Hello all. Can anyone here direct me to a good forum where I can get some questions answered on connecting a RAID chassis to a PowerMac G5? Thanks a lot.

Apple has their own forums which can be very helpful. Here's the forum for extending the G5:

http://discussions.apple.com/forum.jspa?forumID=593

Tim, the problem with those Apple discussion forums is that it can seem like amateur hour, and finding anything of value can take forever. If you have a G5 Power Mac and want to add some sort of external RAID capability, the two places I'd start reading about options, adapter cards and external enclosures are Barefeats and AMUG:

http://barefeats.com/

http://www.amug.org/amug-web/html/amug/reviews/reviews.html

If you already have "a RAID chassis" and are looking for the most experienced users online, outside of our Mac home theater-specific group here, the smartest Mac users hang at Ars Technica:

http://episteme.arstechnica.com/eve/ubb.x/a/frm/f/8300945231

Storage and RAID options over there are usually discussed in a hardware sub forum, it isn't platform distinct but often has knowledgeable folks and excellent advice:

http://episteme.arstechnica.com/eve/forums/a/frm/f/24609792

Good luck...

If it's a SCSI RAID, ATTO makes the best Mac compatible HBA (Host Bus Adapter) cards. There are cheaper options out there, but I use an ATTO UL4D (Ultra320) card in my Power Mac G4 content server.

ATTO's website is www.attotech.com

Careful not to get sticker shock!!

For more reasonable prices and with more RAID settings (i.e. 3 & 5) are the HighPoint (http://www.hptmac.com/US/index.htm) SATA RAID cards for your G5 try PCI-X (http://www.hptmac.com/US/categories.php?compatibility=2) or PCIe (http://www.hptmac.com/US/categories.php?compatibility=3). But, be sure to check Leopard compatiblity--my 1820A (http://www.hptmac.com/US/product.php?_index=11) is not.