Shutting Down a Clustered Configuration (CLI)
failed controller to its surviving peer and include network interfaces and storage pools.
Because a network interface is a collection of IP addresses used by clients to find a known
set of storage services, it is critical that each interface be assigned to the same controller
as the storage pool clients will expect to see when accessing that interface's address(es).
In Illustration 4, all of the addresses associated with the PrimaryA interface will always be
provided by the controller that has imported pool-0, while the addresses associated with
PrimaryB will always be provided by the same controller as pool-1.
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Private resources - Private resources are known only to the controller to which they are
assigned, and are never taken over upon failure. This is typically useful only for network
interfaces; see the following discussion of specific use cases.
FIGURE 16
ZS3-2 Clustering Example
Several other resource types exist; these are implementation details that are not exposed to
administrators. One such type is the symbiote, which allows one resource to follow another
as it is imported and exported. The most important use of this resource type is in representing
the disks and flash devices in the storage pool. These resources are known as disksets and
must always be imported before the ZFS pool they contain. Each diskset consists of half the
disks in an external storage enclosure; a clustered storage system may have any number of
disksets attached (depending on hardware support), and each ZFS pool is formed from the
storage devices in one or more disksets. Because disksets may contain ATA devices, they must
be explicitly imported and exported to avoid certain affiliation-related behaviors specific to
ATA devices used in multipathed environments. Representing disks as resources provides a
simple way to perform these activities at the right time. When an administrator sets or changes
the ownership of a storage pool, the ownership assignment of the disksets associated with it is
transparently changed at the same time. Like all symbiotes, diskset resources do not appear in
the cluster configuration user interface.
Configuring the Appliance 207
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