Data for storage system volumes in performance reports

You can include general information, capacity data, properties, and other information about storage system volumes in performance reports.

Information about storage system volumes

You can create performance reports that include the following information:

Storage System Name: A user-defined name of the storage system. If a name was not defined, IBM Spectrum® Control shows the name that was defined when the storage system was added for monitoring.
Storage Controller Name: The name that was assigned to the controller when it was added to the system.
Storage Pool Name: The name that was assigned to the pool when it was added to the system.
Storage RAID Array Name: The name that was assigned to the RAID array when it was added to the system.
Storage I/O Group Name: The name that was assigned to the I/O group when it was added to the system.
Storage Preferred Node Name: The name of the storage node that is used for I/O operations for a volume.
Storage Volume Name: The name that was assigned to the storage volume when it was added to the system.
Storage Volume Assigned Host Connection: The host connection to which the storage volume is assigned. The host connection is a definition in the storage system that contains the WWPN for the server. The storage system uses the WWPN to assign volumes to servers.
Storage Volume Host Connection OS Type: The operating system type of the server or hypervisor that the volume is assigned to.
Storage System Volume Group ID: The unique identifier for a collection of volumes on DS8000® storage systems. The storage system generates this identifier.
Storage Volume Group Name: The user-defined name for a collection of volumes on DS8000 storage systems.
Server Name: The fully qualified domain name of the server. For example, the name of a server might be server.example.com.
Hypervisor Name: The fully qualified domain name of the hypervisor. For example, the name of a hypervisor might be hypervisor.example.com.
Hypervisor Cluster Name: The name of a cluster that is monitored in your storage environment. A cluster is a group of hypervisors that collaborate for the purposes of workload balancing and failover.

Capacity and usage data

You can create performance reports that include the following information:

Storage Volume Capacity (GiB)

The total amount of storage space that is committed to a volume.

For thin-provisioned volumes, this value represents the virtual capacity of the volume.

For XIV® systems and IBM Storage Accelerate™, this value represents the physical (hard) capacity of the volume, not the virtual (soft) capacity. For other storage systems, this value might also include overhead space if the pool is unformatted.

Storage Volume Used Space (GiB)

The amount of allocated space that is used by a volume.

For resources that are running IBM Storage Virtualize™, you can preallocate thin-provisioned volume space when the volumes are created. In these cases, the Storage Volume Used Space (GiB) might be different than the Storage Volume Allocated Space (GiB). For volumes that are not thin provisioned, the values for Storage Volume Used Space (GiB) and Storage Volume Allocated Space (GiB) are equal.

This value is accurate as of the most recent time that IBM Spectrum Control collected data about a volume. The value in this property might not be 100% accurate for the current state of volumes. This inaccuracy might occur because data collection is run on a set schedule and the used space on volumes can change rapidly.

Storage Volume Overhead (GiB)

The amount of space that is used for system management. The amount of space also includes space that is reserved for redundancy.

Storage Volume Allocated Space (GiB)

The amount of space that is reserved for a volume. The space that is allocated for a thin-provisioned volume is less than its virtual capacity, which is shown in the Storage Volume Capacity (GiB) property. This value is equal to the value in the Storage Volume Used Space (GiB) property for the following resources:

Resources other than those that are running IBM Storage Virtualize and are configured as back-end storage
Resources that are running IBM Storage Virtualize, are configured as back-end storage, and are not thin-provisioned

Storage Volume Unallocated Space (GiB)

The amount of space in a pool that is not reserved for a volume.

IBM Spectrum Control uses the following formula to determine this value:

capacity - allocated space

Available only for thin provisioned volumes.

Storage Volume Physical Allocation Percentage

The percentage of physical space that is reserved for a volume. This value is always less than or equal to 100% because you cannot reserve more physical space than is available.

IBM Spectrum Control uses the following formula to determine this value:

(allocated space ÷ capacity) × 100

For example, the physical allocation percentage is 25% for a volume size of 200 GiB. Therefore, the space that is reserved for volumes is 50 GiB.

Storage Volume Shortfall Percentage

The percentage of the remaining unallocated volume space in a pool that is not available to be allocated to a volume.

The higher the percentage, the more critical the shortfall of space.

IBM Spectrum Control uses the following formula to determine this value:

(unallocatable volume Space ÷ volume unallocated space) × 100

You can use this percentage to determine when the amount of overcommitted space in pools reaches a critically high level. For example, the physical space in pools might be less than the committed virtual space. In this case, the pools do not have enough space to fulfill the commitment to virtual space for a volume.

This Storage Volume Shortfall Percentage represents the percentage of the committed virtual space that is not available in a pool. As more space is used over time by a volume while the pool capacity remains the same, this percentage increases.

For example, the remaining physical capacity of a pool is 70 GiB, however, 150 GiB of virtual space is committed to a thin-provisioned volume. If the volume is using 50 GiB, then there is still 100 GiB committed to that volume (150 GiB - 50 GiB). There is a shortfall of 30 GiB (70 GiB remaining pool space - 100 GiB remaining commitment of volume space to the volume). The volume is overcommitted by 30 GiB based on the available space in the pool. The shortfall is 30% when you use the following calculation:

100 GiB unallocated volume space - 70 GiB remaining
pool space ÷ 100 GiB unallocated volume space × 100

Storage Volume Unallocatable Space (GiB)

The unallocatable storage space in GiB of a thin-provisioned volume. Unallocatable space cannot be supplied by the pool to which the volume belongs.

Storage Volume Used Allocated Space Percentage

The percentage of reserved space for a volume that is being used. This value is always less than or equal to 100% because a volume cannot use more space than is allocated.

IBM Spectrum Control uses the following formula to determine this value:

(volume used space ÷ volume allocated space) × 100

This property is available only for volumes on resources that are running IBM Storage Virtualize.

Storage Volume Unused Space (GiB)

The amount of space that is allocated to a volume and is not yet used.

IBM Spectrum Control uses the following formula to determine this value:

allocated space - used space

This property is available only for pools on resources that are running IBM Storage Virtualize.

Storage Volume Uncompressed Capacity (GiB)

The amount of storage space that is used if the compressed volume space is uncompressed. For example, if 100 GiB of uncompressed data is compressed, and the size of the compressed data is 20 GiB, the value is 100.

Component properties

You can create performance reports that include the following information:

Storage Volume RAID Level

The RAID level of the resource, such as RAID 5 or RAID 10. The RAID level affects the performance and fault tolerance of the volumes that are allocated from the resource.

Storage Volume Is Thin Provisioned

Shows whether a pool, volume, or volume copy is thin-provisioned. If this value is Yes, the resource is thin-provisioned.

Storage Volume Is Assigned

Shows whether the volume is assigned to a server. If this value is Yes, the volume is assigned to a server.

Storage Volume Is Encrypted

Shows whether the resource is encrypted. If this value is Yes, the resource is encrypted.

Storage Volume Is Encryptable

Shows whether the resource can be encrypted. If this value is Yes, the resource can be encrypted.

Storage Volume Is Volume Control Manager Database

Shows whether a volume is used as the Volume Control Manager Database. If this value is Yes, the volume is used as the Volume Control Manager Database.

Storage Volume Format

Shows the format of the volume or pool. The format can be a Count Key Data (CKD) format, or a fixed block format.

Storage Volume Serial Number

The serial number or volume ID of the volume.

Storage Volume Number

The number of the volume that is assigned by the system.

Storage Volume WWN

The worldwide name of the volume.

Storage Volume FlashCopy® Relationship

Shows whether a volume on a storage system is in a FlashCopy relationship. This property can contain the following values:

Source Relationship: The volume is the source of the relationship.
Target Relationship: The volume is the target of the relationship.
Both Source and Target Relationship: The volume is both the source and target of the relationship.
Not in a FlashCopy Relationship: The volume is not in a FlashCopy relationship.

Storage Volume Remote Copy Relationship

Shows whether a volume on a storage system is in a remote copy relationship. This property can contain the following values:

Not in a Copy Relationship: The volume is not in a remote copy relationship.
Source Relationship: The volume is the source of the relationship.
Target Relationship: The volume is the target of the relationship.
Both Source and Target Relationship: The volume is both the source and target of the relationship.

Storage Volume Logical Subsystem

The logical subsystem (LSS) to which a volume or pool belongs.

Storage Volume Type

The type of storage volume. For example, the storage volume can be striped or sequential. This value is only available for resources that are running IBM Storage Virtualize and are configured as back-end storage.

Storage Volume Fast Write State

Shows whether the cache for a volume on a disk that is managed by a storage virtualizer is empty, contains data, or is corrupted.

Storage Volume Grain Size (KiB)

The grain size with which a thin-provisioned volume was created. This value is typically 32, 64, 128, or 256 KiB. Larger grain sizes maximize performance, whereas smaller grain sizes maximize space efficiency. Grain sizes also limit the maximum virtual space of a volume.

This value is only available for resources that are running IBM Storage Virtualize and are configured as back-end storage.

Storage Volume Is Auto Expand Enabled

Shows whether a volume can automatically allocate new extents from a pool. Volumes might allocate new extents to expand the real capacity of the volume. If this value is Yes, the volume can automatically allocate new extents from a pool.

This value is only available for resources that are running IBM Storage Virtualize and are configured as back-end storage.

Storage Volume Metro Mirror Name

The name of the Metro Mirror that keeps the synchronous copy of the storage volume. This value is only available for resources that are running IBM Storage Virtualize and are configured as back-end storage.

Storage Volume Mirror Count

The number of mirrors that keep a synchronous copy of the resource. This value is only available for resources that are running IBM Storage Virtualize and are configured as back-end storage.

Storage Volume Throttle

The maximum number of commands that the volume can queue. This value is only available for resources that are running IBM Storage Virtualize and are configured as back-end storage.

Storage Volume Warning Level

The percentage of volume capacity that is used at which a warning is generated. This value is only available for resources that are running IBM Storage Virtualize and are configured as back-end storage.

Storage Volume Is Compressed

Shows whether the volume is compressed. If this value is Yes, the volume is compressed.

Storage System Configuration

Shows whether a storage system is configured as back-end storage or configured to virtualize back-end storage. If this value is

Storage
System

, the storage system is configured as back-end storage. If this value is Storage Virtualizer, the storage system is configured to virtualize back-end storage.

Status information

You can create performance reports that include the following information:

Storage Volume Status: The condition of the resource, for example normal, warning, or error.
Storage Volume Is Detected: Shows whether the resource was detected the last time that data was collected. If this value is Yes, the resource was detected.
Storage Volume Native Status: The condition of the volume. The status can be online, offline, degraded, or excluded.