
Compaq Confidential – Need to Know Required
Writer: Bob Young Project: RAID Array 3000 Pedestal Storage Subsystem Hardware User’s Guide Comments:
Part Number: EK-SMCPO-UG. C01 File Name: c-ch2 RAID Array Controller.doc Last Saved On: 12/4/00 1:51 PM
Efficient Write and Read Algorithms
Standard RAID write operations that involve parity, such as those in RAID
levels 4 and 5, require multiple, time-consuming steps:
1. Read data from the parity drive.
2. Read existing data from the target data drives.
3. Exclusive-or the old parity, old data, and new data to generate new
parity data.
4. Write the new parity data to the parity drive.
5. Write the new data to the target data drives.
The controller uses several techniques to streamline write operations and
significantly improve performance. All the techniques use the controller’s on-
board cache, which can contain up to 64 MB of memory in the form of
standard 72-pin, 60 ns SIMMs.
NOTE: The controller will not operate without at least one 4 MB SIMM installed in its
cache. Also, it will not operate without either a backup or a UPS connected to the
controller. Without a backup, data stored in the cache, but not yet written to the disk
drives, would be lost in the event of a power interruption.
Write-Back Caching
When the host sends data to be written to a redundancy group, the controller
stores the data in its cache and immediately reports to the host that it has
completed the write. The controller eventually writes the data to the disk
drives when the write can be done most efficiently, or when the controller
must flush the cache to make room for other data or to prepare for a shutdown.
Write-back caching makes the host more responsive to the user, since the host
does not have to wait for a lengthy RAID write before proceeding to another
task.
- Compaq StorageWorks 1
- Contents 3
- Chapter 2 4
- Chapter 3 4
- Chapter 4 5
- Chapter 5 5
- List of Figures 5
- List of Tables 7
- About This Guide 9
- Related Documents 11
- Text Conventions 12
- Symbols in Text 13
- Symbols on Equipment 13
- This is a test 14
- Rack Stability 15
- Getting Help 15
- Compaq Website 16
- Compaq Authorized Reseller 16
- Product Overview 17
- PEDESTAL 18
- Table 1-1 19
- Pedestal Features 20
- Pedestal Cabinet 20
- Product Overview 1-5 21
- Pedestal Components 22
- Pedestal Power Supplies 23
- Product Overview 1-9 25
- UltraSCSI Buses 26
- Table 1-2 29
- Table 1-3 30
- Table 1-4 31
- (Y-cable connection cabling) 31
- Rear View of DS-SWXRA-GA 32
- Controller Pedestal 32
- Rear View of 32
- DS-SWXRA-GD 32
- Expansion Pedestal 32
- Specifications 33
- Table 1-7 34
- RAID Array Controller 35
- Controller Features 37
- Table 2-1 39
- Controller Specifications 39
- Environmental 41
- Performance Enhancements 43
- Write-Back Caching 44
- Write Gathering 45
- Write On Top 45
- RAID Levels Supported 46
- Figure 2-4. RAID 0 write 48
- RAID 0+1 49
- Table 2-5 50
- RAID 0+1 Example 50
- Redundant Operation 54
- Environmental 55
- Backup Power Management 56
- Voltage Monitoring 57
- Temperature Monitoring 58
- Board Temperature 59
- Table 2-11 59
- Maintenance 61
- SBB Status LEDs 63
- Controller LEDs 64
- EMU Error Reporting 65
- Replacing Components (FRUs) 66
- Removing the Pedestal Door 67
- Replacing an SBB 67
- Figure 3-4. Replacing an SBB 68
- Replacing a Power Supply 69
- Replacing the EMU Board 71
- Replacing the UPS 73
- Reconfiguring the SCSI Bus 74
- Maintenance 3-17 77
- Maintenance 3-19 79
- Expansion Pedestal Option 81
- Expansion Pedestal Cabinet 82
- EXPANSION PEDESTAL 83
- Expansion Pedestal Components 84
- SCSI cable 17-04454-01 86
- SHR-1495 87
- Connect Jumper Cable 89
- Remove Knockout 90
- Connect SCSI Cable 91
- Pedestal 94
- Expansion 94
- Pedestal 94
- Second Controller Option 97
- Second Controller Option Kit 98
- Installing the Upgrade 99
- Updating Firmware 100
- Shutting Down the RA3000 102
- Replacing Existing Controller 104
- Restoring the Configuration 105
- Operation 108
- HSZ22 StorageWindow) 110
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