Deferred copy target pull of volume data

In a composite storage server comprising a plurality of interconnected peer distributed storage sites including a mount site, a source copy site and at least one copy target site for executing a storage of volume data within the composite storage server, a deferred copy target site comprising:

• a processor;
• and
• a memory storing instructions operable with the processor, the instructions executed for:
• receiving a communication of a source copy complete message from the mount site, the source copy complete message being indicative of the source copy site having a complete copy of the volume data;
• detecting a transition by the mount site of a host job from an active status to an inactive status in response to determining that an adequate redundancy of copies of the volume data at the copy target sites is achieved prior to expiration of a redundancy timer and subsequent to the communication of the source copy complete message from the mount site;
• in response to receiving the source copy complete message, determining, by the deferred copy target site, whether the host job has the inactive status as set by the mount site;
• querying, by the deferred copy target site, the peer distributed storage sites to determine one of the peer distributed storage sites having the complete copy of the volume data to pull in response to determining that the host job has the inactive status;
• and
• in response to determining that the host job has the inactive status, pulling, by the deferred copy target site, the volume data from the determined peer distributed storage site having the complete copy of the volume data.

In a composite storage server comprising a plurality of distributed storage sites including a mount site, a source copy site and at least one copy target site for executing a storage of volume data within the composite storage server, a method of operating an deferred copy target site comprising:

• the deferred copy target site receiving a communication of a source copy complete message from the mount site, the source copy complete message being indicative of the source copy site having a complete copy of the volume data;
• the deferred copy target site detecting a transition by the mount site of a host job from an active status to an inactive status in response to determining that an adequate redundancy of copies of the volume data at the copy target sites is achieved prior to expiration of a redundancy timer and subsequent to the communication of the source copy complete message from the mount site;
• in response to receiving the source copy complete message, the deferred copy target site determining whether the host job has the inactive status as set by the mount site;
• the deferred copy target site querying the peer distributed storage sites to determine one of the peer distributed storage sites having the complete copy of the volume data to pull in response to determining that the host job has the inactive status;
• and
• in response to determining that the host job has the inactive status, the deferred copy target site pulling the volume data from the determined peer distributed storage site having the complete copy of the volume data.