Originally posted by: mrp
Is there a best practice or a fan-out/server-port ratio of how many hosts be connected to an USP front-end port. I know i am just throwing a very generic question which has lots of "it depends". Two things come to my mind when i try to size how many servers can sit on a port :
* IOPS rate for a USP port. From documents i have read, it seems to indicate somewhere around 2500 IOPS is a good indication of need to spread load across more ports.
* Queue depths for a USP port. I guess it's 1024 on USP. so here it depends on number of hosts and number of LUNs attached to that port so that we not overrun port queue depth.
I consider the above two as a good rule of thumb to start with. Is there anything that i should be aware of when deciding servers-port ratio or is there a recommended/best practice magic number like 8:1 fan-out ratio of servers-port.