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There are two types of disk processor enclosures (DPEs). The disk processor enclosure can be either a 
3U 25 disk DPE, or a 3U 15 disk DPE. 
3U 25 Disk processor enclosure Front
0
12345678910 11 12 13 14 15 16 17 18 19 20 21 22 23 24
0
 1 X4
2
3
4
5
6Gb
SAS
8Gb
bre
 0 X4
6Gb SAS
A
2
3
4
5
6Gb
SAS
8Gb
bre
 0 X4
6Gb SAS
B
SP  B
SP  A
 1  X4
3U Disk processor enclosure Rear
0
1
2
3
0
1
2
3
0
1
2
3
0
1
2
3
3U 15 Disk processor enclosure Front
 VNX5300 DPEs