Dell SRDF Introduction

Enginuity 5876

SRDF/A SSC sessions that include an array running Enginuity 5876 have one Capture cycle and one Transmit cycle on the R1 side (legacy mode).

The following diagram shows legacy mode:

• 2 cycles (capture and transmit) on the R1 side, and
• 2 cycles (receive and apply) on the R2 side

In legacy mode, there are conditions must be met before an SSC cycle switch can take place:

• The previous cycle’s transmit delta set (N-1 copy of the data) must have completed transfer to the receive delta set on the secondary array.
• On the secondary array, the previous apply delta set (N-2 copy of the data) is written to cache, and data is marked write pending for the R2 devices.