Backblaze use an in-house Java pseudo-RAID layer based on Reed-Solomon codes, with 17 data shards and 3 parity shards. There are some performance numbers here <a href="https:&#x2F;&#x2F;www.backblaze.com&#x2F;blog&#x2F;reed-solomon&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.backblaze.com&#x2F;blog&#x2F;reed-solomon&#x2F;</a> (2015).