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11 votes

Which specs should I look for (or avoid) when searching for a iSCSI 10Gbit ethernet switch, independent of brand?

In a word: deep buffers, preferably per-port buffers iSCSI does not tolerate frame drops. Delays are sort of ok, but a switch dropping a frame will create all manner of issues. (Finding buffer size -...
Ricky's user avatar
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8 votes

Which specs should I look for (or avoid) when searching for a iSCSI 10Gbit ethernet switch, independent of brand?

Make sure the switch is non-blocking. That is, the switch backplane can support all ports at line rate with no oversubscription. For a 24-port switch, the minimum backplane bandwidth is 24 x 10G, or ...
Ron Trunk's user avatar
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6 votes
Accepted

Why doesn't Ethernet protocol support switch fabric topology?

"Switched fabric" (SW) is mainly used for Fibre Channel networks as its contrasts the other FC topologies point-to-point (P2P) and arbitrated loop (AL). The point in SW being that there are multiple, ...
Zac67's user avatar
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4 votes

Which specs should I look for (or avoid) when searching for a iSCSI 10Gbit ethernet switch, independent of brand?

Be sure to understand what your iSCSI implementation on the end systems has to say about LACP (Port Aggregation) and/or if it mandates path isolation, to have two completely independent network paths ...
Marc 'netztier' Luethi's user avatar
3 votes
Accepted

Question regarding MTU settings on a Cisco 3750X Switch

Setting the switch to use MTU of 9k globally will not be an issue for host device interfaces that are programmed to use 1500 as a maximum. The host will compile frames that have an MTU size of 1500 ...
SleepyMan's user avatar
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3 votes
Accepted

What is the difference between Host Bus Adapters, Converged Network Adapters and Network Interface Card?

To understand the terms you have to understand some history. A "host bus adaptor" was originally something used to connect a SCSI storage bus to a host computer. You could in theory have multiple ...
Peter Green's user avatar
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3 votes

iSCSI/FCoE/FC Throughput Formulas

IOPs depend mainly on throughput capabilities and latencies of your storage hardware and (to a much lesser extent) latencies in your network. In other words, you can't "translate" a certain ...
Zac67's user avatar
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3 votes

Which specs should I look for (or avoid) when searching for a iSCSI 10Gbit ethernet switch, independent of brand?

In complement to Ron's answer, you need to look for Jumbo Frame. That is not mandatory, but it will significantly improve the bandwidth. A good point too is the latency. It should ideally be below ...
Bruno Mairlot's user avatar
2 votes

FibreChannel topology

N-port is a node port, actually it's HBA on a server or a port on a storage array. It is used to connect a node to a Fibre Channel switch. On Brocade switch you would usually have F-port, which is "...
Mikhail Zakharov's user avatar
2 votes

Which addresses are used in fcp header?

Source/Destination addresses here are 24 bit FC Port addresses which consist of 3 bytes: Domain ID, Area ID and Node ID. Details you can find, for example, here: https://www.storagefreak.net/2014/10/...
Mikhail Zakharov's user avatar
1 vote
Accepted

Right Cisco switch for iSCSI SAN network

2950's are too slow, and their buffers way too small for iSCSI. 2960's will work in a pinch, but their buffers are really small as well. (I've run iSCSI SANs on 2960S's. For low traffic levels it will ...
Ricky's user avatar
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1 vote

FibreChannel topology

Point-2-point mode is the opposite of arbitrated-loop mode (AL). You usually do not want AL if there's a switch. Set all ports to P2P at all times unless you really do need AL mode (when you chain ...
Zac67's user avatar
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1 vote

Advantage of SAN over a NAS storage that is mounted to a device?

A NAS is a (possibly) simple storage device, featuring various protocols for storage access, often including iSCSI. There is an extremely wide range of different devices, features and performance ...
Zac67's user avatar
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