Dell has appointed a new man to lead its worldwide enterprise-solutions business, which includes servers, storage and networking products. Marius Haas will take over responsibilities for engineering, design, development and marketing of this unit’s products.

Like one of its chief rivals HP is doing, Dell is repositioning its enterprise business to provide end-to-end IT solutions to customers, as opposed to selling them just servers, just storage arrays or just networking switches. As president of enterprise solutions, Haas is now at the forefront of this effort.

Michael Dell, the company’s chairman and CEO, said Marius’ mix of business, operational and strategic expertise was a good fit to drive this end-to-end-IT strategy. “We’re rapidly building on the strength of our leading portfolio of servers, storage and networking, and Marius will help accelerate that journey.”

Haas comes to Dell from the global investment firm Kohlberg Kravis Roberts (KKR), prior to which he served as senior VP and worldwide general manager of HP’s networking division. Before taking charge of networking at HP, he served for four years as senior VP of strategy and corporate development at HP.

Other companies on Haas’ resume include Compaq and Intel Corp.

He is replacing Brad Anderson, who has led Dell’s enterprise business since 2005. The company said Anderson’s resignation was a personal choice, while he explained the decision by saying he had accomplished what he had set out to do.

Anderson played a key role in developing Dell’s portfolio of data center storage and networking products, including EqualLogic, Compellent and Force10 brands.

Dell had about 15% share of the worldwide server market by revenue in the first quarter of 2012, according to the latest assessment available from Gartner. It was behind HP and IBM, each of whom had about 28% market share, with IBM slightly in the lead.

Besides servers, Dell sells data center network switches into the enterprise space. They are branded as Force10, after the company Dell bought in 2011 to bolster its Ethernet networking offer.

Dell has not, however, reached the top-five vendors by market share in the Ethernet switch market, where one of its chief rivals HP has made major strides, with a first-quarter market share second only to Cisco (a very far second, to be fair).

HP’s market share in Ethernet switches by revenue was 8.3% in the first quarter of 2012, according to IDC. Cisco had about 65% of this market, with Alcatel-Lucent, Juniper and Huawei making up the rest of the top-five.

Another segment of the enterprise IT market where Dell does not make it into the top-five but a few of its major competitors for enterprise dollars do is IT operations management software. IBM is leading in this space with about 18% market share in 2011, followed by CA Technologies, BMC Software, Microsoft and HP.

Dell also has not become one of the top-five IT outsourcers. In this increasingly important segment of the enterprise IT market, IBM dominated with about 11% market share, followed by HP (6%), Fujitsu (4.5%), CSC (4%) and Accenture (3%), according to Gartner’s estimate of the market for 2011.

Dell had the sixth-largest market share in the disk storage market in the first quarter of 2012, according to Gartner. With about 8% market share, it was behind HP’s 9%, Hitachi’s 9.5%, IBM’s 11%, NetApp’s 13% and EMC’s 32.5%.