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Dell Midrange Storage Solutions Design 2023 > Midrange Storage Performance Planning: Performance Essential Guidelines > Flashcards

Midrange Storage Performance Planning: Performance Essential Guidelines Flashcards

1
Q

What type of processors do Unity XT use?

A

Intel

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1
Q

What are the rules for storage performance?

A

Maximize flash drive capacity (Unity XT)
Distribute workloads
Simplify configuration
Design for resilience
Maintain the System OE updated to latest release

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2
Q

What is the maximum core count on Unity XT procs?

A

16

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3
Q

What type of flash is supported on Unity XT?

A

TLC

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4
Q

Why should you maximize flash capacity in hybrid Unitys?

A

the best way to harness flash is to ensure as much dataset as possible resides on the SSDs

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5
Q

What is the recommended flash drive capacity on Unity HFA?

A

minimum of 10% of pool capacity

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6
Q

What is necessary to achieve data reduction on a Unity HFA?

A

flash capacity must be equal to or exceed 10% of total

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7
Q

What size drives should you use for the flash pool in a Unity HFA?

A

always use the largest flash drives possible

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8
Q

What is the maximum flash drive capacity?

A

15.36TBs

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9
Q

Why should you use the largest flash drives possible when building a storage solution?

A

decreases total number of drives - cost

less drives typically means less performance

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10
Q

What is a drawback of higher flash capacity drives in a Unity HFA?

A

drive endurance is lower in terms of “writes per day” (WPD)

(use the drive size that balances capacity and IOPS)

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11
Q

What are the two shelves that come with Dell storage solutions?

A

DPE (Disk Processor Enclosure)
DAE (Disk Array Enclosure)

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12
Q

What are the restrictions on SAS-Flash 2 Drives?

A

supported for FAST Cache, multi-tiered or All-Flash pools

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13
Q

What are the restrictions on SAS-Flash 3 Drives?

A

supported for multi-tiered or All-Flash pools - can’t be used in FAST Cache implementations

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14
Q

What are the restrictions on SAS-Flash 4 Drives?

A

can only be used in All-Flash pools - cannot best used in FAST Cache implementations

in hybrid models only 7.68TB SAS-Flash 4 is supported

can be mixed w/ other SAS Flash drive types in a pool

can be used in the system drive slots

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15
Q

What isn’t supported by the AFA Unity?

A

FAST Cache

FAST VP

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16
Q

What is the rule for front end connectivity in configuring storage?

A

use all available front end ports symmetrically across storage processors

optimizes host-storage access

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17
Q

What is included on the Unity XT 380F DPE?

A

2 onboard Ethernet ports

2 CNA ports for FC/iSCSI on each SP

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18
Q

What is included on the Unity XT 480F and higher DPE?

A

4 port mezz-card on each SP

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19
Q

What do all Unity models have for front end connectivity?

A

2 slots per SP for option IO Modules

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20
Q

What is included on the Powerstore 500T DPE?

A

4 port Mezz-Card (Mezz 0) and 2 port-card (Mezz 1) per node

21
Q

What is included on the Powerstore 1200T and higher DPE?

A

4 Port mezz card on each node

22
Q

What doe all Powerstore models have for front end connectivity?

A

2 slots per node for option IO Modules

23
Q

What is the rule when configuring back-end connectivity?

A

spread all the flash drives across the available back-end buses and DAES

24
Q

What do all Unity models have for back end connectivity?

A

2 integrated -back end bus connections

25
Q

What is included on the Unity XT 480F and higher back-end connectivity?

A

additional 4 port SAS expansion IO module

26
Q

How do you expand a Powerstore system?

A

NVMe SSD expansion shelves

27
Q

What is included on the Powerstore 500T back-end connectivity?

A

4 port 25GbE mezz card w/ support for NVMe connectivity

28
Q

What is included on the Powerstore 1200T and higher back-end connectivity?

A

embedded module v2 and 100GbE 2 port card on Mezz 1

both cards connect to the ENS24 expansion enclosure that supports NVMe SSDs

29
Q

What are the rules for Unity XT workload building?

A

build storage pools with many drives to service the IO workload

distribute LUNs and NAS servers symmetrically across storage processors

30
Q

Why do you want to build storage pools with many drives to service the IO workload in Unity XT systems?

A

results in more spindles working concurrently to boost HFA performance

31
Q

What does Powerstore use to manage the drives?

A

Dynamic Resiliency Engine

32
Q

What is the benefit of Dynamic Resiliency Engine?

A

storage admin does not need to perform any manual drive configuration

all drives automatically used to provide capacity w/ improved resource utilization

33
Q

What does the dynamic node affinity do on Powerstore?

A

automatically rebalance block storage resources between nodes

defines appliance node to be used as active/optimized path for host IO

34
Q

How does the NAS server consume resources on Powerstore?

A

uses compute resources from one node on the Powerstore

35
Q

What happens if one node is busier than the other in Powerstore when NAS server is implemented?

A

must manually move NAS servers to the peer node to balance the workloads

36
Q

What are the recommendations to simplify Unity configurations?

A

fewer storage pools

standardize on single capacity drive

37
Q

Why are fewer storage pools recommended to simplify Unity configurations?

A

more drives can be devoted to any single workload to improve performance

38
Q

Why should you standardize on a single drive for Unity configurations?

A

reduce spare space reservation to build larger pools

greater flexibility for future reconfiguration

39
Q

What are the recommendations to simplify Powerstore configurations?

A

all drives be the same size to maximize usable capacity

40
Q

What are the minimum drive counts for Powerstore systems?

A

10 drives for single drive-failure

19 drives for double-drive failure

41
Q

What do both Unity and Powerstore come with to ensure resiliency?

A

redundant power supplies

redundant front/back end ports

redundant SPs

42
Q

How are storage pools configured in Unity?

A

RAID

43
Q

What does the RAID level determine in Unity XT?

A

performance characteristics and protection

44
Q

What does the strip width determine in Unity XT?

A

pool fault characteristics

45
Q

How do you replace a faulted drive in Unity XT?

A

dynamic pools (spare space reservation)

traditional pools (hot spares)

46
Q

How does DRE ensure resiliency on Powerstore?

A

groups the drives into resiliency sets to protect against drive failure

47
Q

How does DRE work?

A

spare space for rebuilds automatically distributed across all drives within each resiliency set

48
Q

What is the benefit of DRE?

A

enables faster rebuilds after drive failure

49
Q

What should you do before upgrading a Unity XT OS?

A

verify that the software update file is valid and not corrupt using SHA256 checksum

upgrade to latest drive firmware available

50
Q

How are Powerstore OS upgrades performed?

A

nondisruptive process

during parts of the upgrade process half of system hardware resources are unavailable

51
Q

What are the recommendations for Powerstore OS upgrades?

A

do it during planned maintenance windows

perform when its less busy to minimize the impact to clients

preupgrade health check should be run

Dell Midrange Storage Solutions Design 2023 (18 decks)

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