Abstract: Some examples relate to prefetching data in a distributed storage system. In an example, a first storage node may receive I/O requests sent by a host system, for sequential data of a storage volume distributed across a plurality of storage nodes. The first storage node may determine whether the host system is aware or unaware of layout information of the storage volume. If the host system is unware, the first storage node may prefetch the sequential data of the storage volume from other nodes of the plurality of storage nodes. If the host system is aware, the first storage node may indicate to a second storage node that the I/O requests by the host system are for the sequential data of the storage volume.

Abstract: Some examples relate to data deduplication. In an example, upon addition or modification of a data unit in a data storage device, a Context Triggered Piecewise Hash (CTPH) key may be generated for an added or modified data unit. CTPH key of the added or modified data unit may be compared with a group CTPH key for each of a plurality of groups of data units stored in the data storage device to identify a group whose group CTPH key is within a pre-defined edit distance from the CTPH key of the added or modified data unit. A duplicate of the added or modified data unit may be identified within the identified group.