Because the replica placement logic is under our control, the replication and placement policy can be changed dynamically. Single-level storage (SLS) or single-level memory is a computer storage term which has had two meanings. As a second order optimization, Atlas co-locates replicas of VMs discovered to be similar, to allow for cross VM deduplication while keeping all data local. For any VM, there will be a set of nodes which contains the entire history of that VM locally. For example, the chain of snapshots illustrated in Figure 1. This allows for us to run data management jobs for files on any of these three nodes with the data completely local.Ītlas also groups files logically when it comes to placement. Single-level storage is one of the most unique and compelling characteristics of the architecture underlying the IBM i server and its predecessor business machines. Put another way, for a file with three replicas, three nodes in our system will each contain the entirety of the data representing that file. In order to make these operations efficient, Atlas places entire file replicas on specific nodes, rather than spreading the data blocks backing the file randomly throughout the system. Almost all operations in our system involve operating on the content of a VM. One of the reasons we chose to create Atlas was to have fine grain control of replica placement in order to co-locate related data.
#Atlas os single level storage full
Internally, Atlas stores each snapshot as its own file, with the first being a full copy of the VM and each subsequent an incremental delta from the previous. Conceptually, Atlas stores a set of versioned files: each VM is a file, and each snapshot a version of that file. With auto-scaling enabled, Atlas automatically scales your cluster tier, storage capacity, or both in response to cluster usage. It was designed specifically to support the time machine paradigm. In order to efficiently store the entire history of a VM, it represents each snapshot as a delta, with each delta containing only the data which has changed since the previous snapshot.Ītlas is Rubrik’s Cloud-Scale File System at the foundation of the storage layer. It periodically takes snapshots of an enterprise’s virtual machines (VMs), allowing for instant recovery to a previous point in time. Rubrik is a time machine for virtualized infrastructure.
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