Disks have a maximum number of concurrent I/O operations they can support; the limit varies according to the disk type. FlexShare limits the number of concurrent I/O operations per volume based on various values including the volume priority and the disk type.
For most customers, the default io_concurrency value is correct and should not be changed. If you have nonstandard disks or load, your system performance might be improved by changing the value of the io_concurrency option.
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