During the past several years companies' storage needs exploded, while IT budgets all but imploded. Now that budgets are slowly increasing, companies are taking a long, microscopic look at the total cost of ownership (TCO) when purchasing new storage.

To calculate TCO, many people think that it's simply combining the purchase price and the cost of a multi-year support contract. Unfortunately, there is much more to it. So what does figuring TCO entail? There are several areas that should be included when determining TCO.

Initial Costs

The initial cost of a storage purchase sounds pretty straightforward; what is the cost of the disk? But today's storage solutions are far more complex than just disk. Budgets need to include hardware, software, services and support, as well as "environmentals."

Hardware: Calculating the cost of the actual storage is usually the easiest part of the TCO equation. Each server will need at least one HBA, as well as cables, etc. These may seem minor, but all these extras can easily add 10 to 20% onto a quote (depending on the amount of servers involved).

When purchasing switches, plan ahead. You may only need 12 ports today; but buying two 8-port switches, while very cheap, is not a smart idea if there are any plans for growth. Consider 16-port switches, or investigate switches that allow growth by adding blades of ports (4 or 8 at a time). Buying more initially may lower the cost of the hardware, and it may also lower the overall TCO of the solution.

Software: Five years ago, most storage systems didn't come with much software. Typically, there was a management tool and maybe a monitoring piece of software. Today, options like snapshots (pointer and full copy), replication (asynchronous and synchronous), HBA failover, and host agents, among others, are very common. Some of these options may seem expensive at first, but when the business impact is considered, it's a small price to pay. For example, as I mentioned, snapshot technology may add 10 to 20% to the initial cost of the storage purchase. But if implementing snapshots can be used to delay or eliminate the need to replace an existing tape library, then that extra cost is well spent.

Also, understand how storage software licenses work: some are tiered based on capacity, and some are tiered based on the number of servers, while others are not even tiered.

Services: Storage services range from installation to data migration to database tuning. Be sure to understand what is being purchased. "Installation" means something different to everyone. To the storage provider, it may mean just plugging the unit in and verifying that it works. The buyer may expect the works: configuration, host setup, etc. The difference in price can be extreme.

Request a detailed statement of work as part of the proposal and verify that your requirements are met. A poorly implemented solution will have a negative impact on the business and potentially raise the TCO.

Support: Storage solutions' support and service can cost a lot of money. No matter how much is spent, it will need to be serviced. Be certain to purchase the level of support necessary to protect your information, as well as its availability.

If the storage is being purchased for a 24X7 production environment, it should have 24X7 support with at least a four-hour response time. Keep in mind that if your system fails overnight and all you have is an "8-to-5" service contract with a four-hour response time, contractually, the service rep doesn't have to arrive on site until noon. That means your production environment could be down for a long time.

Also verify what level of software support is purchased. Some storage providers supply 90 days of software support for free. Then, on day 91, a bill shows up to cover the remaining year of support. All negotiation leverage is gone. Hardware and software contracts should be purchased up front for the expected life of the solution (for example, a three-year lease would call for a three-year support contract).

Environmentals: Many storage devices have specialized environmental requirements. Sometimes these requirements are overlooked and end up being a major cost. Will the existing air conditioning system support the addition of the new storage system? Is the correct power in place? Will the UPS or generator need to be upgraded? Can the floor support the additional weight of the unit? If the unit is oversized, will it fit in the elevator and through the datacenter doors? There have been occasions where a roof/ceiling has been opened and a crane used to lower a storage unit into a datacenter.

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Ongoing Costs

Once the solution is installed, configured and running, the costs listed above may continue to rise.

Hardware: Adding capacity to a storage system usually consists of purchasing disks and a tray to hold them. Additional servers will require additional HBAs, cables and more switch ports. Once the initial switch ports are full, some switches allow for blades of ports to be added. When these are all used, a decision needs to be made on whether to add more switches, which creates a more complex environment (possibly requiring a SAN evaluation to determine how to proceed) or replace the existing switches with larger ones, which is more expensive.