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Dell Midrange Storage Solutions Design 2023 > Unity Design: Midrange Sizer for Unity > Flashcards

Unity Design: Midrange Sizer for Unity Flashcards

1
Q

What are the 6 inputs that should be gathered to properly size and design Unity?

A

server information

workload characterization

capacity

replication

tiering

skew

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2
Q

What makes up the server information in Unity sizing?

A

planned server consolidation

protocols

types of servers (physical/virtual)

OS

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3
Q

What makes up the workload characterization in Unity sizing?

A

IO type (block/file)

block size

IOPS

throughput

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4
Q

What makes up the capacity in Unity sizing?

A

current capacity

anticipated growth

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5
Q

What makes up the replication in Unity sizing?

A

requirement for local or remote replication

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6
Q

What makes up the skew in Unity sizing?

A

changing patterns of active data or hot blocks relative to overall storage capacity

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7
Q

What do maximum performance limits depend on for Unity sizing?

A

protocols used

IO size and mix

access pattern

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8
Q

What is the importance of performance limits in Unity sizing?

A

can help optimize in place systems and plan port capacity for proposed system

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9
Q

What is important to know about performance limits for Unity?

A

response times at the upper limits may be unacceptable because CPUs may be at saturation point

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10
Q

What information do you need to optimize port performance for Unity?

A

sustained per port IOPS (for small block mixed random workloads)

sustained per port MB/s (for large blocked mixed sequential workloads)

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11
Q

What are port utilization recommendations for Unity sizing?

A

use front end ports and cores for optimal performance

if iSCSI on Unity XT 380 - use CNA ports on system - can be used for iSCSI offload

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12
Q

What is the difference in port performance for Unity XT 380 vs higher models?

A

higher performing models have mezzanine cards instead of CNA ports

cards enable higher performance than CNA ports

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13
Q

What port load balancing features does Unity have?

A

multi-core architecture and port-to-core affinity

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14
Q

How is port-to-core affinity implemented in Unity?

A

associating IO ports with a core thereby load balancing port IO across multiple cores/maximizing system potential

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15
Q

What are the performance recommendations for port balancing on Unity?

A

configure system with as many front end ports as possible

if limited number of front end open switch ports use a single port

multi-core architecture optimizes configuration by a round robin load balancing across cores

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16
Q

What is the performance of a Unity with a one port switch to SAN configuration?

A

with workload from a single port running on one core due to port-to-core affinity CPU utilization stays at 80%

other cores in system spike one by one because they help in round robin load balancing

17
Q

What is the performance of a Unity with a four port switch to SAN configuration?

A

more cores are dedicated to handling IO from the additional ports - CPU utilization stays below 80%

18
Q

What is the performance of a Unity with a eight port switch to SAN configuration?

A

all the cores handle the IO - CPU utilization stay below 80% - maximum efficiency

19
Q

How do you assess if the drives are a bottleneck for Unity sizing?

A

check the sustained per drive IOPS

20
Q

What are the acceptable sustained per drive IOPS for each drive type assuming small block mixed random workloads?

A

NL-SAS - less than 150

SAS 10K - less than 250

SAS 15K - less than 350

SAS Flash - less than 20,000

21
Q

What might be the probable bottleneck/solution if the reported bandwidth on a solution is ~110MB/s and its multiples?

A

1GbE network port

use more ports/use 10GbE

22
Q

What might be the probable bottleneck/solution if the reported bandwidth on a solution is ~750MB/s and its multiples?

A

8Gb FC port

use more ports/use 16Gb FC

23
Q

What might be the probable bottleneck/solution if the reported bandwidth on a solution is ~1,100MB/s and its multiples?

A

10GbE network port

use more ports

24
Q

What might be the probable bottleneck/solution if the reported bandwidth on a solution is ~1,500MB/s and its multiples?

A

15Gb FC port

use more ports

25
Q

What might be the probable bottleneck/solution if the reported bandwidth on a solution is ~4,000MB/s and its multiples during writes?

A

1 SAS Bus

spread drives across more SAS buses

26
Q

What might be the probable bottleneck/solution if the reported bandwidth on a solution is ~10,500MB/s and its multiples during reads?

A

2 SAS Buses

Add a SAS IO Module for more SAS buses

27
Q

When should you switch a configuration from HFA to AFA?

A

if more than 50% flash capacity is needed

28
Q

What are the benefits of using an AFA vs HFA array?

A

less physical space required

lower power is consumed

less cooling is required

more cost effective if flash capacity over 50%

29
Q

What are the recommendations when sizing an HFA?

A

size flash + SAS to satisfy most workload requirements

keep minimum of 5% Flash and increase flash to hold active data set

30
Q

What Midrange Sizer option only supports hybrid dynamic pools?

A

System Designer

31
Q

What is Help Me Choose a Product feature in Midrange Sizer?

A

obtain guidance for product selection

32
Q

What is the Saved Configurations feature in Midrange Sizer?

A

view organize and share the saved configurations

33
Q

What is the Quick Configuration path in Midrange Sizer?

A

choose from predefined configurations that cater to specific requirements or use cases

34
Q

What are the two Midrange Sizer options you should use if you need to predict performance?

A

Quick Configuration

System Designer

35
Q

What are the two Midrange Sizer options you should use if a system needs to meet given performance requirements?

A

Application Oriented

Live Optics/NAR

Dell Midrange Storage Solutions Design 2023 (18 decks)

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