Steven J. Schwartz
So being involved with iSCSI since almost its inception, I’ve seen it go through several stages. When I was introduced to iSCSI back at the end of 2001, StorageTek was working on a product that they had no idea would be on the edge of greatness.
The Echoview400 was a Linux based storage appliance. The purpose of this appliance was CDP (continuous data protection). This was really an industry first both for CDP and for iSCSI. This platform only supported connectivity to Solaris and WindowsNT. This ran mostly in a direct connected mode, and on the host side it required 2 things. An iSCSI hardware HBA, and a software driver created by STK. The HBA was no big deal, other than expensive. The software was slick, it performed a split-write on internal hard-drives/volumes.
That was almost 6 years ago. These days, iSCSI HBAs are almost non-existent, most OS vendors have created iSCSI software initiators that are both easy to install, and low overhead. Back in 2002, the Windows iSCSI software initiator would typically overrun the CPUs on servers. Now they are barely noticed.
Back in 2002, 2GB Fibre Channel was the hot technology. Optical GigE was still popular, but expensive, and most enterprises had by this time deployed GigE core swtich technologies, however, the SMB market was not quite there yet. In 2002, if a company wanted to implement a site-to-site replication at the SAN level, they would have dropped something along the lines of Millions of dollars for storage, servers, and network. In 2007, many newer storage vendors have included the feature of replication into the base product.
Although, few have followed the model that EqualLogic, Inc. has in place where there are NO optional storage service features. Anything that has been released is included, and available to customer under support contracts.
So what does my typical customer look like? It ranges from a 5 server environment running on about 800GB of addressable storage, all the way to a multi-thousand server environment on it’s way to purchasing storage on the order of Petabytes. I have deployments in the largest law firms of our fair country, and the smallest radio stations.
So who uses iSCSI in production? Many many SMB and SME, Fortune 1000, and Fortune 50. What kind of applications are running on iSCSI? I’d have to say that of my customer base, 80% or more are running some level of OS virtualization. The market leader being VMWare, but a rising number are looking to Zen, and Windows Virtual Server. The guest OSs running are everything from Active Directory, Web servers, DNS, to clusters of SQL. It isn’t the virtual OS world that I find interesting. It is the dedicated server environment that has excited me. We have a growing number of customers that are running Oracle Financial, Oracle RAC, clustered file services, etc.
I sent a quick email out to an SE list I use to ask the occasional question. This time I needed Oracle Financial Applications references, within minutes I had dozens. Back in the day, only as far back as 1999 and 2000 I was working on Oracle Financial architectures running on dedicated SUN E10K with direct attached silo storage. Boy have we come a long way.
As always, comments welcome!