Compound storage system
A compound storage system including: a storage box having a plurality of storage devices; and a plurality of servers capable of executing one or more virtual machines. The storage box stores a logical volume. The virtual machines executable by the server include an application VM and a controller VM. When a predetermined situation occurs in which an application VM of a migration source server is migrated to a predetermined migration destination server, at least one processor of the one or more servers in the compound storage system migrates the application VM to the migration destination server, and migrates a control right of a logical volume used by the application VM to a controller VM of the migration destination server.
1. A compound storage system comprising:
a storage box having a plurality of storage devices; and
a plurality of servers capable of executing one or more virtual machines,
wherein the storage box stores a logical volume,
the virtual machines executable by the server include an application virtual machine (VM) that executes an application using the logical volume, and a controller VM that configures a controller capable of controlling read and write with respect to a logical volume for which the controller has a control right,
when a predetermined situation occurs in which an application VM of a migration source server is migrated to a predetermined migration destination server,
at least one processor of the one or more servers in the compound storage system is configured to:
migrate the application VM to the migration destination server,
migrate a control right of a logical volume used by the application VM to a controller VM of the migration destination server, and
transfer cache data stored in a cache memory of a controller VM of the migration source server of a logical volume used by the application VM to a cache memory of a controller VM of the migration destination server.
2. The compound storage system according to claim 1 , wherein the predetermined situation is when a new server is added to the compound storage system, and the migration destination server is the new server.
3. The compound storage system according to claim 1 , wherein the predetermined situation is when a migration source server having an application VM is deleted, and the migration destination server is another server of the compound storage system.
4. The compound storage system according to claim 1 , wherein the predetermined situation is when a migration source server having an application VM is replaced with a new server, and the migration destination server is the server for replacement.
5. A compound storage system comprising:
a storage box having a plurality of storage devices; and
a plurality of servers capable of executing one or more virtual machines,
wherein the storage box stores a logical volume,
the virtual machines executable by a server include an application VM that executes an application using the logical volume, and a controller VM that configures a controller capable of controlling read and write with respect to a logical volume for which the controller has a control right,
when a predetermined situation occurs in which a configuration of the server of the integrated storage system is changed,
at least one processor of the one or more servers in the compound storage system is configured to:
transfer a right to allocate a storage area of the storage box possessed by a first server to a controller VM of a second server, and
transfer cache data stored in a cache memory of a controller VM of the migration source server of a logical volume used by the application VM to a cache memory of a controller VM of the migration destination server.
6. The compound storage system according to claim 5 , wherein the predetermined situation is a situation in which the second server is added to the compound storage system.
7. The compound storage system according to claim 5 , wherein the predetermined situation is a situation in which the first server is deleted from the compound storage system.
8. The compound storage system according to claim 5 , wherein the predetermined situation is a situation in which the first server is replaced with the second server.