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Dynamic Vs Static SRDF Pairing

Dell EMC SRDF Pairing

Table of contents

  1. Dynamic SRDF Pairing
    1. Set dynamic bit for the source devices
    2. Set dynamic bit for the target devices
    3. Create a pair file
    4. Create pairing and Establish
    5. Query Pair
    6. SPLIT Pair
    7. Delete pair
  2. Static SRDF Pairing
    1. Create and Establish
    2. Delete Pairing

Dynamic SRDF Pairing

Details:

source array - 1234
Target array - 5678

source devices - a00,a01,a02
target devices - b00,b01,b02

dynamic rdf group for 1234 <=> 5678 is 50
( Created and controlled through EMC host-based SRDF software[ symcfg ], stored in Symmetrix cache.)

1

Set dynamic bit for the source devices

Run the below symconfigure script in 1234
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set dev A00 attribute=dyn_rdf;
set dev A01 attribute=dyn_rdf;
set dev A02 attribute=dyn_rdf;
2

Set dynamic bit for the target devices

Run the below symconfigure script in 5678
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set dev B00 attribute=dyn_rdf;
set dev B01 attribute=dyn_rdf;
set dev B02 attribute=dyn_rdf;
3

Create a pair file , pair_1234_to_5678_Dg50.txt as below

a00   b00
a01   b01
a02   b02

4

Create Pair and Establish

Create the SRDF pairing between source and target devices and start a full copy from R1 to R2.
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symrdf -sid 1234 -rdfg 50 -type rdf1 -file pair_1234_to_5678_Dg50.txt createpair -establish
5

QUERY Pair

You can query pair to know the status by using below command.
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symrdf -sid 1234 -rdfg 50 -file pair_1234_to_5678_Dg50.txt query
6

SPLIT Pair

Split pairs using the following command to make both R1 and R2 RW(ReadWrite).
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symrdf -sid 1234 -rdfg 50 -file pair_1234_to_5678_Dg50.txt split
7

Delete Pair

Once devices are in split state, we can delete the relation and make them as STD(Standard) devices.
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symrdf -sid 1234 -rdfg 50 -file pair_1234_to_5678_Dg50.txt deletepair


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Static SRDF Pairing


Details:

source array - 1234
Target array - 5678

source devices - a00,a01,a02 ( RAID-5 devices )
target devices - b00,b01,b02 ( RAID-5 devices )

rdf group for 1234 <=> 5678 is 1
(Created through bin file)

1

Create and Establish

Run below symconfigure script in 1234 to make the devices as SRDF Paired.
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convert dev a00 to RDF1+R5 ra_group=1 , remote_dev=b00 , invalidate=R2 , start_copy=YES;
convert dev a01 to RDF1+R5 ra_group=1 , remote_dev=b01 , invalidate=R2 , start_copy=YES;
convert dev a02 to RDF1+R5 ra_group=1 , remote_dev=b02 , invalidate=R2 , start_copy=YES;
2

Delete Pairing

Use following commands to delete the pair and make them STD Devices.
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convert dev a00 to RAID-5;
convert dev a01 to RAID-5;
convert dev a02 to RAID-5;