Jan 152011

Okay, so you tell me you need an EqualLogic iSCSI SAN SAS array. But do you really need a SAS array…? I mean, do you reeeeeeeally need a SAS array…? Let’s look at the facts and see if what you have and what you need match up…fair…?

There’s no doubt that you’ve heard that SAS is fast, right? Oh, yeah. In fact, EqualLogic SAS units are extremely fast and have been known (and documented) to even outperform their fibre channel counterparts. Take that, fibre channel!!!

The SAS EqualLogic iSCSI SAN units can come in 10K or 15K RPM drive speeds within the EqualLogic PS4000X, PS4000XV, PS6000X, PS6000XV, PS6010X and PS6010XV models. For the EqualLogic PS6500X and PS6510X models, only 10K RPM drive speeds are available…for now.

So, let’s take a look at what you have. Hmmm…you have some file data and maybe some Exchange and SQL. Yes, database applications are usually pretty demanding and may merit faster drive speeds…SAS would definitely do the trick…


Have you done a perfmon yet…? What’s a perfmon you might ask…? It stands for Performance Monitor (perfmon), and it’s a tool that helps you assess the (storage) traffic on your network. It’ll show you how many IOPS (Input/Output Operations Per Second) your network is pushing through, where your peak traffic times are and all that good stuff. Federal Appliance happens to coordinate these for free for our clients in an attempt to more accurately assess which EqualLogic iSCSI SAN you might need…whether it’s a SAS or a SATA.

Rule of thumb?

If your IOPS are more than 600 or so, you might want to consider a SAS unit. If it’s under this, you might be better off staying with a SATA unit. Why pay for more horsepower than your network really needs…? SAS does cost more…about 20% to 40%, on average, but if you don’t need it don’t buy it. I have plenty of clients running multiple database applications in their environment across an EqualLogic SATA unit…and it’s more than enough for them. Every client is different.

But there are other circumstances that might drive the need for an EqualLogic SAS unit over a SATA one…such as file size, imaging requirements, disaster recovery, replication needs, additional database applications, SAP implementations, ERP implementations, Oracle, DB2, clustering, future growth, and so on.

Still not sure with EqualLogic SAN is right for you…? Neither am I…heck, that’s why we need to talk. Now. Until we discuss your requirements and assess your traffic with a perfmon or some other network tool, we really won’t know for sure. But knowing what you need will help you build a business case for that EqualLogic SAN you’ve always wanted. You know, that nice new EqualLogic PS6000XV-9.6TB array that those financial tightwads in upper management declined last year…? Well, now you’ve got ammo…so go ahead, buy that PS6000XV-9.6TB…we’ve got your back…