How to Diagnose IO Performance On A SAN

I'm runing SQL2000 with SP4 on Win 2003 Ent Srvr and use a SAN for the
database data and log files.
The SAN drives are configured as RAID5.
My question is when diagnosing IO performance issues, what perfmon counters
are recommended for use when the databases are on a SAN? I used to rely on
current disk queue length but have been told that counter is skewed when the
storage is SAN. Also if other counters are recommended, what would be the
thresholds for judging poor performance? Any utilites recommended?
thksTom,
See if this helps.
http://blogs.msdn.com/sqlcat/archive/2005/11/17/493944.aspx
AMB
"Tom Frost" wrote:
> I'm runing SQL2000 with SP4 on Win 2003 Ent Srvr and use a SAN for the
> database data and log files.
> The SAN drives are configured as RAID5.
> My question is when diagnosing IO performance issues, what perfmon counters
> are recommended for use when the databases are on a SAN? I used to rely on
> current disk queue length but have been told that counter is skewed when the
> storage is SAN. Also if other counters are recommended, what would be the
> thresholds for judging poor performance? Any utilites recommended?
> thks|||Hi Tom
"Tom Frost" wrote:
> I'm runing SQL2000 with SP4 on Win 2003 Ent Srvr and use a SAN for the
> database data and log files.
> The SAN drives are configured as RAID5.
> My question is when diagnosing IO performance issues, what perfmon counters
> are recommended for use when the databases are on a SAN? I used to rely on
> current disk queue length but have been told that counter is skewed when the
> storage is SAN. Also if other counters are recommended, what would be the
> thresholds for judging poor performance? Any utilites recommended?
> thks
Check out http://support.microsoft.com/kb/224587/
http://www.sql-server-performance.com/ew_san.asp
http://www.sql-server-performance.com/qdpma/inst_3_pmlogs.as
http://www.sql-server-performance.com/performance_monitor_counters_sql_server.asp
You SAN vendor should also have tools which you can monitor the performance,
this will be necessary to rule out interface issues i.e. the SAN is fine, but
the OS thinks it's slow!
John|||Hi,
I understand that you would like to know what performance counters should
be used to troubleshoot your SQL Server 2000 performance issue.
If I have misunderstood, please let me know.
I recommend that you refer to the following articles for monitoring your
SQL Server Performance:
TechNet Support WebCast:Performance troubleshooting and analysis in
Microsoft SQL Server 2000
http://support.microsoft.com/kb/838622
Microsoft SQL Server 2000 RDBMS Performance Tuning Guide for Data
Warehousing
http://www.microsoft.com/technet/prodtechnol/sql/2000/maintain/rdbmspft.mspx
Troubleshooting Performance Problems in SQL Server 2005
http://www.microsoft.com/technet/prodtechnol/sql/2005/tsprfprb.mspx
SQL Server 2000 I/O Basics (SQLIOStress.exe for stress test)
http://www.microsoft.com/technet/prodtechnol/sql/2000/maintain/sqlIObasics.m
spx
If you have any other questions or concerns, please feel free to let me
know.
Best regards,
Charles Wang
Microsoft Online Community Support
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======================================================|||Hi,
Just check with you to see if the suggestions were helpful. Please let us
know if you would like further assistance.
Have a great day!
Best regards,
Charles Wang
Microsoft Online Community Support
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