Slow boot up with fire drives attached

Hi,
I'm having problems if it I try and boot up my iMac, with 2 firewire drives and a drobo, one of the firewire drives is daisychained... I think that's the right term... through the drobo.
It tends to slow the boot time, it can be as much as 5 minutes.
Any ideas?

Hi,
Okay pending on how you want to look at this, I've got some good news and bad.
Good... When I booted up with the firewire drive on it's own attached, it was fine.
Bad, obviously it's a problem with the drobo... i think it's time for me to have a word with them... ~sighs~
Thanks. I'll keep this open and let you know how it ends up.

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