Question : Problem: Using Cisco 3560\3750 SFP port for Tape Library

I am going to be setting up a tape library. I am told with the library that I'm getting that there are two ways to set it up,

[svrs to be backed up]----->thru the lan---->[backup svr]--->SCSI--->[tape library]

or

[fiber nic]------>[fiber bridge]------>[tape library]

My question is, can I use a cisco switch (3560\3750) and plug the tape library in one of the spf ports on it?

I want to buy the switch to act as the 'fiber bridge' and since it's a gb switch and all the servers have gb nics, i just want them to have a gb connection to the tape library which itself is connected by fiber.

Also, in buying the switch, it says the SFP ports are empty, do I need to purchase a specific gbic or fiber module to plug into the spf port? And i'm assuming this module will depend what type of fiber connection is coming off the tape library, would that be correct? like SC to LC or someting another

Answer : Problem: Using Cisco 3560\3750 SFP port for Tape Library

In principle, you should be able to use a Majority Node Set as quorum. The quorum data will be replicated to the other cluster nodes, so there's no danger of the whole cluster failing because of one node failing. See the links below for further information.
But, to be frank, hearing "inexpensive" in conjunction with "server cluster" always gives me the creeps.
If you really have to have the increased uptime provided by a server cluster, then it should be a matter of course to invest into certified hardware and put that thing on a solid working basis. Using uncertified hardware might easily lead to the exact opposite of what you're trying to achieve, namely increased downtime of the complete cluster while trying to figure out why something isn't working, without even a chance to call Microsoft's support, or up to complete data loss of your production data. That can pretty quickly be way more expensive than investing into proper hardware. And note that the *complete* system has to be cluster certified, not only the individual components.
The Microsoft support policy for server clusters, the Hardware Compatibility List, and the Windows Server Catalog
http://support.microsoft.com/?kbid=309395
Not to mention that 2 licenses of Server 2003 Enterprise Edition, plus two licenses of Exchange Enterprise Edition will already cost a multiple of the $1K you mentioned above.

Network-Attached Storage and Server Cluster Support
http://support.microsoft.com/?kbid=812504

TechNet Support WebCast: Majority Node Set support in Microsoft Windows Server 2003 clusters
http://support.microsoft.com/?kbid=838612

Server cluster support for Windows Storage Server 2003 network attached storage devices
http://support.microsoft.com/?kbid=888374

Microsoft support policy on the use of network-attached storage devices with Exchange Server 2003
http://support.microsoft.com/?kbid=839687