Requests for I/O operations on a logical volume can be biased toward sequential access, random access, or a balanced mix of the two types of access. You can use the bias of these requests (in conjunction with the I/O bias property) to help optimize the performance of the volume.
As a Quality of Service (QoS) property, the access bias indicates to the system the expected pattern that is typically used to access the data in a volume:
- Sequential
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Indicates that the read requests and the write requests operate on the data mostly by accessing the records one after the other in a physical order.
- Random
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Indicates that the read requests and the write requests operate on the data mostly by accessing the records in an arbitrary order.
- Mixed
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Indicates that the read requests and the write requests operate on the data sometimes in sequential order and sometimes in random order.
Note: Access bias specifies an optimization bias. Access bias is not a requirement that all data operations conform to the specified access method.