Hi all,
I am trying to figure out which mother board to get for a build and want to check my maths for PCIe speeds with SAS cards.
The plan is to build an 8x8Tb ZFS-3 for Plex and storage with space for an additional 8 drives for future expansion and hot swaps. This would need 2 x LSI 9211-8i.
The board im looking at is Supermicro MBD-X11SSM-F which has 1 x PCIe 3.0 x8 and 2 x PCIe 3.0 x8 (x4 Bandwidth). But the LSI SAS HBA9211-8i cards are PCIe x8 running at x8. Obviously putting them into a x8 slot running at x4 will result in a speed drop.
But would this be a problem? x4 runs at 4GB/s while x8 runs at 8GB/s. With 8 x Ironwolfs each running at 250MB/s this only comes to 2GB/s so there should be no speed contraints? I only forsee a problem if running SSDs through this, which i wont be as they will be direct into the motherboard.
Does this make sense?
Thanks
I am trying to figure out which mother board to get for a build and want to check my maths for PCIe speeds with SAS cards.
The plan is to build an 8x8Tb ZFS-3 for Plex and storage with space for an additional 8 drives for future expansion and hot swaps. This would need 2 x LSI 9211-8i.
The board im looking at is Supermicro MBD-X11SSM-F which has 1 x PCIe 3.0 x8 and 2 x PCIe 3.0 x8 (x4 Bandwidth). But the LSI SAS HBA9211-8i cards are PCIe x8 running at x8. Obviously putting them into a x8 slot running at x4 will result in a speed drop.
But would this be a problem? x4 runs at 4GB/s while x8 runs at 8GB/s. With 8 x Ironwolfs each running at 250MB/s this only comes to 2GB/s so there should be no speed contraints? I only forsee a problem if running SSDs through this, which i wont be as they will be direct into the motherboard.
Does this make sense?
Thanks