Greetings all.
I have recently upgraded my storage hardware to include a new SAS3 HBA (9300-8e) from LSI along with an Intel SAS3 expander (RES3TV360) but have been experiencing what I would consider a low bandwidth situation. For testing I have a single SSD drive connected (Samsung 850 Pro) that is connected to the expander via fanout cable, and the expander is connected back to the HBA.
When attempting to run a copy operation with the Samsung as the destination drive, the copy speed hovers right around 360MB a second. The source drive in this scenario is another samsung 850 pro connected directly to the systems motherboard via Sata3 port.
Next, I ran a copy operation with the Samsung drive connected to the expander as the source, and the destination drive as a direct connected Toshiba SSD. The speec for this operation topped out at about 315MB a second.
After running the tests through the expander, I disconnected everything and plugged all of the drives directly into the motherboard. Re-running the same tests, all drives hovered around 520MB a second.
Unfortunately I will not be able to test with a drive directly attached to the HBA until tomorrow when a new batch of cables arrive, but I was not expecting this level of speed after the upgrade from SAS2 hardware.
If it helps to identify the issue, the other hardware in this setup consists of an Intel i7-5960X on an ASRock board. The other PCI-E devices in the system are 1 nvidia GT730 for basic video output, and an intel 10Gb NIC. All of the devices are in at minimum x8 slots. One or two are in x16 slots. Closest device to the CPU is the intel NIC, followed by the GPU 2 slots down, followed by the HBA on the bottom x8 slot.
I would greatly appreciate any help. If it turns out my expectations were misaligned and I need different hardware to get full SSD speed through this setup, I would welcome any opinions or observations about other hardware. For now I'm going to piddle with the PCI-E order just to rule that out as a potential problem.
Thanks,
D
I have recently upgraded my storage hardware to include a new SAS3 HBA (9300-8e) from LSI along with an Intel SAS3 expander (RES3TV360) but have been experiencing what I would consider a low bandwidth situation. For testing I have a single SSD drive connected (Samsung 850 Pro) that is connected to the expander via fanout cable, and the expander is connected back to the HBA.
When attempting to run a copy operation with the Samsung as the destination drive, the copy speed hovers right around 360MB a second. The source drive in this scenario is another samsung 850 pro connected directly to the systems motherboard via Sata3 port.
Next, I ran a copy operation with the Samsung drive connected to the expander as the source, and the destination drive as a direct connected Toshiba SSD. The speec for this operation topped out at about 315MB a second.
After running the tests through the expander, I disconnected everything and plugged all of the drives directly into the motherboard. Re-running the same tests, all drives hovered around 520MB a second.
Unfortunately I will not be able to test with a drive directly attached to the HBA until tomorrow when a new batch of cables arrive, but I was not expecting this level of speed after the upgrade from SAS2 hardware.
If it helps to identify the issue, the other hardware in this setup consists of an Intel i7-5960X on an ASRock board. The other PCI-E devices in the system are 1 nvidia GT730 for basic video output, and an intel 10Gb NIC. All of the devices are in at minimum x8 slots. One or two are in x16 slots. Closest device to the CPU is the intel NIC, followed by the GPU 2 slots down, followed by the HBA on the bottom x8 slot.
I would greatly appreciate any help. If it turns out my expectations were misaligned and I need different hardware to get full SSD speed through this setup, I would welcome any opinions or observations about other hardware. For now I'm going to piddle with the PCI-E order just to rule that out as a potential problem.
Thanks,
D
