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Yak Posting Veteran

84 Posts

Posted - 12/11/2012 :  10:45:50  Show Profile  Reply with Quote

We run the databases on new SAN environment.
The database in question is used for data processing (ETL). It is taking abnormally long and I am trying to investigate.

I see the following behavior:

For this DB, the data and logs live on the same drive and when I check read/write, Data has 76 ms delay and log file has 3 ms delay.

Looking the tempDB on the same server - I can see that the delay is more on Data then Logs file.
Could this be that, the problem is with the application, not on the SAN or Disks.

If I am going about this in the wrong directions, I would appreciate some pointers on where to look at.


Flowing Fount of Yak Knowledge

United Kingdom
2179 Posts

Posted - 12/12/2012 :  01:54:19  Show Profile  Visit jackv's Homepage  Reply with Quote
1) When it was running fast - was it on the same server \ doisk layout? In other words, has it suddenly gone slow?
2) Without know the underlying details of your SAN configuration - is there any particular reason why data and log drives are on the same drive. ? Consider splitting onto separate drives - with separate IO channels
3) What maintenance are you applying?
4)Is SAN replication turned on?

Jack Vamvas
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