2 ms·

If your drives are only managing 100MB/s then something is wrong, SATA 3 should be at least 500MB/s.

wongarsu 1y ago
SATA 3 can move 500MB/s, but high-capacity drives typically can't. They are all below 300MB/s sustained even when shiny new. Look for example at the performance numbers quoted in these data sheets [1][2][3][4], all between 248 MiB/s and 272 MiB/s. Now that's still a lot faster than 100MB/s. But I have a lot of recertified drives, and while some of them make the advertised numbers some of them have settled at 100MB/s. You could argue that is something wrong with them, but they are in a raid and I don't need them to be fast. That's what the SSD cache is for. 1: Page 3 https://www.seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/exos-x24/exos-x24-DS2080-2307US-en_US.pdf https://www.seagate.com/content/dam/seagate/en/content-fragm... 2: Page 2 https://www.seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/exos-m-v2/exos-m-v2-DS2045-3-2506-en_US.pdf https://www.seagate.com/content/dam/seagate/en/content-fragm... 3: Page 2 https://www.westerndigital.com/content/dam/doc-library/en_us/assets/public/western-digital/product/data-center-drives/ultrastar-dc-hc600-series/data-sheet-ultrastar-dc-hc690.pdf https://www.westerndigital.com/content/dam/doc-library/en_us... 4: Page 7 https://www.seagate.com/content/dam/seagate/assets/products/nas-drives/ironwolf-pro-hard-drive/files/Seagate_IronWolf_Pro_SATA_Product_Manual_32-30-28-24TB_207967700B.pdf https://www.seagate.com/content/dam/seagate/assets/products/...
- nubinetwork 1y ago
  I had a 12 disk striped raidz2 array comprised of wd gold drives that could push 10Gbit/s over the network, while scrubbing, while running 10 virtual machines, and still had plenty of IO to play with. /shrug
- guenthert 1y ago
  Spinning rust drives tend to be much faster on the outer than the inner tracks.

SATA 3 can move 500MB/s, but high-capacity drives typically can't. They are all below 300MB/s sustained even when shiny new. Look for example at the performance numbers quoted in these data sheets [1][2][3][4], all between 248 MiB/s and 272 MiB/s. Now that's still a lot faster than 100MB/s. But I have a lot of recertified drives, and while some of them make the advertised numbers some of them have settled at 100MB/s. You could argue that is something wrong with them, but they are in a raid and I don't need them to be fast. That's what the SSD cache is for. 1: Page 3 https://www.seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/exos-x24/exos-x24-DS2080-2307US-en_US.pdf https://www.seagate.com/content/dam/seagate/en/content-fragm... 2: Page 2 https://www.seagate.com/content/dam/seagate/en/content-fragments/products/datasheets/exos-m-v2/exos-m-v2-DS2045-3-2506-en_US.pdf https://www.seagate.com/content/dam/seagate/en/content-fragm... 3: Page 2 https://www.westerndigital.com/content/dam/doc-library/en_us/assets/public/western-digital/product/data-center-drives/ultrastar-dc-hc600-series/data-sheet-ultrastar-dc-hc690.pdf https://www.westerndigital.com/content/dam/doc-library/en_us... 4: Page 7 https://www.seagate.com/content/dam/seagate/assets/products/nas-drives/ironwolf-pro-hard-drive/files/Seagate_IronWolf_Pro_SATA_Product_Manual_32-30-28-24TB_207967700B.pdf https://www.seagate.com/content/dam/seagate/assets/products/...

nubinetwork 1y ago
I had a 12 disk striped raidz2 array comprised of wd gold drives that could push 10Gbit/s over the network, while scrubbing, while running 10 virtual machines, and still had plenty of IO to play with. /shrug
guenthert 1y ago
Spinning rust drives tend to be much faster on the outer than the inner tracks.