PowerMax and VMAX All Flash Solutions Design (SRDF Initial Setup Operations)

Question 1

What does the symcfg list –ra all command do?

Answer 1

shows the remote adapters and ports used for both arrays

Question 2

What is the symsan command used for in SRDF?

Answer 2

to discover and display SRDF connectivity between the arrays

helps in situations where SRDF groups have not yet been created between the storage array pairs

Question 3

What is required to create the first Dynamic SRDF Group?

Answer 3

full serial number of the remote array

only last few digits of remote array needed for any subsequent groups

Question 4

What does the symrdf addgrp command do?

Answer 4

creates an empty Dynamic SRDF Group on the source and target arrays and logically links them

physical links and communication between arrays must exist for command to work

Question 5

What does the symcfg list -rdfg all command do?

Answer 5

outputs detailed information about the configured SRDF Groups

Question 6

What does the symrdf deletepair command do?

Answer 6

deletes SRDF pairs

must suspend SRDF links before issuing command

Question 7

What does the symrdf removegrp command do?

Answer 7

deletes SRDF Groups

group must be empty before being deleted

Question 8

What does the symrdf list pd command do?

Answer 8

outputs a list of all the SRDF devices accessible to the host

Question 9

What is the rule for running SYMCLI on SRDF?

Answer 9

when performing SRDF/S operations commands can be run for all devices in a group or subset

for SRDF/A operations the commands should be run for all devices in a group

Question 10

What is SRDF/AC?

Answer 10

adaptive copy

designed to transfer large amounts of data without loss of performance

Question 11

How does SRDF/AC work?

Answer 11

allows the R1 and R2 devices to be more than one IO out of synchronization

unlike asynchronous mode adaptive copy does not guarantee a dependent write consistent copy of data to R2 device

Question 12

What are Dell’s recommendation when using SRDF/AC?

Answer 12

use adaptive copy disk mode to transfer the bulk of you data to target devices

then switch to synchronous mode to ensure full data protection or asynchronous mode to ensure full data consistency

recommended since SRDF/AC can’t fully protect against data loss

Question 13

What is SRDF/Metro?

Answer 13

writes can be done to both sides of the device pair

data must be stored in cache on both sides before an acknowledgement is sent to the host that wrote the data

Question 14

What does the ymrdf set mode command do?

Answer 14

changes the SRDF operation mode