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What is the difference between ReadSector0 and TUR path checkers with device-mapper-multipath on Red Hat Enterprise Linux?

Solution Verified - Updated 2013-04-12T15:42:58+00:00 -

Issue

Do you have doc explaining the difference between ReadSector0 and Tur ?

Environment

Red Hat Enterprise Linux (all varieties)
device-mapper-multipath to manage SAN storage.
- Option to use either readsector0 or TUR (Test-Unit-Ready) path checkers.

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