Parity-based RAID poses a design trade-off issue for large-scale SSD storage systems: it improves reliability against SSD failures through redundancy, yet its parity updates incur extra I/Os and garbage collection operations, thereby degrading the …
Redundant array of independent disk (RAID) offers a good option to provide device-level fault tolerance for solid-state drives (SSDs). However, parity update with either read-modify-write or read-reconstruct-write may introduce a lot of extra I/Os …
In parity-based RAID arrays, to update a data chunk, the corresponding parity chunk(s) must be updated accordingly so as to keep data consistency and availability. To achieve this, either read-modify-write (RMW) or read-construct-write (RCW) could be …
Modern distributed storage systems often deploy deduplication to remove content-level redundancy and hence improve storage efficiency. However, deduplication inevitably leads to unbalanced data placement across storage nodes, thereby degrading read …
RAID provides a good option to provide device-level fault tolerance. Conventional RAID usually updates parities with read-modify-write or read-reconstruct-write, which may introduce a lot of extra I/Os and thus significantly degrade SSD RAID …