Qiuping Wang
ABSTRACT
Zoned Namespace (ZNS) provides the Zone Append primitive to boost the write performance of ZNS SSDs via intrazone parallelism. However, making Zone Append effective for a RAID array of multiple ZNS SSDs is non-trivial, since Zone Append offloads address management to ZNS SSDs and requires hosts to dedicatedly manage RAID stripes across multiple drives. We propose ZapRAID, a high-performance software RAID layer for ZNS SSDs by carefully using Zone Append to achieve high write parallelism and lightweight stripe management. ZapRAID's core idea is a group-based data layout with coarse-grained ordering across multiple groups of stripes, such that it can use small-size metadata for stripe management on a per-group basis. Our prototype evaluation shows that ZapRAID achieves a 2.34x write throughput gain compared with using the Zone Write primitive.
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Index Terms
- ZapRAID: Toward High-Performance RAID for ZNS SSDs via Zone Append
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