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тАО02-05-2009 07:28 AM
тАО02-05-2009 07:28 AM
Has anyone seen this?
I've run sanity checks against Oracle data Luns, etc. and I do NOT see similar behavior.
Further, the log luns are NOT experiencing similar copy-on-write growth.
What gives with Exchange 2007?
I did have the exchange administrator disable database maintenance last night (since I thought maybe that was it... but no, still seeing the symptoms.)
Here is an example SSSU command demonstrating how I am obtaining the snap.
ADD SNAPSHOT snap-c1_emarqstaclus_lun021 VDISK="\Virtual Disks\windows\emarqstaclus\STA1-SG1-DATA\c1_emarqstaclus_lun021" ALLOCATION_POLICY="Demand" REDUNDANCY="Vraid0"
This thread is NOT to discuss application queisce, etc., but rather to understand why I am seeing so much copy-on-write with EVA demand allocated snapshots and exchange 2007.
I have:
EVA 8.1K XCS 6.2
Windows 2003 SP2, Exchange 2007 SP 1
Any ideas welcome about why so many dirty blocks. I've run out of ideas.
Solved! Go to Solution.
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тАО02-05-2009 11:48 AM
тАО02-05-2009 11:48 AM
Re: Demand Allocated Snapshot Growth (EVA) and Exchange 2007 DATA luns
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тАО02-05-2009 10:55 PM
тАО02-05-2009 10:55 PM
SolutionI, too, guess that some activity is making massive changes to the database. Maybe the Exchange administrator did not disable all maintenance tasks, or something external is causing this.
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тАО02-06-2009 05:32 AM
тАО02-06-2009 05:32 AM
Re: Demand Allocated Snapshot Growth (EVA) and Exchange 2007 DATA luns
Yes, I've asked the exchange admin to look also and stressed I would probably get no where since this has to be on host (based on my tests and fact that log luns don't show similar activity).
I googled yesterday for hours, but I found nothing but meantions of "database maintenance". I am pretty confident that those were indeed not running for my tests.
Other: We don't use checksum scanning, nor page zeroing. Only interesting feature that I know is enabled is "online compaction"
So... I was hoping another SAN guy had hit this before since exchange is such a popular app. Sounds like I am alone here though or maybe one of few who wants to do demand allocated snapshot.
I am not familiar with MS knowledge base, but am eager to try out some searches and see if I hit something. I'll give it a try.
I'll let this question ferment a little then swing around with points.
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тАО06-04-2009 06:30 AM
тАО06-04-2009 06:30 AM
Re: Demand Allocated Snapshot Growth (EVA) and Exchange 2007 DATA luns
Was more information ever found for this issue?
I see the same type snap growth for a large medical database on a 8000/6.2
Thanks.
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тАО06-04-2009 06:36 AM
тАО06-04-2009 06:36 AM
Re: Demand Allocated Snapshot Growth (EVA) and Exchange 2007 DATA luns
I was able to get money to buy enough disk to make this work and we are already moving to next version of exchange were we will use DAG groups to get the copies at the app level.
For my situation, I think the problem was a form of online defragmentation of the b+ trees, but I never got anyone to confirm it that knows how the code works.
I am confident it was something the app was doing and not an EVA problem. I proved this to myself by snapping oracle db's and not seeing similar issues.
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тАО06-04-2009 06:39 AM
тАО06-04-2009 06:39 AM
Re: Demand Allocated Snapshot Growth (EVA) and Exchange 2007 DATA luns
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тАО06-04-2009 06:44 AM
тАО06-04-2009 06:44 AM
Re: Demand Allocated Snapshot Growth (EVA) and Exchange 2007 DATA luns
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тАО06-04-2009 06:49 AM
тАО06-04-2009 06:49 AM
Re: Demand Allocated Snapshot Growth (EVA) and Exchange 2007 DATA luns
It is certainly true if there is any defrag of filesystem or DB itself that you can see churning that makes blocks look dirty to EVA.
Anyhow, good luck to you.