I/O groups

View the information that is shown about I/O groups in block storage systems.

Each pair of nodes within a single enclosure is known as an input/output (I/O) group.

The following information is shown for each I/O group:
Compression
The compression level of the I/O group. Possible values are listed.
Unsupported
Indicates that the I/O group does not support compressed volumes or its nodes are down-level for supporting compressed volumes.
Supported
Indicates that the I/O group supports compressed volumes.
Active
Indicates that the I/O group contains at least one compressed volume.
Availability: Nodes on storage systems that run IBM Storage Virtualize. These nodes support Random Access Compression Engine (RACE) compression for volumes in standard pools.
Enclosure
The enclosure that is associated exclusively with the I/O Group. For IBM Storage FlashSystem V9000, the storage enclosure is shared by all I/O groups.
FC Ports
The number of FC ports in an I/O group. To view details about the FC ports, click the number.
Nodes
The nodes that form the I/O group. Each node is separated by a comma. A single node in this list might indicate a node failure.
Total FlashCopy Memory (MiB)
The total amount of I/O group memory that is configured for standard FlashCopy and incremental FlashCopy. The amount of memory that is configured determines the amount of volume space that can be associated with FlashCopy targets. The column is blank if no memory is available.
Total Mirroring Memory (MiB)
The total amount of I/O Group memory that is configured for volume mirroring. This value determines the amount of volume space that can be mirrored. The column is blank if no memory is configured for volume mirroring.
Total Remote Copy Memory (MiB)
The total amount of I/O group memory that is configured for Metro Mirror and Global Mirror. The amount of memory that is configured determines the amount of volume space that can be associated with Metro Mirror and Global Mirror targets. The column is blank if no memory is available.
Used FlashCopy Memory (MiB)
The amount of I/O group memory that is used for FlashCopy. This column is blank if no memory is available.
Used Mirroring Memory (MiB)
The amount of I/O Group memory that is used for volume mirroring. This column is blank if no memory is available.
Used Remote Copy Memory (MiB)
The amount of I/O group memory that is used for Metro Mirror and Global Mirror. This column is blank if no memory is available.
Volumes
The number of volumes (virtual disks) that are assigned to the I/O Group.