Our objective is twofold: the characterization of digital disk management in a public giant scale cloud. §3 presents digital disk characterization results. With time, backing file chains can develop into very long (see §3). We should take some control about how we see stuff based mostly on that method. For efficiency reasons, L1 and L2 entries are cached in RAM (see bellow). With its small dimension, the whole content material of L1 is loaded in RAM at VM boot time. To speed up access to L1 and L2 tables, Qemu caches them in RAM. Our third contribution (§5) is to handle these scalability by evolving Qcow2 and introducing two key rules: 1) direct entry upon an I/O request, no matter their position in the chain; 2) using a single Qcow2 metadata cache, avoiding memory duplication by being independent of the chain length. The file is divided into units named clusters, that may include both metadata (e.g, a header, indexation tables, etc.) or information that represent ranges of consecutive sectors. To preserve backward compatibility, we depend on reserved bits in Qcow2’s metadata. Our solution tackles Qcow2’s scalability issues regarding IO efficiency and memory footprint.

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