Firewire HDs vanish from Mac Pro

I have a series of hard drives connected to my Mac Pro via the rear Firewire 800 connection. This morning, they had all disappeared from the desktop. The connections appear to be fine: the drives all power off if they're not connected to the computer, and they all seem to be working (lights on, disks spinning as normal). Any ideas?

Reset the FW ports and bus; find a better make of FW cases; insure they have latest firmware for FW bridge chipset; check power adapters.
Series: too many and daisy chained; add PCIe FW800 (Sonnet, Aaxeon etc) or switch to native SATA.

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