VDS_POOL_ATTRIBUTES structure (vds.h)

Article
02/09/2023

[Beginning with Windows 8 and Windows Server 2012, the Virtual Disk Service COM interface is superseded by the Windows Storage Management API.]

Defines the attributes of a storage pool.

Syntax

typedef struct _VDS_POOL_ATTRIBUTES {
  ULONGLONG                  ullAttributeMask;
  VDS_RAID_TYPE              raidType;
  VDS_STORAGE_BUS_TYPE       busType;
  LPWSTR                     pwszIntendedUsage;
  BOOL                       bSpinDown;
  BOOL                       bIsThinProvisioned;
  ULONGLONG                  ullProvisionedSpace;
  BOOL                       bNoSinglePointOfFailure;
  ULONG                      ulDataRedundancyMax;
  ULONG                      ulDataRedundancyMin;
  ULONG                      ulDataRedundancyDefault;
  ULONG                      ulPackageRedundancyMax;
  ULONG                      ulPackageRedundancyMin;
  ULONG                      ulPackageRedundancyDefault;
  ULONG                      ulStripeSize;
  ULONG                      ulStripeSizeMax;
  ULONG                      ulStripeSizeMin;
  ULONG                      ulDefaultStripeSize;
  ULONG                      ulNumberOfColumns;
  ULONG                      ulNumberOfColumnsMax;
  ULONG                      ulNumberOfColumnsMin;
  ULONG                      ulDefaultNumberofColumns;
  ULONG                      ulDataAvailabilityHint;
  ULONG                      ulAccessRandomnessHint;
  ULONG                      ulAccessDirectionHint;
  ULONG                      ulAccessSizeHint;
  ULONG                      ulAccessLatencyHint;
  ULONG                      ulAccessBandwidthWeightHint;
  ULONG                      ulStorageCostHint;
  ULONG                      ulStorageEfficiencyHint;
  ULONG                      ulNumOfCustomAttributes;
  VDS_POOL_CUSTOM_ATTRIBUTES *pPoolCustomAttributes;
  BOOL                       bReserved1;
  BOOL                       bReserved2;
  ULONG                      ulReserved1;
  ULONG                      ulReserved2;
  ULONGLONG                  ullReserved1;
  ULONGLONG                  ullReserved2;
} VDS_POOL_ATTRIBUTES, *PVDS_POOL_ATTRIBUTES;

Members

ullAttributeMask

A mask that specifies the attributes in the structure that are defined by this storage pool.

The list of valid attribute flags is as follows. Each flag corresponds to a member in the VDS_POOL_ATTRIBUTES structure. Unused bits are reserved.

Value	Attribute defined by the storage pool
VDS_POOL_ATTRIB_RAIDTYPE 0x1L	raidType
VDS_POOL_ATTRIB_BUSTYPE 0x2L	busType
VDS_POOL_ATTRIB_ALLOW_SPINDOWN 0x4L	bSpinDown
VDS_POOL_ATTRIB_THIN_PROVISION 0x8L	bIsThinProvisioned
VDS_POOL_ATTRIB_NO_SINGLE_POF 0x10L	bNoSinglePointOfFailure
VDS_POOL_ATTRIB_DATA_RDNCY_MAX 0x20L	ulDataRedundancyMax
VDS_POOL_ATTRIB_DATA_RDNCY_MIN 0x40L	ulDataRedundancyMin
VDS_POOL_ATTRIB_DATA_RDNCY_DEF 0x80L	ulDataRedundancyDefault
VDS_POOL_ATTRIB_PKG_RDNCY_MAX 0x100L	ulPackageRedundancyDefault
VDS_POOL_ATTRIB_PKG_RDNCY_MIN 0x200L	ulPackageRedundancyMin
VDS_POOL_ATTRIB_PKG_RDNCY_DEF 0x400L	ulPackageRedundancyDefault
VDS_POOL_ATTRIB_STRIPE_SIZE 0x800L	ulStripeSize
VDS_POOL_ATTRIB_STRIPE_SIZE_MAX 0x1000L	ulStripeSizeMax
VDS_POOL_ATTRIB_STRIPE_SIZE_MIN 0x2000L	ulStripeSizeMin
VDS_POOL_ATTRIB_STRIPE_SIZE_DEF 0x4000L	ulDefaultStripeSize
VDS_POOL_ATTRIB_NUM_CLMNS 0x8000L	ulNumberOfColumns
VDS_POOL_ATTRIB_NUM_CLMNS_MAX 0x10000L	ulNumberOfColumnsMax
VDS_POOL_ATTRIB_NUM_CLMNS_MIN 0x20000L	ulNumberOfColumnsMin
VDS_POOL_ATTRIB_NUM_CLMNS_DEF 0x40000L	ulDefaultNumberofColumns
VDS_POOL_ATTRIB_DATA_AVL_HINT 0x80000L	ulDataAvailabilityHint
VDS_POOL_ATTRIB_ACCS_RNDM_HINT 0x100000L	ulAccessRandomnessHint
VDS_POOL_ATTRIB_ACCS_DIR_HINT 0x200000L	ulAccessDirectionHint
VDS_POOL_ATTRIB_ACCS_SIZE_HINT 0x400000L	ulAccessSizeHint
VDS_POOL_ATTRIB_ACCS_LTNCY_HINT 0x800000L	ulAccessLatencyHint
VDS_POOL_ATTRIB_ACCS_BDW_WT_HINT 0x1000000L	ulAccessBandwidthWeightHint
VDS_POOL_ATTRIB_STOR_COST_HINT 0x2000000L	ulStorageCostHint
VDS_POOL_ATTRIB_STOR_EFFCY_HINT 0x4000000L	ulStorageEfficiencyHint
VDS_POOL_ATTRIB_CUSTOM_ATTRIB 0x8000000L	pPoolCustomAttributes

raidType

A VDS_RAID_TYPE enumeration value that specifies the RAID type of the storage pool. If the storage pool does not have a specific RAID type, set this member to VDS_RT_UNKNOWN and clear the VDS_POOL_ATTRIB_RAIDTYPE attribute flag in the ullAttributeMask member.

busType

A VDS_STORAGE_BUS_TYPE enumeration value that specifies the bus type of the drives in the storage pool.

pwszIntendedUsage

A string that specifies the usage of the storage pool. Typically, this may indicate the application that is using the storage pool (for example, "SQL" or "Exchange") or the business function that is using the storage pool (for example, "Finance" or "Human Resources").

bSpinDown

TRUE if the drives in the storage pool spin down automatically to reduce power usage, or FALSE otherwise.

bIsThinProvisioned

TRUE if the storage pool is thin provisioned, or FALSE otherwise. If the pool is thin provisioned, the number of bytes in the consumed space of the pool could be less than the number of bytes in the provisioned space of the pool. (The number of bytes in the provisioned space is stored in the ullProvisionedSpace member of this structure. The number of bytes in the consumed space is stored in the ullTotalConsumedSpace member of the VDS_STORAGE_POOL_PROP structure.) When a hardware provider sets this member to TRUE, it must also set the type member of the VDS_STORAGE_POOL_PROP structure to VDS_SPT_CONCRETE.

ullProvisionedSpace

If the pool is thin provisioned, this member specifies the space, in bytes, that is provisioned for the pool. The value of this member must be greater than or equal to the value of the ullTotalConsumedSpace member of the VDS_STORAGE_POOL_PROP structure.

bNoSinglePointOfFailure

TRUE if there is no single point of failure in the pool, or FALSE otherwise.

ulDataRedundancyMax

The maximum number of complete copies of the data that can be maintained in this storage pool.

ulDataRedundancyMin

The minimum number of complete copies of the data that can be maintained in this storage pool.

ulDataRedundancyDefault

The default number of complete copies of the data that are maintained in this storage pool.

ulPackageRedundancyMax

The maximum number of drives that can be used in the storage pool to ensure package redundancy. Package redundancy indicates the number of drives that can fail in the storage pool without resulting in a data loss.

ulPackageRedundancyMin

The minimum number of drives that can be used in the storage pool to ensure package redundancy. Package redundancy indicates the number of drives that can fail in the storage pool without resulting in a data loss.

ulPackageRedundancyDefault

The default number of drives that are used in the storage pool to ensure package redundancy. Package redundancy indicates the number of drives that can fail in the storage pool without resulting in a data loss.

ulStripeSize

The mirror or parity stripe size, in bytes, of the storage pool if the pool is striped (with or without parity).

ulStripeSizeMax

The maximum stripe size, in bytes, that is supported by the storage pool.

ulStripeSizeMin

The minimum stripe size, in bytes, that is supported by the storage pool.

ulDefaultStripeSize

The default stripe size, in bytes, that is supported by the storage pool.

ulNumberOfColumns

The number of columns of the storage pool if the pool is striped (with or without parity).

ulNumberOfColumnsMax

The maximum number of columns supported by the storage pool.

ulNumberOfColumnsMin

The minimum number of columns supported by the storage pool.

ulDefaultNumberofColumns

The default number of columns supported by the storage pool.

ulDataAvailabilityHint

A hint from the client that indicates the importance placed on data availability. Values range from 0 (Not Important) to 10 (Very Important).

ulAccessRandomnessHint

A hint from the client that indicates the randomness of data access. Values range from 0 (Entirely Sequential) to 10 (Entirely Random).

ulAccessDirectionHint

A hint from the client that indicates the direction of data access. Values range from 0 (Entirely Read) to 10 (Entirely Write).

ulAccessSizeHint

A hint from the client that indicates the optimal access size in megabytes.

ulAccessLatencyHint

A hint from the client that indicates the importance of access latency to the client. Values range from 0 (Not Important) to 10 (Very Important).

ulAccessBandwidthWeightHint

A hint from the client that indicates the importance of high bandwidth. Values range from 0 (Not Important) to 10 (Very Important).

ulStorageCostHint

A hint from the client that indicates the importance of storage cost to the client. Values range from 0 (Not Important) to 10 (Very Important). If the storage cost is very important to the client, a value of 10 indicates that the client would prefer to provision the pool using lower cost storage.

ulStorageEfficiencyHint

A hint from the client that indicates the importance of storage efficiency to the client. Values range from 0 (Not Important) to 10 (Very Important).

ulNumOfCustomAttributes

The number of custom attributes defined for the storage pool.

pPoolCustomAttributes

An array of VDS_POOL_CUSTOM_ATTRIBUTES structures. Each structure contains a custom attribute that is defined for the storage pool.

bReserved1