EMC: SRDF operations

Title:

EMC: SRDF operations

Author:

Douglas O’Leary <dkoleary@olearycomputers.com>

Description:

EMC: SRDF operations

Date created:

06/2001

Date updated:

07/2005

Disclaimer:

Standard: Use the information that follows at your own risk. If you screw up a system, don’t blame it on me…

• Composite SRDF commands

  • Failover:

    • Actions:

      • Write disables (WD) R1

      • Sets link to Not Ready (NR)

      • Write enables R2

    • Command: symrdf -g ${group} failover

  • Update: Helps to speed up the failback operation by copying invalid tracks before write disabling any disks.

    • Actions:

      • Leaves service state as is.

      • Merges the tracks

      • Copies invalid tracks

    • Command: symrdf -g ${group} update

  • Failback:

    • Actions:

      • Write disables R2

      • Suspends RDF link

      • Merges the disk tracks.

      • Resumes the link

      • Write enables R1

      • Copies the changed data

    • Command: symrdf -g ${group} failback

  • Split: Leaves both R1 & R2 in write enabled state.

    • Actions:

      • Suspends the rdf link.

      • Write enables R2

    • Command: symrdf -g ${group} split

  • Establish:

    • Actions:

      • Write disables R2

      • Suspends the rdf link

      • Copies data from R1 to R2

      • Resumes the rdf link.

    • Command: symrdf -g ${group} [ -full ] establish

  • Restore: Copies data from R2 to R1

    • Actions:

      • Write disables both R1 & R2

      • Suspends the rdf link.

      • Merges the track tables

      • Resumes the rdf link.

      • Write enables R1

    • Command: symrdf -g ${group} [ -full ] restore

• Singular SRDF commands

  • Suspend: symrdf -g ${group} suspend

  • Resume: symrdf -g ${group} resume

  • Set mode:

    symrdf -g ${group} set mode sync
    symrdf -g ${group} set domino on
    symrdf -g ${group} set acp_disk skew 1000