I was told that using an iSCSI driver with existing network adapter would downgrade performance dramatically than using an iSCSI adapter. But has anyone really tested it out yet? What kind of performance downgrade are we talking about here?
Are you aware of any NIC vendors already incorporating what you called a TOE into their NIC?
An agent-based solution does not implement the iSCSI or TCP/IP protocol in firmware. This means the servers CPU has more processing overhead than with a true iSCSI adapter. (Each I/O request must be translated through the agent for output over the network interface.) I have not personally tested this but have been told by some of the iSCSI engineers that this is one of the stumbling blocks for iSCSI adoption. The good news is things in this industry happen FAST!
Vendors are now coming to market with iSCSI adapters that eliminate this problem. See: http://wwwip.emulex.com/ip/products/gn9000SI.html for one such adapter.
Editor's note: Do you agree with this expert's response? If you have more to share, post it in our Storage Networking forum at http://searchstorage.discussions.techtarget.com/WebX?50@@.ee83ce4 or e-mail us directly at email@example.com.
Dig deeper on ISCSI SAN
Related Q&A from Christopher Poelker
RAID can allow for better storage performance and higher availability, and there are many different RAID types. Read a comparison of RAID levels, as ...continue reading
SAN expert Chris Poelker discusses how to change the size of a LUN in a Microsoft cluster server environment.continue reading
SAN expert Chris Poelker compares connecting a SAN with wavelength cabling and dark fiber and discusses the pros and cons of each.continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.