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L

13414

July 1st, 2005 18:00

Do I need another SCSI cable to add a HDD to 2850?

Hello,
 
We bought a stock PE 2850 with 2 73GB Ultra 320 80 Pin Drives.
 
As it stands, the Hard Drives are installed in bays 0 & 1 by Dell.  There is a 68 pin cable going from SCSI port A in the HDD bay area to the SCSI port A connected behind them on the side of the main chassis.
 
I want to buy a PERC4/ei kit, an additional HDD cage, and another Maxtor drive, so I can do RAID5.
 
My computer was shippedwith the 1x6 Hard Drive backplane.
 
If I connect another HDD (I'll put it in HDD bay 2), do I need to hook up another SCSI cable to port B in order for the system to detect it?  If I simply add another drive to the setup, is it going to be on the chain connected to port A?
 
Thanks in advance,
 
Brian
 
 

12 Posts

July 1st, 2005 21:00

Thank you for posting to my question...this really makes me more secure before ordering more equipment.
 
Thank You!
 
Brian

720 Posts

July 1st, 2005 21:00

Brian,

  It will always be seen on SCSI A in the third slot (ID2). The SCSI B connectors when connected to a SCSI or RAID controller changes the BP from a single channel with 6 drives, to a dual channel with 3 drives on each channel. SCSI A in 2x3 mode accesses ID 0, 1, and 2, and SCSI B accesses ID 3, 4, and 5. If only SCSI B is connected only ID 3,4, and 5 will be seen, if only SCSI A is connected all 6 drives are seen thru SCSI A.

warwizard DCSP

 

6 Posts

July 8th, 2005 18:00

I just ordered a 2850 and found a 15K scsi drive w/ 68 pins relatively cheap, elsewhere.  If I understand the first post, will it support both 80 pin and 68 pin drives without getting an adapter?

 

TIA

 

aj

6 Posts

July 8th, 2005 18:00

Also a quick edit....  Is there a performance hit going from 80 pin to 68 pin if I need to get an adapter?
 
aj

12 Posts

July 8th, 2005 18:00

As far as I can tell, you have to use 80 pin to use the exisiting backplane which only has 80 pin and no separate AC.
B

6 Posts

July 8th, 2005 18:00

Also a quick edit....  Is there a performance hit going from 80 pin to 68 pin if I need to get an adapter?
 
aj
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