Cray ClusterStor L300 - 16.3.9 Cable AMMU Networks

Figure 77. Cabling SSU ESU SAS 12Gb (SSU + 2)
11 2 2
1
1
3
4 5
2
2
11 2 2
1
1
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4 5
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2
EBOD 0 EBOD 1
EAC 0 EAC 1
SSU+2
ESU 1
EBOD 0 EBOD 1
ESU 2
0 1 2
0 1 2
0 1 2
0 1 2
16.3.9
Cable AMMU Networks
The Lustre Distributed Namespace (DNE) feature. The optional additional MMU hardware adds the additional
MDS/MDT capability to a ClusterStor L300 and L300N file system.
The additional optional MMU is deployed as a single 2U24 enclosure containing:
● 2 x MMU EACs (embedded application controllers)
● 22 x 10K HDDs
● 2 x standard 2U24 power supply/fan modules
Each MMU provides two Lustre metadata servers (MDS), one running on each of the 2 MMU EACs and operating
together as an HA failover pair. Normally, each MDS owns and operates 1 of the 2 MDTs provided by the MMU;
during failover the surviving MDS owns and operates both of the 2 MDTs.
Each MDT is provisioned as a single RAID 10 (5+5) array, using a total of 20 HDDs with the remaining 2 HDDs
configured as global hot spares. A single ClusterStor L300 and L300N file system cluster may have from 0 to 8
MMUs installed.
An MMU includes the following cables and connections when installed in a storage rack (occupying 2U of rack
space):
● 2 x power cable, 1 to each PDU
● 2 x LMN cable to each node = 4 total
● 1 x LDN cable to each node = 2 total
The switch port connections are:
Reference
118