Bad performance in SAN environment for append AIO

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Issue

Because SAP recommends to use dft_extent_sz, which is set to 2 (2 pages for 16K each), any DB2 object is expanded exactly to 32k and on bulk inserts leads to exactly 32k append AIO, which doesn't perform as expected.

Environment

Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
sysbench IO tool from EPEL
Ext-4 filesystem

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