Is a prison official liable under the Eighth Amendment for denying humane conditions of confinement?

"[A] prison official may be held liable under the Eighth Amendment for denying humane conditions of confinement only if he knows that inmates face a substantial risk of serious harm and disregards that risk by failing to take reasonable measures to abate it." Farmer, 511 U.S. at 847. The duty to protect a prisoner from serious harm requires that prison officials take reasonable measures to guarantee the safety and well being of the prisoner. Id. at 832-33; Frost v. Agnos, 152 F.3d 1124, 1128 (9th Cir. 1998). To sustain a failure to protect claim on summary judgment, the inmate must demonstrate that he was incarcerated under conditions posing a

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