AddElementToMap adds to the given 'elem' to the 'sets' map with given 'key'.

NewStorageError creates a new custom storage error instance.

ErrVolAttachedOnRemoteNode is code when a volume is not attached locally but attached on a remote node.

ErrVolDetached is code for a volume is detached on the instance.

ErrVolInval is the code for a invalid volume.

ProviderOpsMaxRetries is the number of retries to use for provider ops.

ProviderOpsRetryInterval is the time to wait before each retry of provider ops.

ProviderOpsTimeout is the default timeout of storage provider ops.

SetIdentifierNone is a default identifier to group all disks from a particular set.

StorageError error returned for storage operations.

Ops interface to perform basic storage operations.