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(iSCSI) Poor performance due to misalignment of partitioned LUNs

If you experience poor performance on some or all LUNs that have partitions, the alignment between the LUN block boundaries and the underlying WAFL boundaries might not match. Manually enter the disk geometry parameters when creating partitions with the fdisk command.

This problem occurs only with partitions and certain combinations of disk geometry parameters. For more details, see bug number 156121 on Bugs Online, which is available on the NetApp Support Site.

Modify the filter in the /etc/lvm/lvm.conf file to scan only the multipath device and not the SCSI device underneath: filter = [ "r|/dev/sd*|", "r|/dev/disk/.*|", "r|/dev/block/.*|", "a/.*/" ]