• Configuring pools

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    Configuring pools

    Create a dynamic pool

    Before you begin

    In Unity all-Flash models running OE version 4.2.x or later, all new pools created in the Unisphere GUI are dynamic pools, and new pools created in the Unisphere CLI and REST API are dynamic pools by default. Before you create a dynamic pool:

    • Decide what RAID protection to use for the pool.
    • Decide whether to create a capability profile that has capabilities based on the pool configuration. To use the capability profile for VMware VVols, you must assign specific usage tags, which are propagated to the VMware vSphere environment, and can be used in policy profiles. The virtualization administrator and storage administrator should work together to define these tags.
    You cannot change the RAID type of a dynamic pool once it is created. Also, you cannot shrink a dynamic pool or change its storage characteristics without deleting the storage resources configured in the pool and the pool itself. However, you can add drives to expand the pool.
    Procedure
    1. Under Storage, select Pools.
    2. Select the Add icon.
    3. Follow the steps in the wizard.

      The number and types of drives you can choose is based on the RAID configuration, which you can optionally change.

    Create a traditional pool in physical deployments

    Before you begin

    All pools created with all-Flash models running Unity OE version 4.1.x and earlier, and all hybrid and VSA models support traditional pools only. With newer all-Flash models, you can create a traditional pool using the Unisphere CLI and REST API.

    Before you create a traditional pool:

    • If you have a hybrid model, find out whether the storage system is licensed for FAST Cache. To do this, select the Settings icon, and then select Storage Configuration > FAST Cache. If the storage system is licensed for FAST Cache, you can choose whether to use it for the pool.
    • If you have a hybrid model, find out whether the storage system is licensed for FAST VP. To do this, select the Settings icon, and then select Storage Configuration > FAST VP. If the storage system is licensed for FAST VP you can choose which storage tiers to add to the pool.
    • Decide whether to change the suggested RAID type of the tiers.
    • Decide whether to create a capability profile that has capabilities based on the pool configuration. To use the capability profile for VMware VVols, you must assign specific usage tags, which are propagated to the VMware vSphere environment, and can be used in policy profiles. The virtualization administrator and storage administrator should work together to define these tags.
    Procedure
    1. Under Storage, select Pools.
    2. Select the Add icon.
    3. Follow the steps in the wizard, taking into account the following considerations:
      • On the Tiers screen, you can only select multiple storage tiers if the system is a hybrid model that is licensed to use FAST VP. The wizard displays a maximum usable capacity for each selected tier, which it calculates based on the default RAID configuration. You can optionally change the RAID configuration for all selected tiers.
      • The number and types of drives you can choose is based on the RAID configuration.

    Create a pool in virtual deployments

    Before you begin

    All pools created in virtual deployments are traditional pools.

    Before you create a traditional pool:
    • From the storage administrator, obtain information about the underlying characteristics of the drives to use in the pool. You will use this information to assign tiers to the virtual disks that do not already have them assigned. You can create a multi-tier pool if the system has multiple underlying drive types.
    • Decide whether to create a capability profile for VMware VVols that has capabilities based on the pool configuration. To use the capability profile, you must assign specific usage tags, which are propagated to the VMware vSphere environment, and can be used in policy profiles. The virtualization administrator and storage administrator should work together to define these tags.
    You cannot shrink a pool or change its storage characteristics without deleting the storage resources configured in the pool and the pool itself. However, you can add drives to expand the pool.
    Procedure
    1. Under Storage, select Pools.
    2. Select the Add icon.
    3. Select the tiers and virtual disks to use in the pool. Each virtual disk must have an assigned tier. If the virtual disks you want to include in the pool do not have assigned tiers, you must assign one. The tier you select for a virtual disk must be based on the underlying drive characteristics.
    4. Optionally create a VMware capability profile for use by VVols, and specify usage tags for that profile.

    Enable automatic snapshot deletion for a pool

    Procedure
    1. Under Storage, select Pools.
    2. Select the relevant pool, and click the Edit icon.
    3. Select the Snapshot Settings tab.
    4. In the Automatically delete oldest snapshots section, select whether you want the automatic deletion to occur when the total pool consumption space reaches a threshold you set, snapshot pool consumption space reaches a threshold you set, or both. For each option, you can also set the threshold when the automatic snapshot deletion stops.

    Monitor pool space allocation and usage

    Procedure
    1. Under Storage, select Pools.
    2. Select the relevant pool, and then select the Edit icon.
    3. Select Usage > Capacity to view pool space usage with metrics on: current pool capacity, space used, alert threshold, compression savings, and a graph showing the pool's used capacity over time.

      Note the following:

      • The Used field displays the percentage of the pool's total space that has been reserved by its associated storage resources. This total includes the space used by thin clones and snapshots. When this value is over 100%, the pool is oversubscribed.
      • The Non-base Space field displays the space used by all snapshots and thin clones in the pool.
      • The Alert Threshold field displays the percentage of storage allocation at which Unisphere generates notifications about the amount of space remaining in the pool. You can set this value between 50% and 84%.
    4. Select Storage Resources to view a list of storage resources in the pool, along with the following metrics: total amount of pool space used by each resource and amount of pool space used for each resource's snapshots and thin clones.

    View drive information

    Procedure
    1. Select the Settings icon, and then select Storage Configuration > Drives to view the information about the drives in the storage system:
      • For physical deployments this includes the drive type, capacity, total number of drives, number of unconfigured and configured drives, and number of drives in the FAST Cache.
      • For virtual deployments, this includes the size and WWN of the virtual drives that are available for use in a pool. Drives that are already used in a pool or that are faulted are not included in the list.
    2. To view information about unconfigured drives for a specific drive type and capacity, select the number in the Unconfigured - Available column. The system displays the name, type, drive size, and rotational speed (for hard drives) of the available drives.

    Change pool properties

    Procedure
    1. Under Storage, select Pools.
    2. Select the relevant pool, and then select the Edit icon.
    3. On the General tab, optionally change the pool name and description.
    4. On the Drives tab, review the characteristics of the drives in the pool.
    5. On the Usage tab, select Capacity to view the amount of free space in the pool, subscribed pool capacity, pool used capacity history, and space saved (if compression for thin LUNs in all-Flash pools is enabled). You can also change the alert threshold.

      Note the following:

      • The Used field displays the percentage of the pool's total space that has been reserved by its associated storage resources. This total includes the space used by thin clones and snapshots. When this value is over 100%, the pool is oversubscribed.
      • The Non-base Space field displays the space used by all snapshots and thin clones in the pool.
      • The Alert Threshold field displays the percentage of storage allocation at which Unisphere generates notifications about the amount of space remaining in the pool. You can set this value between 50% and 84%.
    6. On the Usage tab, select Storage Resources to view a list of storage resources in the pool, along with applicable metrics.
    7. On the FAST VP tab (which appears if FAST VP is licensed), view data relocation and tier information for the pool. You can also exclude the pool from data relocations, manually start or stop data relocations for the pool, and manually move data to different tiers. Click Manage FAST VP settings to manage system-wide FAST VP settings.
    8. On the Snapshot Settings tab, review and optionally change the properties for snapshot automatic deletion.

    Expand a pool in physical deployments

    Expand a dynamic or traditional pool by adding drives to the pool tiers.

    Procedure
    1. Under Storage, select Pools.
    2. Select the pool to expand, and then select Expand Pool.
      If the Expand Pool button is disabled, a tool tip will display with an explanation.
    3. On the Storage Tiers tab, select the storage tiers for the drives you want to add to the pool.
    4. On the Drives tab, select the number of drives to add to each tier. You can select Flash drives by capacity.

    Expand a pool in virtual deployments

    Expand a pool by adding virtual disks to the pool. Before you expand a pool, obtain information from your storage administrator about the underlying characteristics of the virtual disks to use in the pool.
    Procedure
    1. Under Storage, select Pools.
    2. Select the pool to expand, and then select Expand Pool.
    3. On the Assign Tier to the Virtual Disk page, assign or optionally change the storage tiers to which virtual disks are assigned. To do this, select the virtual disk, select the Edit icon, and then select the tier.
    4. On the Tiers page, select one or more tiers to add to the pool.
    5. On the Virtual Disks page, select the virtual disks to add to the pool.

    Delete a pool

    You can delete pools if they contain no allocated storage resources, including consistency groups, LUNs, file systems, VMware datastores, or NAS servers.

    Procedure
    1. Under Storage, select Pools.
    2. Select the pool to delete, and click the Delete icon.