SoftLayer's iSCSI storage allows customers to access disk space on a high-performance iSCSI target. The storage is presented as a block-level device that customers can format to best fit their needs. iSCSI storage resides on the private network and all bandwidth to the iSCSI target does not count toward your public bandwidth allotment.
iSCSI storage may be instantly added through “Add Other Service” under “Sales” in the Customer Portal.
An iSCSI LUN represents a block-based storage device used to connect to your operating system. Once connected, the filesystem may be mounted for read/write access.
Failover is the manual act of designating the Replica to the active copy of data. When "failover" is initiated, the LUN is no longer available on the operating system (OS) to which it is connected and the replica may be connected to the OS.
Failback is the manual act of returning active status to the LUN and making the Replica unavailable. The "failback" process is long-running, because any data changes applied to the Replica are copied back to the paired LUN.
It is important to note that only when a Replica is available may failover and failback methods be used.
A Replica is available for iSCSI LUNs that have replication purchased and configured. When replication is configured on an iSCSI LUN, a Replica exists as a remotely located, moment-in-time duplicate. The remote location for the Replica is called the Replica Site. By having both the LUN and Replica available for an iSCSI, failover and failback method may be used.
Yes, you will notice the options for failover and failback on the replication page within the SoftLayer Customer Portal.