Dell SRDF Introduction

Read operations if R1 local copy fails

In SRDF/S, SRDF/A, and adaptive copy configurations, SRDF devices can process read I/Os that cannot be processed by regular logical devices. If the R1 local copy fails, the R1 device can still service the request as long as its SRDF state is Ready and the R2 device has good data.

SRDF emulations help service the host read requests when the R1 local copy is not available:

• The SRDF emulations bring data from the R2 device to the host site.
• The host perceives this as an ordinary read from the R1 device, although the data was read from the R2 device acting as if it was a local copy.