Site preparation for DataScale SN40L rack installation

When preparing a site for rack installation, ensure that the requirements for physical space, power, cooling, networking, and cabling are met.

1. Physical specifications for each DataScale SN40L rack

The physical specifications in this section help you prepare the site for your DataScale SN40L rack.

DataScale SN40L rack labeled with dimensions

Figure 1. DataScale SN40L measurements

Table 1. DataScale SN40L rack physical specification
Description	English	Metric
Height	78.5 in.	1,994 mm
Width	24 in.	610 mm
Depth	50 in.	1,270 mm
Packaged shipping height	88.5 in.	2,248 mm
Packaged shipping width	42 in.	1,067 mm
Packaged shipping depth	64 in.	1,626 mm

Table 2. DataScale SN40L rack required clearance
Description	English	Metric
Minimum clearance cabinet top to overhead infrastructure	24 in.	610 mm
Minimum clearance to front of rack for system installation and service	32 in.	812 mm
Minimum clearance at rack rear for service	24 in.	610 mm

Table 3. DataScale SN40L rack weight specification
Configuration	Weight		Shipping Weight
	English	Metric	English	Metric
DataScale SN40L 1 node	738 lbs.	335 kg	1038 lbs.	472 kg
DataScale SN40L 2 node	1056 lbs.	480 kg	1356 lbs.	616 kg

2. Power requirements

Power requirements depend on the specific rack you are installing. Your SambaNova representative will discuss power draw, facility power requirements, and grounding requirements when you fill out your site-specific forms.

3. Network requirements

The DataScale SN40L rack requires that the customer provides, manages, and maintains certain networks. This section describes these networks and what is required from the customer.

3.1. Network architecture and layout

The following networks are used within the DataScale SN40L rack:

Data network
Management
Access network

Some customers combine the management and access network.

Figure 2. Network topology diagram

The data network is a high-bandwidth (200/400 GbE) Ethernet network used for the RDUs and SN40L-H to take in data from an external source and for inter-RDU communication.

The management network is a 1GbE network used to log in to the DataScale SN40L rack components. This network connects to the baseboard management controller (BMC) of each component for power control, configuration, and monitoring/debugging, for other service operations. This network also connects to the SN40L-H operating system to support day-to-day user operations on the systems, as discussed in the DataScale SN40L rack system administration document. Day-to-day operations might include streaming logs, performing software updates, and performing other system administration tasks.

Customers can choose to partition the access switch using port-based VLANs to separate access to the management interfaces of the DataScale SN40L rack components and the SN40L-H OS interfaces. The customer is responsible for configuring this added network segregation. Alternatively, customers can leverage the high-bandwidth data network for user access to the systems.

These networks should typically be allocated a separate subnet to ensure the isolation of traffic, to regulate access to these networks.

3.2. Network infrastructure requirements

Ensure that network infrastructure is in place before starting installation.

Allocate a dedicated subnet and downlink for each network. To provide sufficient IP addressess for each of the networks, allocate:

A CIDR /26 subnet, or a subnet of 62 usable IP addresses, for the access network
A CIDR /27 subnet, or 30 usable IP addresses, for the data network.

The network architecture assumes that the first three IP addresses on each subnet are dedicated for redundant customer network infrastructure (for example, gateway VIP, switch failover IPs, and so on).

Provide three physical downlinks, two for the access network and one for the data network.

For the access network:
- One downlink for the access network connects directly to the access switch.
- The second downlink for the access network connects to the serial console server in the top of the DataScale SN40L rack.
The downlink for the data network connects to the data switch.

The high-bandwidth switch might require that the customer configure multiple connections using a network aggregation (LACP/LAG) group to provide the necessary level of bandwidth to and from the rack. By default, only a single port is configured as an uplink. The following table gives details for each network.

Table 4. DataScale SN40L rack infrastructure network requirements
Network	Switch	Uplink Port	Port Type
Data (/27)	Juniper QFX5130 data Ethernet switch (default)	31 4-port LAG of ports 27-30	QSFP-DD/QFSP-56
Access (/26)	Juniper 1G access switch	47	RJ45
Access (/26)	Serial console server	Dongle on left rear vertical bar of rack Labeled: SCS NET UPLINK	RJ45
Access (/26)	Access switch network management port	Dongle on left rear vertical bar of rack Labeled: ACCSW MGMT UPLINK	RJ45

To avoid spanning tree issues when initially connecting the rack to a customer network, do NOT plug in multiple uplinks from the data switch to the data network. Use only the single uplink on port 31 of the Juniper data switch initially. The default configuration of the switch has not been configured for the customer’s specific spanning tree configuration and multiple ports might lead to spanning tree issues. After local switch administrators have implemented proper local spanning tree configurations on the Juniper data switch, multiple uplinks can be used.

4. Datacenter network requirements

Before the delivery of the DataScale SN40L rack, ensure that the datacenter network and power cabling have been prepared.

Route the required network outlets from the datacenter network infrastructure to where the DataScale SN40L rack will be installed.
Ensure that the setup tasks described in Network requirements have been completed.

It is good practice to label the cables that are used to connect the two networks to the DataScale SN40L rack.

5. Power cabling requirements

Route the necessary power drops to where the DataScale SN40L rack will be installed.
Ensure the power drops meet the power requirements, socket type, and socket quantity described in Power requirements.