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IRIX 6.5 » Books » Administrative »
Origin FibreVault and Fibre Channel RAID Administrator's Guide
(document number: 007-3715-002 / published: 1998-12-23)
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Appendix C. Cache and Cache Page Size This appendix contains information on read cache and write cache size, cache page size, and storage processor revision level.
The amount of write cache you can allocate depends on the SP revision level. To determine the revision level of an SP, open the door of the storage system and observe the label on the SP panel; see Figure C-1.
Another way to determine SP revision level is to enter
scsicontrol -I devicename
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In the output, look for the numerals 00 or 01 at the right, as pointed out in Figure C-2.
In this output, 00 corresponds to 9470198 and 01 corresponds to 9470284 (formerly 9470207).
Table C-1 and Table C-2 show the relationships between cache page size and cache configuration for each revision level of SP.
Table C-1. Cache Capability for SP 9470198
Cache Page Size
| User-Configurable
Write Cache
| User-Configurable
Read Cache
| Cache Configuration
|
|---|
2 KB
| 14 MB
0
7 MB
| 0
21 MB
7 MB
| 100% write cache
100% read cache
50% write/50% read
| 4 KB
| 28 MB
0
14 MB
| 0
43 MB
14 MB
| 100% write cache
100% read cache
50% write/50% read
| 8 KB
| 56 MB
0
28 MB
| 0
86 MB
28 MB
| 100% write cache
100% read cache
50% write/50% read
| 16 KB
| 113 MB
0
56 MB
| 0
120 MB
56 MB
| 100% write cache
100% read cache
50% write/50% read
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Table C-2. Cache Capability for SP 9470284
Cache Page Size
| User-Configurable
Write Cache
| User-Configurable
Read Cache
| Cache Configuration
|
|---|
2 KB
| 194 MB
0
106 MB
| 0
248 MB
106 MB
| 100% write cache
100% read cache
50% write/50% read
| 4 KB
| 388 MB
0
213 MB
| 0
497 MB
213 MB
| 100% write cache
100% read cache
50% write/50% read
| 8 KB
| 504 MB
0
426 MB
| 0
504 MB
426 MB
| 100% write cache
100% read cache
50% write/50% read
| 16 KB
| 504 MB
0
504 MB
| 0
504 MB
504 MB
| 100% write cache
100% read cache
50% write/50% read
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Origin FibreVault and Fibre Channel RAID Administrator's Guide
(document number: 007-3715-002 / published: 1998-12-23)
table of contents | additional info | download
Front Matter
About This Guide
Chapter 1. Fibre Channel RAID Graphical User Interface Features
Chapter 2. Using the RAID GUI to Configure Arrays
Chapter 3. Reconfiguring and Fine-Tuning
Chapter 4. Monitoring Arrays and Displaying System Statistics
Chapter 5. Identifying and Correcting Failures
Chapter 6. The Fibre Channel RAID Command-Line Interface
Chapter 7. The Fibre Channel Non-RAID Command-Line Interface
Appendix A. Error Recovery
Appendix B. Server Serial Connector Pinouts
Appendix C. Cache and Cache Page Size
Index
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