HealthTap said it raised $24 million of Series B financing in a deal led by Khosla Ventures and joined by existing investors Mayfield Fund and Mohr Davidow Ventures. Keith Rabois will join HealthTap’s board, and Vinod Khosla will join the board as an advisor.

Sagar Pushpala, a former operating partner with Khosla Ventures, was tapped to take over TSI Semiconductors as CEO. TSI was formerly known as Telefunken Semiconductors.

This morning First Read brings you news to tide you over the Easter period including the latest on global IT spend; the stock market rebound; PE conflict in China and which are the most tax-friendly states for business.

Debra Chrapaty has left her post as Zynga’s CIO to become the CEO of cloud-storage startup Nirvanix. But to get the company on track, the tech veteran may have to overcome morale issues first.

Keith Rabois, a serial operating executive who most recently resigned as the chief operating officer of the payments company Square, has joined the venture firm Khosla Ventures as a partner. Before joining Square, Rabois spent numerous years at LinkedIn, first as a vice president, then as an executive VP of strategy and business development. Earlier in his career, Rabois, who has a law degree, was also an executive VP focused on public policy at PayPal. He also spent a year as an entrepreneur-in-residence at Clarium Capital, the hedge fund run by PayPal cofounder Peter Thiel.

Total Energy Ventures, the corporate venture capital arm of French oil and gas producer Total SA, brought additional capital to a second closing of the US$37.3 million Series D financing of energy storage solutions provider LightSail Energy Inc. The deal’s first closing, which included Khosla Ventures, Bill Gates and Canadian venture capital firm Innovacorp, took place in late 2012. Founded in 2009, LightSail has its head office in Berkeley, California. The company operates in Canada through the Nova Scotia-based LightSail Canada Inc.

Big Switch Networks said that Intel Capital has joined the company’s Series B funding, bringing the total raised to date to over $45 million. Big Switch investors include Goldman Sachs, Index Ventures, Khosla Ventures and Redpoint Ventures. The company initially announced a Series B of $25 million in October with Redpoint leading the deal. It raised a Series A round of $14 million in 2011.

DB Networks said Wednesday that it has raised $4.5 million in Series B fund led by Khosla Ventures. Shirish Sathaye, a Khosla general partner, has joined DB Networks board. San Diego-based DB Networks provides database security equipment.

YuMe, a provider of digital brand advertising software and services, has acquired Crowd Science, an audience targeting technology company. YuMe is backed by Accel Partners, BV Capital, DAG Ventures, Intel Capital, Khosla Ventures, Menlo Ventures, Samsung Ventures, Translink Capital and WestSummit Capital.

After four years at BOKU, Ron Hirson, co-founder and president, has accepted the opportunity to be an Entrepreneur in Residence at two venture firms, Khosla Ventures and Mayfield Fund. During his tenure at BOKU, Hirson ran multiple executive functions ranging from marketing to business development, and helped build the original BOKU product.