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(FC) Poor performance due to misalignment of partitioned LUNs

If you experience poor performance on some or all FC LUNs that have partitions, it might be due to an alignment mismatch between the LUN block boundaries and the underlying WAFL boundaries.

This problem occurs only with partitions and only with certain combinations of disk geometry parameters.

You can resolve the issue by using the fdisk command to manually enter the disk geometry parameters when creating partitions. For specific steps, see bug number 156121 on Bugs Online, which is available on the NetApp Support Site..