How much SAN throughput is needed over iscsi at 1000iops?

Question

iSCSI

what network bandwidth is needed for SAN for every 1000iops using the iscsi protocol?

Answer 1

"Why don't we count, dear Moles" (Thumbelina).
1000 iops = 1000 I/O operations per second. Let's assume that we have 80/20% read / write blocks of 128 kilobytes. Since our reading / writing is full duplex, we will take 128 * 8 * 800 = 819200 kilobits or 800 megabits for reading. Well, this is in theory, in practice you still need to take into account the overhead costs for protocols, and this will add from 20 to 60%.

Answer 2

Uh-huh, and we must take into account that in the forwarding of SAN traffic by means of Ethernet (we are considering Ethernet, after all?), the delays of both Ethernet itself and network equipment begin to play quite strongly. So focus on 10Gb / s, because. at 1Gb/s, the real system performance will not be very high.