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Understanding Shadow Migration
Understanding Shadow Migration
Shadow migration uses interposition, but it is integrated into the appliance and does not require
a separate physical machine. When filesystems are created, they can optionally "shadow" an
existing directory, either locally or over NFS. In this scenario, downtime is scheduled once,
where the source appliance X is placed into read-only mode, a share is created with the shadow
property set, and clients are updated to point to the new share on the Oracle ZFS Storage
Appliance. Clients can then access the appliance in read-write mode.
FIGURE 30
Once the shadow property is set, data is transparently migrated in the background from the
source appliance locally. If a request comes from a client for a file that has not yet been
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Oracle ZFS Storage Appliance Administration Guide, Release OS8.6.x • September 2016
Shadow Migration
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