Aggravating circumstances for the Back-to-Back scenario
Applies to
- ONTAP 9
- Data ONTAP 8
- Data ONTAP 7
Answer
- The incoming workload (continuous or burst) is greater than what the storage appliance is configured to handle (commonly this includes using slower drives for production loads).
- Inefficiencies in data layout cause excessive internal systems overhead(usually due to unaligned IO in LUNs or VMDK storage objects).
- If either of the above circumstances exists, they absolutely must be corrected in an effort to alleviate future performance issues with the storage controller.
- If the issue is due to unaligned IO on LUNs or VMDK storage objects, this should be the initial focus for addressing the possible performance issues.
Note:
- Back-to-Back CPs are identified by a
'B'
or'b'
in the CP Type column ofsysstat
output, not simply seeing CPs start in the next sample after one completes. - If you are experiencing a performance problem with workload, throughput or latency, then please open a case with NetApp Global Support.
Additional Information
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