On one 2.5GbE link, large-file peak read about 295 MB/s and write almost 310 MB/s. Small-file writes peaked at 263 MB/s. Those copies are drive+RAID+link limited, not a dual-port aggregation test.
Test setup, measurements & limitations
Synology DS925+ Performance Review: How Fast Is It?
Tested: Four HAT3300-4T 4 TB HDDs in RAID 10. Two large videos total 18,246,061,069 bytes; 1,363 small clips/photos total 18,450,262,861 bytes. DS925+ link is described as 2.5GbE; client, RAM and DSM build unspecified. Archived page 1 and three benchmark images read; follow-up page remains unavailable.
Applies to: Exact enclosure, RAID 10, single 2.5GbE. Manufacturer 522/565 MB/s figures in the intro are official claims, not this test.
- On one 2.5GbE link, large-file peak read about 295 MB/s and write almost 310 MB/s. Small-file writes peaked at 263 MB/s. Those copies are drive+RAID+link limited, not a dual-port aggregation test.Source location: Read/Write Speed for Large/Small Files (Wayback 2025-07-31)
Measurements reported by the reviewer| Measurement | Result | Conditions & source location |
|---|
| Large-file peak read / write | Approximately 295 / 309.55 MB/s | Four HAT3300-4T in RAID 10; 18.246 GB two-video set. Read value comes from prose; write value visually verified in chart.Page 1, large-file results |
|---|
| Small-file peak read / write | 230.80 / 262.85 MB/s | Same RAID 10; 1,363 files totaling 18.450 GB, visual chart values.Page 1, small-file charts |
|---|
Limits to keep in mind
- Live TechARP 403; page 1 Wayback only.
- GbE/RAID follow-up page not read.
- Launch drive-policy sentence is dated versus DSM 7.3.
- The comparator DS223j is incorrectly labelled 2.5GbE although it has a 1GbE port. The claimed comparison at identical network speed is not adopted.
- Large-read chart remained blocked; approximately 295 MB/s is prose-only. RAID/network follow-up page returned access errors.