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ADP and disk assignment differences by system in MetroCluster IP configurations

The operation of Advanced Drive Partitioning (ADP) and automatic disk assignment in MetroCluster IP configurations varies depending on the system model.

Note
In systems using ADP, aggregates are created using partitions in which each drive is partitioned in to P1, P2 and P3 partitions. The root aggregate is created using P3 partitions.

You must meet the MetroCluster limits for the maximum number of supported drives and other guidelines.

ADP and disk assignment on AFA DM5000F systems​

GuidelineShelves per siteDrive assignment rulesADP layout for root partition
Minimum recommended shelves (per site)Internal drives only

The internal drives are divided into four equal groups. Each group is automatically assigned to a separate pool and each pool is assigned to a separate controller in the configuration.

Note
Half of the internal drives remain unassigned before MetroCluster is configured.

Two quarters are used by the local HA pair. The other two quarters are used by the remote HA pair.

The root aggregate includes the following partitions in each plex:

  • Three partitions for data

  • Two parity partitions

  • One spare partition

Minimum supported shelves (per site)16 internal drives

The drives are divided into four equal groups. Each quarter-shelf is automatically assigned to a separate pool.

Two quarters on a shelf can have the same pool. The pool is chosen based on the node that owns the quarter:

  • If owned by the local node, pool0 is used.

  • If owned by the remote node, pool1 is used.

For example: a shelf with quarters Q1 through Q4 can have following assignments:

  • Q1: node_A_1 pool0

  • Q2: node_A_2 pool0

  • Q3: node_B_1 pool1

  • Q4:node_B_2 pool1

Note
Half of the internal drives remain unassigned before MetroCluster is configured.

Each of the two plexes in the root aggregate includes the following partitions:

  • One partition for data

  • Two parity partitions

  • One spare partition

ADP and disk assignment on AFA DM7000F systems​

GuidelineShelves per siteDrive assignment rulesADP layout for root partition
Minimum recommended shelves (per site)Two shelvesThe drives on each external shelf are divided into two equal groups (halves). Each half-shelf is automatically assigned to a separate pool.

One shelf is used by the local HA pair. The second shelf is used by the remote HA pair.

Partitions on each shelf are used to create the root aggregate. The root aggregate includes the following partitions in each plex:

  • Eight partitions for data

  • Two parity partitions

  • Two spare partitions

Minimum supported shelves (per site)One shelfThe drives are divided into four equal groups. Each quarter-shelf is automatically assigned to a separate pool.

Each of the two plexes in the root aggregate includes the following partitions:

  • Three partitions for data

  • Two parity partitions

  • One spare partition

Disk assignment on DM5000H systems​

GuidelineShelves per siteDrive assignment rulesADP layout for root partition
Minimum recommended shelves (per site)One internal and one external shelfThe internal and external shelves are divided into two equal halves. Each half is automatically assigned to different poolNot applicable.
Minimum supported shelves (per site) (active/passive HA configuration)Internal drives onlyManual assignment required.

Disk assignment on DM7000H systems​

GuidelineShelves per siteDrive assignment rulesADP layout for root partition
Minimum supported shelves (per site)Two shelvesThe drives on the external shelves are divided into two equal groups (halves). Each half-shelf is automatically assigned to a separate pool.Not applicable.
Minimum supported shelves (per site) (active/passive HA configuration)One shelfManual assignment required.