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SRDF Commands


The following are SRDF Commands and what they are used for.

Composite SRDF commands

1. Failover:
1. Actions:
1. Write disables (WD) R1
2. Sets link to Not Ready (NR)
3. Write enables R2
2. Command:

symrdf -g ${group} failover

2. Update: Helps to speed up the failback operation by copying invalid tracks before write disabling any disks.
1. Actions:
1. Leaves service state as is.
2. Merges the tracks
3. Copies invalid tracks
2. Command:

symrdf -g ${group} update

3. Failback:
1. Actions:
1. Write disables R2
2. Suspends RDF link
3. Merges the disk tracks.
4. Resumes the link
5. Write enables R1
6. Copies the changed data
2. Command:

symrdf -g ${group} failback

4. Split: Leaves both R1 & R2 in write enabled state.
1. Actions:
1. Suspends the rdf link.
2. Write enables R2
2. Command:

symrdf -g ${group} split

5. Establish:
1. Actions:
1. Write disables R2
2. Suspends the rdf link
3. Copies data from R1 to R2
4. Resumes the rdf link.
2. Command:

symrdf -g ${group} [ -full ] establish

6. Restore: Copies data from R2 to R1
1. Actions:
1. Write disables both R1 & R2
2. Suspends the rdf link.
3. Merges the track tables
4. Resumes the rdf link.
5. Write enables R1
2. Command:

symrdf -g ${group} [ -full ] restore

Singular SRDF commands
1. Suspend: symrdf -g ${group} suspend
2. Resume: symrdf -g ${group} resume
3. Set mode: symrdf -g ${group} set mode sync
symrdf -g ${group} set domino on
symrdf -g ${group} set acp_disk skew 1000

  • Giuseppe Monardo

    I suppose the best evolution on SRDF (star configuration or async configuration) it the recent mode to add device in a device group (or STAR consistency group) with the command “symstar -cg CG_name modifycg -add -sid”. In “two sites” configuration, You can use the “-cons_exempt -nowd” option for the same reason. Maybe not everyone knows this operation ! It’s a big foot ahead in my opinion for EMC users. Bye
    Monardo G.A.