US 2020/0285620 A1Published application

Content-based data migration

AssigneeDatrium, Inc.

InventorR. Hugo Patterson

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Abstract

Techniques are described for migrating namespace content from a source system to a target system. Migrating the namespace content involves copying data associated with a namespace from the source system to the target system in a manner that allows guests on both the source system and the target system to access the data during the namespace migration. Further the techniques take advantage of any replica of the namespace content that may already exist in target system, so that only blocks that are not already in the target system are copied as part of the migration operation. Both the source system and the target system use Content Addressable Storage, and have fingerprint indexes that allow blocks to be located based on their fingerprints. Thus, the target system to which a namespace is migrated may determine whether a desired block from the namespace can be obtained locally based on whether its fingerprint index has an entry for the fingerprint of the block.

Claims32

Dependent claims

A method of migrating a namespace from a source system to a target system, comprising:

during a pre-migration phase, causing:
requests to read blocks from the namespace, issued from source-based guests, to be directed to the source system, wherein the source-based guests are guests executing on hosts that belong to the source system;
and
requests to read blocks from the namespace, issued from target-based guests, to be directed to the target system, and if the blocks are not in the target system, to be directed to the source system, wherein the target-based guests are guests executing on hosts that belong to the target system;
requests to write blocks to the namespace, issued from either source-based guests or target-based guests, to be directed to the source system;
transitioning from the pre-migration phase to a home-change phase by establishing the target system as the home system of the namespace;
during the home-change phase, causing:
requests to read blocks from the namespace, issued from source-based guests, to be directed to the source system, and if the blocks are not in the source system, to be directed to the target system;
requests to read blocks from the namespace, issued from target-based guests, to be directed to the target system, and if the blocks are not in the target system, to be directed to the source system;
and
requests to write blocks to the namespace, issued from either source-based guests or target-based guests, to be directed to the target system.

8 more elements

One or more non-transitory computer-readable media of storing instructions for migrating a namespace from a source system to a target system, the instructions including instructions which, when executed by one or more computing devices, cause:

during a pre-migration phase, causing:
requests to read blocks from the namespace, issued from source-based guests, to be directed to the source system, wherein the source-based guests are guests executing on hosts that belong to the source system;
and
requests to read blocks from the namespace, issued from target-based guests, to be directed to the target system, and if the blocks are not in the target system, to be directed to the source system, wherein the target-based guests are guests executing on hosts that belong to the target system;
requests to write blocks to the namespace, issued from either source-based guests or target-based guests, to be directed to the source system;
transitioning from the pre-migration phase to a home-change phase by establishing the target system as the home system of the namespace;
during the home-change phase, causing:
requests to read blocks from the namespace, issued from source-based guests, to be directed to the source system, and if the blocks are not in the source system, to be directed to the target system;
requests to read blocks from the namespace, issued from target-based guests, to be directed to the target system, and if the blocks are not in the target system, to be directed to the source system;
and
requests to write blocks to the namespace, issued from either source-based guests or target-based guests, to be directed to the target system.

8 more elements

Dependencies are inferred from the claim text.