Abstract: A system prompts a key manager to provide access keys, to access resources stored by a shared storage, for a group of services hosted by nodes of a cluster. The group of services receive the access keys from the key manager. The first service in the group of services uses the first access key to create a signing key, which is used to sign a request, which is sent to the shared storage, which enables access to the first resource. The system detects the second service in the group of services becoming unavailable for the cluster. The system informs the key manager that the second service is removed from the groups of services, which prompts the key manager to invalidate use of the access key provided for the second service, after which the first service continues using the first access key to access the first resource.

Abstract: A system prompts a key manager to provide access keys, to access resources stored by a shared storage, for a group of services hosted by nodes of a cluster. The group of services receive the access keys from the key manager. The first service in the group of services uses the first access key to create a signing key, which is used to sign a request, which is sent to the shared storage, which enables access to the first resource. The system detects the second service in the group of services becoming unavailable for the cluster. The system informs the key manager that the second service is removed from the groups of services, which prompts the key manager to invalidate use of the access key provided for the second service, after which the first service continues using the first access key to access the first resource.

Abstract: Techniques for data migration of a storage system are described herein. According to one embodiment, for at least one of segments of a file to be migrated from a source storage tier to a target storage tier, a fingerprint of the segment is transmitted to the target storage tier. In response to a response received from the target storage tier indicating that the segment has not been stored in the target tier based on the fingerprint, a storage space of the target tier estimated for migrating the file is incremented. One or more segments of the file that have not been stored in the target tier are migrated if the one or more segments of the file fit in the target storage tier based on the estimated storage space of the target tier.

Abstract: Techniques for data migration of a storage system are described herein. According to one embodiment, a candidate index is generated to store information identifying a plurality of segments associated with one or more candidate files of a source storage tier to be migrated to a target storage tier of a storage system. Segments of the one or more candidate files are then migrated from the source storage tier to the target storage tier according to a sequential order, and based on the candidate index.

Abstract: Techniques for data migration of a storage system are described herein. According to one embodiment, a list of files stored in a source storage tier is identified as candidate files to be migrated to a target storage tier based on a migration policy. One of a regular data movement method and a bulk data movement method is selected based on a characteristic of the candidate files. The candidate files are then migrated from the source storage tier to the target storage tier using the selected data movement method.

Abstract: A method, article of manufacture, and apparatus for processing information are disclosed. In some embodiments, this includes mapping a target multi-controller system, determining a target controller to send a data chunk to based on the mapping, determining if the target controller is missing any portion of the data chunk, and sending the missing portions of the data chunk to the target controller. In some embodiments, sending the missing portions of the data chunk to the target controller includes sending the missing portions of the data chunk from a source multi-controller system to the target. The source multi-controller system may have a first number of controllers and the target multi-controller system may have a second number of controllers.