Filesystems, Disks and Memory

My ZFS on debian media server just died in a power outage, the zpool status shows this:
NAME STATE READ WRITE CKSUM
tank UNAVAIL 0 0 0 insufficient replicas
raidz1 UNAVAIL 0 0 0 corrupted data
sda ONLINE 0 0 0
sdb ONLINE 0 0 0
sdf ONLINE 0 0 0
sdh ONLINE 0 0 0
sdi ONLINE 0 0 0
sdk ONLINE 0 0 0
raidz1 DEGRADED 0 0 0
sdc ONLINE 0 0 0
sdd ONLINE 0 0 0
sde ONLINE 0 0 0
sdg ONLINE 0 0 0
sdj ONLINE 0 0 0
sdl UNAVAIL 0 0 0 cannot open

how come it failed with only one drive failure??

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That's odd. RAID-Z should be redundant -- it's essentially RAID 5.