Granular cloud restore with multi storage class support

A non-transitory machine readable medium comprising instructions for performing a method, which when executed by a machine, causes the machine to perform operations comprising:

• obtaining identifiers of content items within a directory from a cloud directory iterator for a restore operation utilizing objects storing snapshot data of a volume comprising the directory, the objects stored within an object store of a cloud storage provider;
• issuing single file restore operations for each content item using the identifiers;
• monitoring a status of the single file restore operations;
• in response to receiving a failure indication associated with an object targeted by a single file restore operation, continuing to traverse the directory until reaching an end of the directory by:
• obtaining a set of identifiers from the cloud directory iterator for unrestored content items;
• obtaining object identifiers for unrestored objects storing data for the unrestored content items identified by the set of identifiers;
• and
• saving the object identifiers into an object identifier map;
• in response to reaching the end of the directory, reading the object identifiers from the object identifier map;
• and
• issuing one or more commands to the cloud storage provider to move the unrestored objects to a first storage tier from a second storage tier of the object store based upon the unrestored objects not being in the first storage tier.

A computing device comprising:

• a memory storing instructions;
• and
• a processor coupled to the memory, the processor configured to execute the instructions to perform operations comprising:
• executing a depth first traversal of a directory and one or more sub-directories for a restore operation utilizing objects storing snapshot data of a volume comprising the directory, the objects stored within an object store of a cloud storage provider;
• issuing, by the depth first traversal, one or more restore transfer commands to the cloud storage provider for restoring directory and subdirectory content items from a first storage tier of the object store;
• determining that an object targeted by the restore operation is stored within a second storage tier of the object store, in response to the cloud storage provider indicating that the object is not stored in the first storage tier;
• generating an object identifier map with object identifiers of unrestored objects targeted by the restore operation while continuing with the depth first traversal;
• failing the restore operation and issuing a command to the cloud storage provider to move objects identified by the object identifier map from the second storage tier to the first storage tier;
• and
• reissuing the restore operation as a reissued restore operation to restore data from the unrestored objects.