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ISM v5 > Module 10: Data Protection (Data Replication) > Flashcards

Module 10: Data Protection (Data Replication) Flashcards

1
Q

What is data replication?

A

process of creating an exact copy of data to ensure business continuity

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2
Q

What is a source/production LUN?

A

LUNs that compute system access on production storage system

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3
Q

What is a target LUN?

A

LUN on which the production data is replicated

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4
Q

What is the reason to do replication instead of a normal backup?

A

normal backup places additional burden on prod infrastructure since LUNs are involved in prod/backup operations

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5
Q

What is local replication?

A

replicating data within the same location

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6
Q

What is remote replication?

A

replicating data to remote locations

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7
Q

What are snapshots?

A

virtual copy of a set of files, VMs or LUNs as they appeared at a specific point in time (PIT)

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8
Q

What is the benefit of snapshots?

A

can establish recovery points in a small fraction of time and reduce RPO

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9
Q

What is a VM Snapshot?

A

preserves the state and data of a VM at a specific PIT

includes power state of a VM and includes all files

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10
Q

What are storage system based snapshots?

A

provide space optimal pointer based virtual replication

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11
Q

How does a storage based snapshot work?

A

at time of replication session the snapshot contains pointers to the location of the data on the source

snapshot doesn’t contain any data - known as virtual replica

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12
Q

What is cloning?

A

provides the ability to create fully populated PIT copies of LUNs within a storage system or create a copy of an existing VM

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13
Q

How does cloning of a storage volume work?

A

initial synchronization is performed between the source LUN and clone - during synchronization clone is not available to servers

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14
Q

What is the existing VM called in a VM clone?

A

Parent VM

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15
Q

What is a full clone in VM cloning?

A

an independent copy of a VM that shares nothing with the parent VM

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16
Q

What is a linked clone in VM cloning?

A

created from a snapshot of the parent VM

17
Q

What is synchronous replication?

A

write is committed to both the source and remote replica before it is acknowledged to the compute system - zero RPO

18
Q

How does synchronous replication work?

A

write IO received from compute into cache of source

write IO transmitted to the cache of target storage

receipt acknowledgement provided by target back to source

source sends acknowledgement back to compute

19
Q

What is asynchronous replication?

A

write is committed to the source and immediately acknowledged by compute system

20
Q

How does asynchronous replication work?

A

write IO received from compute system into cache of source

receipt acknowledgement by source to compute

write IO transmitted to target cache

target sends acknowledgement back to host

21
Q

What is continuous data protection (CDP)?

A

provides the capability to restore data and VMs to any previous PIT

22
Q

What are the key components of CDP?

A

Journal Volume
CDP Appliance
Write Splitter

23
Q

How does CDP work?

A

data changes are continuously captured and stored at a separate location from the prod volume

24
Q

What is a journal volume?

A

contains all data that has changed from the time the replication session has started

amount of space that is configured for the journal determines how far back recovery points can go

25
Q

What is a CDP appliance?

A

intelligent hardware platform that runs the CDP software - manages both the local/remote replication

can also be a virtual appliance

26
Q

What is a write splitter?

A

intercepts writes to the production volume and splits each writes into two copies

27
Q

What is a replica?

A

an exact copy/image of your data within your storage environment

28
Q

What is a backup?

A

exact copy but off the storage array environment entirely

29
Q

What is local replication?

A

where we take a copy and put it in the same array as the source LUN

30
Q

How does local replication work?

A

going to create another LUN as same size as source in the same array

going to take full copy and mirror - will create PIT

can now allocate second LUN to separate server for read/writes

31
Q

What is virtual pointer based replication also called?

A

snapshots

32
Q

What is a pool of thick devices called to create snapshots from?

A

Save Pool

33
Q

What is the purpose of a save pool?

A

source of storage for pointer devices

ISM v5 (32 decks)

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