Write I/O requests are
issued concurrently to all members of the shadow set. Because each
member must be updated before the I/O request is considered complete,
the overall completion time for a write operation is determined by
the member unit with the longest access time from the node issuing
the write request. Depending on how the shadow set is configured and
the access paths to the individual member units, you might observe
a slight increase in the time it takes to complete write I/O requests.
The steady state performance is generally better to a member that
is locally connected because the access path is shorter and more direct
than the access path to a served member. For example, you might notice
degraded write performance on shadow sets that include some members
that are accessed through an MSCP server across a network link, where
each member is locally connected to a separate node.