Non-blocking backup in a log replay node for tertiary initialization

A non-transitory computer-readable device having instructions stored thereon that, when executed by at least one computing device, cause the at least one computing device to perform operations comprising:

• determining whether a backup process is in progress based on backup block information, wherein the computing device is a secondary server of a three-tiered replication system, the secondary server operates as a mirror mode of a primary server of the three-tiered replication system, and the secondary server is a source node of a tertiary server;
• determining whether a replay list containing logical blocks indicated by replay block information intersects with a backup list containing logical blocks indicated by the backup block information;
• determining whether one or more logical blocks contained in the replay list have been backed up;
• upon a determination that the one or more logical blocks contained in the replay list have been backed up, replaying log information to determine the replay block information that identifies the one or more logical blocks to be modified in accordance with the log information;
• and
• performing a page-aligned backup process from the secondary server to the tertiary server.

A secondary server system, comprising:

• a memory;
• and
• at least one processor coupled to the memory and configured to:
• determine whether a backup process is in progress based on backup block information, wherein the secondary server system is included in a three-tiered replication system, the secondary server system operates as a mirror mode of a primary server of the three-tiered replication system, and the secondary server system is a source node of a tertiary server;
• determine whether a replay list containing logical blocks indicated by replay block information intersects with a backup list containing logical blocks indicated by the backup block information;
• determine whether one or more logical blocks contained in the replay list have been backed up;
• upon a determination that the one or more logical blocks contained in the replay list have been backed up, replay log information to determine the replay block information that identifies the one or more logical blocks to be modified in accordance with the log information and
• performing a page-aligned backup process from the secondary server system to the tertiary server.