EMC VNX5300 - Interleaved Cabling with Seven DAEs in a VNX5300 Block Platform

EMC® VNX5300™ Hardware Information Guide
78
EMC® VNX5300™ Hardware Information Guide
Interleaved cabling
with seven DAEs in a
VNX5300 Block
platform
Figure 72 on page 79 shows a second example of a VNX5300 Block platform with
seven DAEs (all are 3U, 15 disk drive DAEs) or a VNX5300 platform with a total of
120 disk drives (with the DPE a 3U, 15 disk drive device).
In this example, as described previously, the SAS ports on the VNX5300 platform
DPE are labeled 0 and 1. SAS 0 is connected internally to the SAS expander that
connects to the internal DPE disks. However, since there are seven DAEs for a
maximum of 120 disk drives, it is recommended that the DAEs be load balanced. To
do this, it is recommended that you daisy-chain the DAEs for the most efficient load
balancing. So, in Figure 72 on page 79, there are two buses (Bus 0 and Bus 1).
The cables shown in Figure 72 on page 79 are:
Note: The cable colors shown in the example are orange for Bus 0 and blue for Bus 1.
◆ Cable 1, blue, DPE to 1
st
DAE (labels SP A SAS 1 to LCC A)
◆ Cable 2, blue, DPE to 1
st
DAE (labels SP B SAS 1 to LCC B)
◆ Cable 3, orange, DPE to 2
nd
DAE (labels SP A SAS 0 to LCC A)
◆ Cable 4, orange, DPE to 2
nd
DAE (labels SP B SAS 0 to LCC B)
The remaining cables are daisy-chained for load balancing. So, the blue cable for
Bus 1 is interleaved and daisy-chained through the remaining DAEs:
◆ EA 1/Bus 1
◆ EA 2/Bus 1
◆ EA 3/Bus 1
While the orange cable for Bus 0 is interleaved and daisy-chained through the
remaining DAEs:
◆ EA 2/Bus 0
◆ EA 3/Bus 0
Note: Figure 72 on page 79 shows 4U of reserved space to allow for upgrading your VNX5300
Block to VNX5300 File/Unified platform. If you might be planning to upgrade your Block
platform to a File/Unified platform, it is recommended that at least 4U of rack space be
reserved for adding one to two Controls Stations and one Data Mover enclosure.