Viewing connected storage

Select the LUNs tab on the Storage Edge Configuration page to verify which LUNs have been exported to the Edge appliance. Each Edge requires a dedicated LUN in the data center storage configuration. The page displays the LUN alias name and serial number, type, current connection status, LUN ID, size, amount of cached data, whether it is pinned, and the client type. Click the LUN alias to perform any of the following actions related to that LUN:

• View the initiators and initiator groups that have access to the LUN.

• View snapshot history and snapshot details.

If you are using the server-level backups feature (available as of version 4.6), you can trigger backups from the Servers tab instead of the LUNs tab. See Viewing connected servers for more information.

• Enable proxy backup (must be configured on the Core).

• View the snapshot schedule for the LUN.

• iSCSI LUNs and Block disk LUNs—Store production data. These two types of LUNs share the space of the Edge blockstore cache and continuously replicate the data while staying synchronized with the associated LUN back at the data center. The Edge cache keeps only the working set of data blocks for these LUNs, while the remaining data is kept at the data center and predictably retrieved at the edge as needed. During WAN outages, edge servers are not guaranteed to operate and function at 100 percent because some of the data that might be needed could be at the data center and not locally present in the Edge blockstore cache. iSCSI LUNs and Blockdisk LUNs behave differently on the Core; on Edges there are no differences in their behavior.

• Local LUNs—Store transient and temporary data. Local LUNs also use dedicated space in the blockstore cache of the Edge, but never replicate the data back to the data center, because it is not required in the case of disaster recovery.

The tab also displays whether a LUN is pinned. Pinned LUNs use dedicated space in the Edge to store production data. The space required and dedicated in the Edge blockstore cache is equal to the size of the LUN provisioned at the data center. This allows the Edge servers to continue to operate and function even during WAN outages, because 100 percent of data is kept in Edge blockstore cache. Like regular LUNs, the data is replicated and synchronized with the associated LUN back at the data center.