This saga could also be named “Why my very expensive LSI 9305-24i drops disks?”.
I recently acquired (from ebay as I cannot justify giving $2000NZ to local scumbags) an LSI 9305-24i controller to drive a 24bay NAS.
The reason switching from LSI 9112-8i with RES2CV360 SAS2 expander is because the LSI 9112-8i is bottlenecked by the 8x PCIe 2.0, thus limiting the throughput of a 24 disk array to about ~100MB/s per disk.
The LSI 9305-24i made a significant boost in the performance, with ~200MB/s (maxing out Seagate Ironwolfs) per disk.
Continue reading A peculiar case of I/O errors with cheap SFF-8643 cables