it's so easy ! We have already carried out the first analysis, in which we have used the BVQ offline scanner.
A big advantage was :
No need to install anything!
The process is so simple:
1 The offline scanner is downloaded from our website
2 The offline scanner is started and collects performance data
3 The collected performance data will then be sent to us and analyzed
In this way, we have solved various typical error situations for our customers.
* Nonprefered Path accesses that have led to a high internal stress .
* High backend load because volume cache was accidentally switched off for central volumes
* SAN problems through buffer credit wait or high peak loads on individual ports
* or simple performance problems because the storage technology was just not able to meet the requirements
A rich variety of performance bottleneck situations with which we were able to further expand our knowledge and experience!
A simple example of an overloaded managed disk group problem:
A calculation by BVQ comes to a maximum performance capability of 1300 IOPS for this measured storage pool. (red line in second picture)
The red line shows this 1300 IOPS limit.
The 2 red bares are marking the first 2 occurrences when this red line was crossed.
Please note in the lower picture, that the storage latency (red curve) increases, when the IOPS (green curve) crosses the red line.
Please also note in the upper picture, that the same is then happening to the volumes
When the red line is crossed, the latency of the MDisks (7.7ms up to 30ms) and the latency of the volumes (upper picture) are increasing from 2ms up to 12 ms.
This effect is not visible in the caches, which proves that we are dealing with too slow storage here