I’m upgrading my array from 8x 4TB Seagate ST4000DM000 disks in a RAIDz2 pool to 8TB disks from both Seagate (ST8000VN004 Ironwolf) and HGST (HUH721008ALN600). All are SATA 7200 RPM disks.
Under Reporting → Disk, the HGST disks are reporting wildly higher throughput than the Seagates. Seems to be almost 7-10x as much. For example, during the last disk replacement/resilver:
All the Seagates (2x ST8000VN004 and 2x ST4000DM000) are topping out at about 170 Mebibytes/s, while all 4 of the HGST disks are approaching 1.5 Gibibytes/s. SATA III tops out at 6 Gbit, so I know that the read/write stats for the HGST drives can’t be right. The Seagate throughput seems reasonable though. Is this a known issue? I searched the forum, and I couldn’t find anything similar being mentioned.
The hardware is:
TrueNAS 25.10.3 - Goldeye
Netgear ReadyNAS 3312 (12 bay rackmount - all SATA interfaces)
16GB of ECC DDR4 UDIMM
Intel Xeon E3-1240 v5 CPU
(Edited to add TrueNAS version, RAID level and CPU model)