Idk if this belongs here but here goes.
Sorry if this question is silly. I'm kind of a networking and storage noob.
So I recently got interested in storage servers and learned about SAS expanders and stuff.
I didn't know that SAS expanders were a thing, and I thought that if you wanted to connect 24 drives, you needed an HBA with 3 SFF8087 (one breaks out to 4 sata cables) connectors.
But now I've been looking at 60 bay disk shelfs like this, and they usually have QSFP+ or sff8087 ports on the back, and use SAS expanders.
I've learned that SAS expanders can be thought of like network switches, and they can distribute the bandwidth.
My question is this: let's say I got one of those 60 bay disk shelves, and ran one mini sas cable to my HBA on my server. Would individual drives be bottlenecked?
When an HBA like this is 6Gbps, does it mean that all the SAS ports are 6Gbps each or is the entire card running at 6Gbps?
Is the total bandwidth of the card the total bandwith of x8 pcie slot?
Seagate Exos enterprise 16TB drives advertise a max transfer rate of 260 MBps. if each mini sas sff 8087 cable has a max theoritical bandwidth of 6Gbps, can it run about 3 of these drives and adding more drives to one cable would mean each drive cannot perform at it's max?
This 60 bay disk shelf, for example, has 8 (looks like QSFP+ , idk I've never seen one in person) ports, so should I get two HBAs with 4 ports each so that I can connect to all of those 8 ports?
Would connecting to just 4, for example starve the individual drives of bandwidth and they won't be able to perform to their max speeds?
How about connecting just one cable?
I'm trying to find out whether it's just simple match, i.e, drive max speeds, and sas cable max bandwidth, and you don't run more drives off of one cable when the individual drives get bandwidth limited.
Sorry if this question is silly. I'm kind of a networking and storage noob.
So I recently got interested in storage servers and learned about SAS expanders and stuff.
I didn't know that SAS expanders were a thing, and I thought that if you wanted to connect 24 drives, you needed an HBA with 3 SFF8087 (one breaks out to 4 sata cables) connectors.
But now I've been looking at 60 bay disk shelfs like this, and they usually have QSFP+ or sff8087 ports on the back, and use SAS expanders.
I've learned that SAS expanders can be thought of like network switches, and they can distribute the bandwidth.
My question is this: let's say I got one of those 60 bay disk shelves, and ran one mini sas cable to my HBA on my server. Would individual drives be bottlenecked?
When an HBA like this is 6Gbps, does it mean that all the SAS ports are 6Gbps each or is the entire card running at 6Gbps?
Is the total bandwidth of the card the total bandwith of x8 pcie slot?
Seagate Exos enterprise 16TB drives advertise a max transfer rate of 260 MBps. if each mini sas sff 8087 cable has a max theoritical bandwidth of 6Gbps, can it run about 3 of these drives and adding more drives to one cable would mean each drive cannot perform at it's max?
This 60 bay disk shelf, for example, has 8 (looks like QSFP+ , idk I've never seen one in person) ports, so should I get two HBAs with 4 ports each so that I can connect to all of those 8 ports?
Would connecting to just 4, for example starve the individual drives of bandwidth and they won't be able to perform to their max speeds?
How about connecting just one cable?
I'm trying to find out whether it's just simple match, i.e, drive max speeds, and sas cable max bandwidth, and you don't run more drives off of one cable when the individual drives get bandwidth limited.