Move volumes to another I/O group

You can move a volume to a new I/O group to balance the workload across the canisters in the system without stopping host activity to the volumes. The wizard changes only the I/O group for the volume and does not change where the data resides on the backend storage.

You can use this wizard to move volumes permanently to another I/O group to balance host operations and to balance workload on the system. In this situation, you need at least two I/O groups. For example, if you added another I/O group and had 50 volumes that used the existing I/O group, you might move 25 to the new I/O group to increase performance. You can also use this wizard to move volumes to another I/O group temporarily so that maintenance can be performed on the original I/O group, such as replacement. After the is replaced, you can move the volumes to the original I/O group.

You can use the wizard to move both unmapped volumes and mapped volumes. For unmapped volumes, the wizard automatically adds the new I/O group to the list of accessible I/O groups for the selected volumes. You can then map the volume to the host system after you move the volume. For volumes mapped to Fibre Channel hosts, the wizard also moves the selected volumes to the I/O group without disrupting host access to the data. However, to ensure that the data is accessible, this process requires that hosts are updated to detect the new paths to the new I/O group. You can either specify a preferred node or have the system set the preferred node automatically for the volume in the new I/O group. Hosts then detect the new paths, including detecting which of those new paths are preferred. The hosts access the volumes through the preferred node to ensure that host traffic is balanced among both nodes in the I/O group. If you want to move volumes that are mapped to iSCSI hosts, see Moving volumes mapped to iSCSI hosts to another I/O group

Most volumes can be moved; however, volumes used in either Metro Mirror or Global Mirror relationships cannot be moved to another I/O group without first removing them from those relationships. Mirrored, compressed, thin-provisioned volumes, and volumes that are used in FlashCopy mappings can be moved to another I/O group without any other modifications.