Datacentre Support Reference Guides

EMC: SRDF operations

 
 

 

  1. 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

  2. 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