In
PowerFlex, inter-node communication manages data locations, rebuild and rebalance, and access applications to stored data on one IP network, or on separate IP networks.
Use any of the management interfaces to perform management tasks in the following ways:
Through a separate network with access to the other
PowerFlex components
On the same network
Configure these options in the following ways:
During deployment in the full
PowerFlex Installer (using the CSV topology file) and using the VMware plug-in
After deployment with the CLI.
The following table includes the list of
PowerFlex networking requirements and supported architectures or configurations.
Table 1. Networking requirements and limitationsThe following table includes the list of
PowerFlex networking requirements and supported architectures or configurations.
PowerFlex minimum network requirements and supported architectures
IPv4 is supported on
PowerFlex appliance and
PowerFlex rack offerings.
DHCP must not be deployed on a network where
PowerFlex MDMs, SDS, SDR, or SDCs reside.
Firewall rules must allow
PowerFlex ports. For port information, see the
Dell
PowerFlex 4.6.x Security Configuration Guide.
The following table includes the list of
PowerFlex networking requirements and supported architectures for systems with replication.
Table 2. Networking requirements and limitations for systems with replicationThe following table includes the list of
PowerFlex networking requirements and supported architectures for systems with replication.
PowerFlex network requirements and supported architectures for systems with replication
PowerFlex network limits for systems with replication
Minimum best practice with replication: 4*25 GbE or 2*100 GbE
Additional IP addresses for site to site routing include:
Within a protection domain, SDRs are installed on the same hosts as SDSs. The traffic that an SDR writes to the journal volume, is sent to all SDSs that host the journal, not only the one that is co-located on the host. In the backend storage network, each SDR listens on the same node IP addresses as the SDSs and should be able to reach all SDSs within the protection domain.
The SDRs require additional, distinct IP addresses which allow them to communicate with remote SDRs. Usually, these should be routable addresses with a properly configured gateway. For redundancy, each SDR should have two.
Static routes:
PowerFlex asynchronous replication usually happens over a WAN between physically remote clusters that do not share the same address segments. If the default route itself is not suitable to properly direct packets to the remote SDR IP addresses, static routes must be configured to indicate either the next top address or the egress interface or both for reaching the remote subnet.
PowerFlex Manager can add static routes for replication use cases.
MDM to MDM peer metadata synchronization should take place over a WAN with less than 200-millisecond latency.
Local SDR to remote SDR: Latency is not as sensitive in SDR greater than SDR traffic, but round-trip time should not be greater than 200 milliseconds.
Firewall rules must allow
PowerFlex ports. For port information, see the
Dell
PowerFlex 4.6.x Security Configuration Guide.
See the following configuration guidelines used by
VxFlex Ready Node for example purposes only:
This section describes how to choose from these options, depending on the requirements of your organization, security considerations, performance needs, and IT environment.
PowerFlex networking considerations:
Single IP network: All communications and IOs used for management and for data storage are performed on the same IP network. This setup offers the following benefits:
Ease of use
Fewer IP addresses required
Multiple separate IP networks: Separate networks are used for management and for data storage, or separate networks are used within the data storage part of the system. This setup offers the following benefits:
Security
Redundancy
Performance
Separate IP roles in order to separate between customer data and internal management
NOTE:Network high availability can be implemented by using NIC-bonding (see
Dell PowerFlex Appliance and PowerFlex Rack with PowerFlex 4.x Cabling and Connectivity Guide) or by using several data networks in
PowerFlex.
For more information about MTU performance considerations and best practices, see the
Dell
PowerFlex 4.6.x Install and Upgrade Guide.
NOTE:The MDM cluster IP address limit is 16 IP addresses, which include all cluster members (primary, secondary, and standby).
Table 3. Range of potential IP address configurationsThe following table describes the range of potential IP address configurations:
Column in CSV file
MDM Management IP
MDM IP addresses
SDS all IP addresses
SDS-SDS only IP addresses
SDS-SDC only IP addresses
Comments
Management access
Control network
Rebuild and data path network
Rebuild network
Data path network
Optional, but recommended
This is not applicable for
tiebreaker IP addresses that can be used to provide access to
PowerFlex management applications, such as PowerFlex Manager, CLI, REST API, OpenStack.
This IP address must be externally accessible.
Mandatory IP addresses used for MDM control communications with SDSs and SDCs, used to convey data migration decisions, but no user data passes through the MDM.
Must be on the same network as the data network.
Must be externally accessible if no MDM Management IP addresses are used.
IP addresses used for both SDS-SDS and SDS-SDC communications.
These IP addresses will also be used to communicate with the MDM.
IP addresses used for SDS-SDS communication only.
These addresses are used for rebuild and rebalance operations.
These IP addresses will also be used to communicate with the MDM.
IP addresses used for SDS-SDC communication.
These addresses are only used for read/write user data operations.
The following combinations can be used for SDS or SDC:
Only
SDS All IPs
Only
SDS-SDS Only IPs +
SDS-SDC Only IPs
SDS All IPs + either
SDS-SDS Only IPs or
SDS-SDC Only IPs
(can be used in cases of multiple networks; ensure that you do not use the same IP address more than once in the networks).
SDS All IPs + both
SDS-SDS Only IPs and
SDS-SDC Only IPs (can be used in cases of multiple networks; ensure that you do not use the same IP address more than once in the networks).
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