We started an analysis on customer side because of pending decisions how to extend the available capacities.
these are the results after the first look (1h) - the most interesting thing here is that the system is not looking to bad on the SCSI level - but when one looks deeper ...
The Customer has performance issues since a longer time and there is a need to clarify the root causes before spending money.
There are several ideas starting from newer Nodes (it is a 2145-8G4 node) or higher performance storage classes
The result might be - get rid of the old N6060 storage with the performance issues as planned and invest in medium performance capacities
because there is no real need for highest performance classes.
The Cache on the 2145-8G4 nodes is small - we have to go deeper to find whether it is a technical need to invest in newer SVC nodes.
|Customer Session on 4. April 2003||Click on pictures to enlarge|
The IO Heat Analysis Overlay in the Treemap shows
This shows - that enough performance capability is
In Praxis - if the systems in the storage backend cannot
The result is then, that the performance of storage
Something is speeding down the performance like
The coloring is based on calculations we did for the Arrays.
The CPU Load and RW Cache is in a normal range.
This is one of the managed disk groups from
The Max Write Cache fullness is nearly always
It looks like the SVC cannot get rid of the cache
The SAN does not show any problems.
Another Sign of congestion is that the response time
More IOPS lead automatically to a higher response time.