Allowed remote mirror and copy volume pair conversions

This topic describes allowed volume pair conversions using the remote mirror and copy function.

You can convert remote mirror and copy volume pairs between copy modes. For example, you can convert volume pairs in Global Copy to Metro Mirror mode and vice versa. If you create a Global Copy volume pair where the source volume was associated with a 1750 storage unit and the target volume was associated with an ESS 2105 Model 800 or 750, you can convert that volume pair to Metro Mirror mode.

Before you establish remote mirror and copy volume pairs, logical paths must be established between the source and target logical subsystem (LSS). I/O ports must be available and configured before you can establish paths between the source and target LSSs. Each LSS with source volumes requires at least one path to be established to the LSS that holds the target volumes.

The following mkpprcpath command establishes remote mirror and copy paths:

dscli>mkpprcpath -dev storage_image_ID -remotedev storage_image_ID 
-remotewwnn wwnn -srclss source_LSS_ID -tgtlss target_LSS_ID 
source_port_ID:target_port_ID

Example

dscli>mkpprcpath -dev IBM.1750-75FA120 -remotedev IBM.1750-68FA150  
-srclss 00 -tgtlss 00 -remotewwnn 12341234000A000F
 I1A10:I2A20

Convert Metro Mirror volume pairs to Global Copy mode

You can convert a Metro Mirror volume pair to Global Copy mode. For example, because Global Copy can operate at very long distances, well beyond the 300 km (maximum supported distance for Metro Mirror), you might want to convert some Metro Mirror volume pairs, which contain less critical application data, to Global Copy mode.

The following mkpprc command converts Metro Mirror volume pairs Global Copy mode:

dscli> mkpprc -dev storage_image_ID -remotedev storage_image_ID 
-type gcp SourceVolumeID:TargetVolumeID

Example

dscli>mkpprc -dev IBM.1750-68FA120 -remotedev IBM.1750-68FA150
 0100:0100 -type gcp 0101:0101 0102:0102 0103:0103

Convert Global Copy volume pairs to Metro Mirror mode

There are two common situations when you would convert a Global Copy volume pair to a Metro Mirror mode:

You have used Global Copy to complete the bulk transfer of data in the creation of many copy pairs, and you now want to convert some or all of those pairs to Metro Mirror mode. This process resynchronizes the volume pairs by copying all changed data from the source volumes to the target volumes.
You have Global Copy pairs for which you want to make FlashCopy backups on the remote site. You convert the pairs temporarily to synchronous mode in order to obtain a point-in-time consistent copy.

The following mkpprc command converts Global Copy volume pairs to Metro Mirror mode:

dscli> mkpprc -dev storage_image_ID -remotedev storage_image_ID 
-type mmir SourceVolumeID:TargetVolumeID

Example

dscli>mkpprc -dev IBM.1750-68FA120 -remotedev IBM.1750-68FA150
 0100:0100 -type mmir 0101:0101 0102:0102 0103:0103