Dell PowerVault MD3000i Handmatig afstemmen - Pagina 3
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Dell™ PowerVault MD3000 and MD3000i Array Tuning Best Practices
Table of Contents
1
AUDIENCE AND SCOPE .............................................................................................................................. 4
2
PERFORMANCE TUNING OVERVIEW .......................................................................................................... 4
2.1
2.2
3
APPLICATION SOFTWARE CONSIDERATIONS.............................................................................................. 5
4
CONFIGURING THE MD3000/MD3000I ...................................................................................................... 6
4.1
4.1.1
Selecting a RAID Level - High Write Mix Scenario ..................................................................................8
4.1.2
Selecting a RAID Level - Low Write Mix Scenario...................................................................................8
4.2
4.3
V
4.4
V
4.5
4.6
................................................................................................................................................12
4.6.1
Setting the Virtual Disk-Specific Write Cache and Write Cache Mirroring...........................................12
4.6.2
Setting the Virtual Disk-Specific Read Cache Pre-fetch........................................................................12
4.6.3
Setting the Storage Array Cache Block Size .........................................................................................13
4.7
4.7.1
Collecting Performance Statistics ........................................................................................................14
4.7.2
RAID Level ............................................................................................................................................14
4.7.3
I/O Distribution ....................................................................................................................................15
4.7.4
Stripe Size.............................................................................................................................................16
4.7.5
Write Algorithm Data ..........................................................................................................................19
4.8
4.9
4.9.1
Global Media Scan Rate.......................................................................................................................22
4.9.2
Setting the Virtual Disk-Specific Media Scan .......................................................................................22
4.10
4.10.1
Getting Optimal Performance from Snapshot.................................................................................22
4.10.2
Getting Optimal Performance from Virtual Disk Copy ....................................................................22
5
CONSIDERING THE HOST SERVER(S)..........................................................................................................23
5.1
5.1.1
Considering the Server Hardware Architecture....................................................................................23
5.1.2
Sharing Bandwidth on the Dell™ MD3000i with Multiple NICs ...........................................................23
5.1.3
Sharing Bandwidth with Multiple SAS HBAs ........................................................................................24
5.2
5.2.1
Buffering the I/O ..................................................................................................................................25
5.2.2
Aligning Host I/O with RAID Striping....................................................................................................25
APPENDIX A: OBTAINING ADDITIONAL PERFORMANCE TOOLS ..........................................................................27
APPENDIX B: SYSTEM TROUBLESHOOTING .......................................................................................................28
APPENDIX C: REFERENCES ................................................................................................................................29
APPENDIX D: GLOSSARY OF TERMS ...................................................................................................................30
December 2008 - Revision A01
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