System Design Guide for Dell PowerFlex family Flashcards
What is a benefit of two layer vs HCI build?
can help in lowering Enterprise Software licensing cost - only applied to compute nodes compared to HCI where it’s included in all the nodes
can make day 2 operations easier
allow external SDC nodes to connect to PowerFlex
How does data traffic work in an HCI build?
SDC to SDS (front end) and SDS to SDS (back end) data traffic runs on shared VLANs
How does deployment work in a hybrid build?
HCI nodes deployed separately from SO/CO nodes
recommendation is to have all homogenous nodes in the same PD to ensure consistent performance
How is storage consumed in a hybrid build?
SDCs in HC and CO nodes can consume storage from either or both PDs (HC or SO nodes)
How does ESXi deployment work on PowerFlex?
supported on HCI and CO nodes w/ full deployment and LCM through PFxM
How does non-ESXi deployment work on PowerFlex?
RHEL/CentOS/SUSE can be deployed on CO nodes through PFxM
customers responsible for providing OS Image (supported only deployment no LCM)
What is customer responsible for specifically to RHEL deployments on PowerFlex?
for configuring hypervisors such as KVM/THV on top of RHEL
What is included w/ PowerFlex Rack?
Smart PDUs
IPI
PFlex Management Controller
PFlex HW/SW
Networking
What OSs are supported specifically on PFlex Rack if using NVMe/TCP?
RHEL
ESXi
SLES
What is the minimum SO nodes for PFlex Rack?
4 SO nodes
How is networking built out in PFlex Rack?
each cabinet has redundant acc/agg or leaf/spine switches
pair are installed in first cabinet/configured in correct topology
if more than one cabinet exists the switches can be spread across or put in other cabinets
What vendors does PFlex Rack support?
Acc/Agg - Cisco and Dell
Leaf/Spine - Cisco
What is the support level on PFlex Rack?
guaranteed one call support
Release Certification Matrix upgrade of code upgrade to all components
What are the file node sizes on PowerFlex?
small - 2 x 12 cores
medium - 2 x 16 cores
large - 2 x 28 cores
19.2-76.8TB
128-256GB
What are the specs for NSX-T nodes?
2 x 14 cores
256GB
5 x 800GB SSD
6 x 25 GbE
PERC H755
What is the networking recommendation for all PFlex Rack builds?
select Leaf-Spine option (especially for high performance or greater scaling)
When can you use acc/agg networking topology in PFlex Rack builds?
when high performance/scalability aren’t big factors
when PDs are not crossing multiple pairs of ToRs
How are Access switches connected?
all nodes including management controller nodes connect to access switches
How many nodes can an access switch pair support?
24 nodes (1RU or 2RU)
physically 42U rack can only support 12 2U nodes
How are Aggregation Switches connected?
uplinks to customer’s core network (10/40/100Gbps) links
connect to acc switches using dual (100Gbps) uplinks
What is not supported by NSX-T nodes?
SDC and SDS traffic across it
What customer provided infrastructure is necessary for ESXi and Hyper-V deployments?
Windows Server 2016/2019
vCenter Server
What are the minimum requirements for customers that want to use their own switches for PowerFLex Appliance?
less than or equal to 1ms round trip time latency
min 4 x 25GbE SFP28 per node
min 2 x 100GbE QSFP28 uplinks per switch
Jumbo Frames
VLANs
802.1 VLAN Encapsulation
What is true about Partial Network Automation?
only available on PowerFlex Appliance
What is important to tell customers about partial network automation?
need to be aware of impact and need of peer-link bandwidth
switch peerlink bandwidth must be greater than or equal to uplink bandwidth (400G Peerlink bandwidth recommended)
What are the hardware components of the PFlex Management Controller?
controller nodes
management switches
software defined storage
system management software components
What are the controller nodes in the PFlex Management Controller?
based on PE Servers - use PFlex to provide a reliable and highly available storage cluster for the management plane
separate from the PFlex production nodes
What are the two configurations for controller nodes?
large
small
depends on compute/storage capacity
What are the management switches in PFlex Management Controller?
Cisco or Dell for OOB Management
What is the automation difference between Full and partial network automation?
PFxM automates server facing ports and node OS networking in FNA
PFxM automates node OS networking only in PNA
How does automation of server facing ports work in FNA?
once physical connection to OOB management/server facing ports - PFxM can assign IP address, bonding, port speed, port changes etc.
How does automation of OS networking work?
OS network = VMkernel, port groups, distributed switches, VLANs etc.
When would a customer be capable of deploying their own network for PowerFlex?
proficient in configuring networks
have access to network experts
must comply with specific security measures outside of PowerFlex’s best practices
How much space is reserved in PowerFlex Rack for nodes?
28RU
How much space is reserved in PowerFlex Rack for support shelves?
1RU support shelf reserved for every 8RU used for equipment
What is the sizing rule for CO nodes running ESXi?
2 node minimum per CO service in PFxM
What is the rule w/ Intel and AMD CO nodes in an ESXi environment?
can’t mix since vMotion will fail when crossing between Intel and AMD
What is the formula to calculate the number of nodes you can house in a PowerFlex rack cabinet?
1.125 * X + 2.25 * Y <= 28
Where
X = # of 1 RU nodes
Y = # of 2 RU nodes
What is the compatability between PFlex Appliance and other offerings?
must only use PFlex appliance nodes within appliance systems
Rack Nodes and ready nodes not compatible and not supported by appliance systems
What does it mean when PDs should be homogenous?
Node Type (SO/HC)
Disk type (SAS, SATA, NVMe)
Disk count (number of disks)
Disk size (GB)
What is the storage controller in SO and HC nodes?
HBA355
specifically for SSDs
What is the available power option on PowerFlex?
DC
What is a networking limitation of PowerFlex?
can’t mix network vendors in a single node
What is important to know about using NVMe drives?
dual CPU nodes required
What is important to know about using NVDIMMs?
Can be supported in single CPU nodes
Why is R840 not used for SO nodes?
quad CPU would be of no benefit since SO nodes service no compute
What OS must all SO nodes be running?
RHEL or Embedded PFlex OS
What software components do file nodes have?
FSN and SDC
How much RAM should you have for SO nodes over 51.5TBs?
32GB NVDIMM
56GB RAM
How much RAM should you have for SO nodes between 51.5 - 96TBs?
64GB NVDIMM
56-73GB RAM
How much RAM should you have for SO nodes between 96-128TBs?
96GB NVDIMM
90GB RAM
How much RAM does the MDM take?
5.4GB
How much memory does the OS take up in SO nodes?
1GB
What are the components of the Intelligent Physical Infrastructure (IPI)?
Smart PDUs
Physical Cabinets
Access Controls
Associated Cables
What are Smart PDUs?
work in parrallel w/ v4.5 cabinets
PDU connections to the IPI are pre-cabled w/ the v4.5 cabinet and power data is accessible through the IPI GUI
How can Smart PDUs be mounted?
whip up or whip down configurations
How are Smart PDUs/racks connected?
single Cat 5/6 connection and single IP address to the management switch
up to 3 pairs of PDUs
What are the dimensions on v4.5 racks?
27in wide
47 in deep
How many PDUs can go in a cabinet in PowerFlex Rack?
2-6
How many outlets per PDU?
36 - 24 10amp - 12 16amp
What are the hardware components of the PowerFlex Management Controller?
PFlex Rack Management Controller Nodes
NSX-T Edge Node
Management Switch
What are PFlex Rack Management Controller Nodes?
PowerEdge servers designed to provide compute power/storage capacity to run software components of PFlex Rack management
What are management switches connected to?
controller nodes
PFlex Nodes
NSX-T edge nodes
IPI v4.5 and PDUs
What is the management switch used by PowerFlex Rack in Cisco configurations?
Cisco 9238GC-X
1G
one recommended per rack
How many management switches should you have for 4-32 nodes?
1
How many management switches should you have for 33-78 nodes?
2
How many management switches should you have for 79-123 nodes?
3
How many management switches should you have for 123 and over nodes?
add 1 more switch every 45 nodes
Why can the first management switch only support up to 32 nodes?
since it’s partially consumed by management controller nodes, IPI appliance, PDUs, and customer uplink
What is the main benefit of having an OOB management network?
you can still access a switch even if a part of the network between you and the switch goes down
How are management switches connected?
one cable from the management switch to each device on the network to be managed
connected to OOB ports on switches
connected to iDRAC ports on servers
What is the management switch used by PowerFlex Rack in Dell configurations?
S4148T
What is the management controller requirement for PowerFlex appliance configurations?
single management node based on R650/640
multiple drives paired to internal RAID controller for redundancy
What is the general network setup in PowerFlex Rack for ToR Switches?
2 in each rack
can support up to 24 nodes and controllers
What are the standard connections for PowerFlex Rack nodes?
5
first 4 connected to ToR (access/leaf) via DAC (25G) or AOC (100G) cables
last connection to the management switch
What are the standard connections for PowerFlex Rack Management Controller?
6
first 4 connected to ToR (access/leaf) via DAC (25G) or AOC (100G) cables
last 2 connection to the management switch