The open source OpenStack platform is seeing increased adoption in the enterprise and with that, the ecosystem of vendors around the platform is also growing. On the storage side, SwiftStack offers enterprises an OpenStack-based object storage service based on the Swift object storage platform.

Today, SwiftStack announced that it has raised a $16 million Series B round led by OpenView Venture Partners, a firm that specializes in working with B2B companies, with participation from existing investors Mayfield Fund, Storm Ventures and UMC Capital. This brings SwiftStack’s total funding after its $6.1 million round last year and previous seed investments to $23.6 million. The company says it grew 4x over the past year, despite the fact that it barely has a marketing or sales staff.