The Rebalance script for IBM SVC has been updated

I found this in the Aussie Storage Blog

http://aussiestorageblog.wordpress.com/2013/04/22/ibm-scripting-tools-for-svc-and-storwize-has-been-updated/

 

Rebalancing of managed disk groups has to be done whenever you add new mdisks to a group - otherwise the IOPS and response
times on these managed disk groups become unbalanced and you will not see the expected performance out of the group.

 

More informations about unbalanced mdisk groups here

BVQ howto - Analyze MDisk Groups.pdf

 

Click on pictures to enlarge


in this picture you can see that most of the IO is handeled by only one managed disk.
It handles three times more IO than the other mdisks. This mdg will become a
performance problem soon when this one mdisk becomes more load and saturates.

 

This is how it is lookiong like in performance view. The green lines are IOPS from the
one mdisk and another with smaller load and thge red lines are the response times.
It is obvious that response time of the high load mdisk will become an issue soon.

 

 

 

 

Let us help!


or try us out!

Bottleneck Analysis

Planning Analysis

Health Check

Consulting


Popular content:

Page: Performance bottleneck analysis on IBM SVC and IBM Storwize V7000 , Page: BVQ use cases and experiences , Page: Downloads and BVQ releases , Page: BVQ analysis VAAI: undercover write operations , Page: BVQ VMware Integration Package (video and presentation)


General links

Return on invest 

Performance analysis whitepapers


The BVQ Blog
BVQ brings complete storage monitoring, performance analysis, alerting and reporting to the IBM Storwize family.
Nice little success story!
I am very proud about these kind of success stories, where we again could help a customer to solve a performance problem in shortest time. Like this example: 2:30 pm we were informed by one of our sales colleagues, that the client has performance...
Use BVQ V3.2 for the new SVC / Storwize codelevel 7.3.x
BVQ version 3.2 supports the new SVC / Storwize code versions 7.3.x The BVQ scanner from older versions is not able to work with the new Storwize code. New BVQ code Version 3.2   If you upgrade from BVQ...
BVQ Version 3.2 is available for download
We have just released BVQ Version 3.2 Highlights: Improved 'Look and Feel' of the GUI with  customization possibilities and more space for content More possibilities for searching, sorting and filtering functions in all...
Scan mirrored SVC Storwize systems with the the updated BVQ offline scanner
Another new feature of the latest BVQ offline scanner allows to scan more than one systems at once. This is especially helpful when you plan to use BVQ Copy Services Package to analyze Metro Mirror or Global Mirror connected systems. A profile is...
BVQ Offline Scanner for Code Version 7.3.x
The BVQ offline scanner has been updated . This scanner covers now also the SVC / Storwize code version 7.3 . You can find the download and instructions for the offline scanner here . BVQ Offline Scanner  
The advantage of 1 minute measurement intervals
I have added a new document about the benefits and the limits of 1 minutes measurement intervals The advantage of 1 minute measurement intervals     
Understand performance issues in huge SVC / Storwize environments (part 2)
Use BVQ to optimize SVC and Storwize in multi IO group clusters Complete whitepaper Abstract (The whitepaper is in draft mode! ) The experience with the analysis of multi I/O group clusters always show the same kind of problem. Technical...
Understand reasons for performance issues in huge SVC environments (part 1)
I just finished an performance bottleneck analysis for an 8 nmode cluster with several 100 TB and found one thing which I think might be a commonly made mistake in many of the bigger SVC environments. This picture shows the MDisk performance of SSD storage...
an amazing analysis taken from real life
Win a SVC / Storwize analysis for free What I can give for free, when you find the correct answer to this question, is an analysis of your SVC or  Storwize. You just need to find the correct answer to the question "what kind of...
Now even less complexity but the same excellent results for SVC / Storwize performance and bottleneck analysis. The new BVQ Offline Scanner!
Read this ... ... if you haven´t planned a budget for storage analysis at the moment. ... if you just want to know what is happening in your SVC or Storwize! ... if you want to know more about the technical limits of your SVC or Storwize. ......

(.)