student guide.pdf

Copyright © 2005 EMC Corporation. Do not Copy - All Rights Reserved.
Disk Director Adapter Crossover
Director
Adapter
Processor
d
A
B
A
A
Ports
Ports
c
A
B
B
B
Adapter port
crossover feature
b
A
B
A
A
a
A
B
B
B
Connects to disk
midplanes
© 2005 EMC Corporation. All rights reserved. Symmetrix Foundations - 16
In order for each processor to access disks in the Front Disk Midplane and Back Disk Midplane
(referred to as C and D Devices), it is clear that each processor needs a physical path to two
separate Disk Midplanes via two cables.
The back adapter crossover function will allow d processor port A and c processor port A to access
the same Disk Midplane, while d processor port B and c processor port B access another Disk
Midplane.
All A ports from processors a, b, c and d access a Front Disk Midplane. All B ports from
processors a, b, c and d access a Back Disk Midplane.
Symmetrix Foundations - 16