This cost-effective service helps you minimize system downtime due to hardware failure. It features a commitment to resolve hardware problems within 6 hours from the time your service call is received. When you experience system problems, your call is immediately connected to an HP-certified resolution engineer for troubleshooting. If your problem cannot be resolved remotely, an experienced support professional is dispatched to your site to begin hardware repair & restoration activities. Choose 6-Hour Call-to-Repair support when you need to: be confident of system restoration within the shortest possible timeframe, boost productivity via increased hardware system uptime, obtain easy-to-buy, easy-to-use extended warranty services, & enhance IT resource planning & IT staff efficiency. Compatible with:- HP Storage Works Modular Smart Array 20 (335921-B21) HP Storage Works Modular Smart Array 20 (366172-B21) HP Storage Works Modular Smart Array 30 (302969-B21) HP Storage Works Modular Smart Array 30 (302970-B21) HP Storage Works Modular Smart Array Enclosure (364430-B21)