dRAID – Introducing Parity Declustering RAID

Declustered RAID decreases resilvering times, restoring a pool to full redundancy in a fraction of the time over the traditional RAIDz. We look at OpenZFS, the first freely distributed open source solution to offer a parity declustered RAID feature.

By Petros Koutoupis

Updated Sep 2, 2026 9:52 AM / Published Dec 3, 2022 3:00 AM 9 min read

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Petros Koutoupis

Petros Koutoupis is a senior performance software engineer at Cray (now HPE) for its Lustre High Performance File System division. He is also the creator and maintainer of the RapidDisk Project [www.rapiddisk.org].