The key differences between SRDF/Metro and standard synchronous and asynchronous SRDF modes are:
- All SRDF device pairs that are in the same SRDF group and that are configured for SRDF/Metro must be managed together for all supported operations with the following exceptions:
- If all the SRDF device pairs are not ready (NR) on the link, the user may perform a createpair operation to add additional devices to the SRDF group, provided that the new SRDF device pairs are created not ready (NR) on the link.
- If all the SRDF device pairs are not ready (NR) on the link, the user may perform a deletepair operation on all or a subset of the SRDF devices in the SRDF group.
- An SRDF device pair taking part in an SRDF/Metro configuration may be brought to the following state:
- Both sides of the SRDF device pair appear to the host(s) as the same device.
- Both sides of the SRDF device pair are accessible to the host(s).