Oracle ZFS Storage Appliance User Manual

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
Shadow Migration
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
428 Oracle ZFS Storage Appliance Administration Guide, Release OS8.6.x • September 2016

Oracle ZFS Storage Appliance Specifications

General

Connectivity	10GbE, 40GbE, InfiniBand, Fibre Channel
Protocols	NFS, SMB, iSCSI, Fibre Channel, HTTP
Operating System	Oracle Solaris
Data Protection	snapshots, clones, remote replication
Data Reduction	Inline compression, deduplication
High Availability	Redundant hardware components (controllers, power supplies, fans). Automatic failover between controllers. Hot-swappable drives and components. Cluster configurations for increased availability and scalability.
Management Interface	Web-based GUI, CLI, REST API
Storage Type	Hybrid (SSD + HDD), All-Flash
Storage Capacity	Up to several petabytes
Encryption	AES-256 encryption at rest