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Dell Midrange Storage Solutions Design 2023 > Powerstore Whitepapers > Flashcards

Powerstore Whitepapers Flashcards

1
Q

What are the maximum storage drives in a Powerstore 500T?

A

97

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2
Q

What are the maximum storage drives in a Powerstore 1200T or higher?

A

93

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3
Q

What are the 4 port cards supported by Powerstore 500T?

A

25/10 GbE optical/SFP+ and Twinax

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4
Q

What are the 4 port cards supported by Powerstore 1200T or higher?

A

25/10 GbE optical/SFP+ and Twinax / 10GbE BASE-T

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5
Q

What is the 2 port card included on Powerstore 500T?

A

10GbE optical/SFP+

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6
Q

What is the 2 port card included on Powerstore 1200T or higher?

A

100GbE QSFP

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7
Q

What are the optional 2 port IO Modules supported by Powerstore 500T?

A

32/16/8/4Gb FC

25/10GbE optical/SFP+
10GbE BASE-T

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8
Q

What are ports ports 2 and 3 for on the Powerstore 500T 4 port card?

A

NVMe expansion enclosures

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9
Q

What is the 2 port card reserved for on Powerstore 1200T and higher?

A

back-end connectivity to NVMe expansion enclosure

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10
Q

What are the optional 2 port IO Modules supported by Powerstore 1200T or higher?

A

32/16/8/4Gb FC

100GbE optical QSFP
25/10GbE optical/SFP+
10GbE BASE-T

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11
Q

How many optional 2 port IO modules are included when adding them to Powerstore?

A

2 per node

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12
Q

What is the 1GbE BASE-T ports used for in Powerstore?

A

service/management

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13
Q

What is the minimum drive count for Powerstore 3200Q?

A

11 NVMe QLC drives

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14
Q

What is the minimum drive count for Powerstore T models?

A

6 NVMe SSD/SCM drives

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15
Q

What is not supported by all SCM Powerstore base enclosures?

A

NVMe expansion enclosures

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16
Q

What is the M.2 SATA drives used for in Powerstore?

A

primary boot device for each node

stores base OS/log files/general operations

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17
Q

What is the function of the BBU in Powerstore 1200T and higher?

A

provides power to the NVRAM drive slots

allows NVRAM drives to vault their data in event of power failure

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18
Q

What is the 2 port card necessary for in Powerstore 1200T and higher?

A

to connect NVMe expansion enclosures

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19
Q

What is true about the optional IO modules in Powerstore?

A

for the two nodes in the base enclosure the IO modules must match between them

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20
Q

What power is supported by Powerstore models 1200-9200T?

A

1800/2100W (1200-5200T)
2100W (9200T only)

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21
Q

What is important to know about power configurations with Powerstore?

A

1800PSU can’t work in low-line power environments

can instead use 2100PSU w/ step-up transformer

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22
Q

What is the difference in M.2 SATA drives in Powerstore 500T?

A

only has one instead of 2

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23
Q

What is the function of the BBU in Powerstore 500T?

A

allows node to encrypt and backup dirty cache data from system DRAM to internal M.2

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24
Q

What power is supported by Powerstore models 500T?

A

1450W PSU

either high-line or low-line

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25
Q

What the minimum IO module/network is necessary to run NVMe/TCP?

A

25GbE

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26
Q

What the minimum IO module/network is necessary to run NVMe/FC?

A

32Gb

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27
Q

What is the recommendation for host connectivity in a Powerstore cluster?

A

any host connected to a Powerstore cluster should have equivalent connectivity to all appliances in a cluster

each host should have at least two paths to each Powerstore node (4 paths to appliance - no more than 8 paths to a volume)

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28
Q

What is true about NVMe/TCP connectivity in Powerstore?

A

can be enabled on the same storage network as iSCSI or different storage networks to isolate iSCSI from NVMe/TCP traffic

use different physical ports for NAS and NVMe/TCP if in unified mode

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29
Q

What is FSN (fail safe networking) in Powerstore?

A

high availability feature that enables configuring ports in a primary/backup configuration for file interfaces

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30
Q

What is dynamic node affinity in Powerstore?

A

block storage resources will be dynamically rebalanced between nodes to maintain relatively consistent utilization and performance between both nodes

vVols also become supported by dynamic node affinity in 4.0

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31
Q

What is the default performance policy for block resources in Powerstore?

A

medium - does not have any impact on system behavior unless some volumes have been set to low and others to high/medium

will dedicate less resources to low performance labeled volumed in times of high use

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32
Q

What were the QoS features introduced in Powerstore 4.0?

A

I/O limit rules for volumes and volume groups

33
Q

What are the supported resources for native synchronous and asynchronous replication in Powerstore?

A

volumes
volume groups
thin clones
NAS Servers
file systems

34
Q

What is the network used for native synchronous and asynchronous replication in Powerstore?

A

iSCSI or Dell optimized TCP based protocols

35
Q

What is the latency requirements for native synchronous replication in Powerstore?

A

less than 5ms

36
Q

What is metro volume replication in Powerstore?

A

synchronous replication of spanned block storage volumes exclusively for VMWare VMFS datastores

37
Q

What was added to metro volume replication in Powerstore 4.0?

A

volume group support

Windows and Linux support

38
Q

What is the secure snapshot setting in Powerstore?

A

create snapshots for volumes and volume groups

protects snapshot from deletion until the retention period expires

39
Q

What is Powerstore Storage Direct?

A

users can back up volumes and volume groups directly to a DD running on premise or in the cloud

eliminates need for backup hosts

40
Q

What was the network feature of Powerstore 4.0 added?

A

allows users to create multiple storage networks with defined purposes

41
Q

How do writes work in Powerstore 1200-9200T?

A

IO enters node A and saved within node DRAM memory and analyzed to determine what type of IO it is

information stored within write cache in Node DRAM memory

copy of write written to NVRAM drives

information (token) passed between the nodes to update the peer that a new write was received

IO acknowledgement completed to host - data passed through dedupe and compression at a later time

42
Q

How do writes work in Powerstore 500T?

A

write enters node A and information stored within node DRAM memory

information mirrored to peer Node DRAM memory

host acknowledged and data passed through dedupe/compression at a later time

43
Q

When does dedupe and compression occur in Powerstore?

A

as data is copied from DRAM memory write cache to the data drives within the system

44
Q

How is data stored in backend drives in Powerstore?

A

full stripe writes

45
Q

How is the data path through the data reduction algorithm in Powerstore?

A

first passes through common pattern detection (zeros)

than passed through dedupe algorithm

creates 4KB block fingerprint of data - compared to other fingerprints to see if any repeats

data compressed and placed into full stripe width in backend storage

46
Q

What is the role of metadata in the data reduction algorithm in Powerstore?

A

tells the system how to recreate or locate the data for an address

47
Q

What was the new compression feature added to Powerstore 4.0?

A

compression algorithm has been enhanced to allow multiple blocks of data to be compressed together

48
Q

Where is space savings information available in Powerstore?

A

cluster, appliance and drive level

49
Q

What are the data reduction viewing metrics that were added to Powerstore Manager after Powerstore 4.0?

A

Overall DRR
Reducible DRR
Unreducible Data

50
Q

What is Overall DRR in Powerstore Manager?

A

ration of space which would have been taken if dedupe and compression are not applied to the physical space

51
Q

What is Reducible DRR in Powerstore Manager?

A

DRR for the reducible data in the cluster/appliance/drive

52
Q

What is Unreducible Data in Powerstore Manager?

A

amount of data written that could not be reduced by Powerstore

53
Q

What replication feature was added to Powerstore during 4.0?

A

synchronous block AND file replication

54
Q

What file resources are supported for native migration in Powerstore?

A

NFS/SMB file systems

supports VNX2/Unity as source systems

55
Q

What block resources are supported for native migration in Powerstore?

A

LUNs/volumes
thick/thin clones
consistency groups
VMFS datastores (EqualLogic only)
Windows RDM (EqualLogic only)

56
Q

What is LVM migration in Powerstore?

A

supports block devices that have been presented to Linux hosts as logical devices

can be performed over iSCSI or FC

57
Q

What are the file migration options in Powerstore?

A

EMCopy
Robocopy
Rsync
Datadobi

58
Q

How are new NAS Servers assigned in Powerstore?

A

round-robin across available nodes

59
Q

Where are all NAS server interfaces configured?

A

first two bonded ports on 4 port card

use VTL w/ LACP to maximum bandwidth on these ports

60
Q

How much data is allocated for metadata in Powerstore file systems?

A

1.5GB

61
Q

What are user quotas in Powerstore file data?

A

limit the amount of space a user can consume on a file system

62
Q

What are tree quotas in Powerstore file data?

A

limit the max size of a directory on a file system

63
Q

What type of file backup does Powerstore support?

A

three way NDMP

transfers both metadata and backup data over network

64
Q

What additional protection feature does Powerstore have for file data protection?

A

FLR

65
Q

What are the latency independent replication options in Powerstore?

A

Block asynchronous
vVol asynchronous
File asynchronous

66
Q

What are the latency dependent replication options in Powerstore?

A

Block Metro synchronous
Block synchronous
File synchronous

67
Q

What is the replication limit for Powerstore?

A

supports up to 8 remote system pairs

68
Q

Where is replication typically performed on Powerstore?

A

over Ethernet ports

69
Q

What is required for the network if you’re doing file replication in Powerstore?

A

configure an additional file mobility network

70
Q

What is a limitation to synchronous metro replication in Powerstore?

A

limited to block only

71
Q

What are the replication topologies for native replication on Powerstore?

A

one-directional
bi-directional
one-to-many
many-to-one

72
Q

What is the host connectivity support for metro volumes?

A

ESXi FC or iSCSI

73
Q

What kind of replication is enabled when using metro volumes?

A

synchronous block bi-directional replication

74
Q

What change was made to metro volumes after Powerstore 4.0?

A

not just VMWare but now supports Microsoft and Linux as well

75
Q

What is the parity level required for Powerstore 3200Q DRE?

A

dual drive parity

76
Q

What is the only drive size for Powerstore 3200Q?

A

15.36TB QLC SSD

77
Q

What is distributed sparing in DRE?

A

spare space distributed across entire appliance - small chunk of data reserved in each drive

single drive’s worth of spare space reserved for every resiliency set in an appliance

78
Q

What makes distributed sparing more efficient than traditional hot spares?

A

when a drive fails only the portion of the drive which has data written will be rebuilt

spares only consume the required space

79
Q

What are resiliency sets in DRE?

A

failure domains within a set of drives

max of 25 drives in a set for single drive failure and 50 drives for dual drive failure

Dell Midrange Storage Solutions Design 2023 (18 decks)

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