Hi all,
We deployed several small MSA configurations (for a dedicated critical application) for a customer: Two disk groups (4 x SSDs) are used , one per pool. Firmware vesion is VL270P003-01.
Looking the performance at different levels (from pool to disk), we observed peak of IOs (not linked to the application) and impressive Queue Depth (the graph showed a curve about 8 000 000!!!).
We decided to disable the backgroup disk-groups and disk jobs scrub and to reset all statistics (because disk no more belonging to a disk group was reporting with I/Os).
Now I/Os at disk level seems normal (no more peak at 2000/3000 IOs due to scrub job) but the QueueDepth is curious : for some disks, we have about 100 (for me it is high regarding application activity and usage of SSD) and for other we continue to have 8000000. Confidence with performance reporting is low.
With CLI, it is not possible to have live QueueDepth while with SMU a QueueDepth is reporting (in live performance area) and the number shows seems correct (<3 and often = 0).
Do you experiment same issues with QueueDepth reports?
Regards,
Max