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Pre-populate a FlexCache volume in the cluster

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PATCH /storage/flexcache/flexcaches/{uuid}

Introduced In: 9.8

Prepopulates a FlexCache volume in the cluster, or modifies configuration of the FlexCache volume.

Required properties

  • uuid - FlexCache volume UUID.

  • prepopulate.exclude_dir_paths - List of directory-paths to be excluded from prepopulation for the FlexCache volume.

  • prepopulate.dir_paths - List of directory-paths to be prepopulated for the FlexCache volume.

  • writeback.enabled - false. This property specifies whether writeback is enabled for the FlexCache volume.

#* writeback.per_inode_dirty_limit - This property specifies the amount of data in 4KB blocks that the system can write per inode in a FlexCache volume before a writeback is initiated for that inode.

#* writeback.transfer_limit - This property specifies the maximum number of 4KB data blocks the system can transfer, at one time, from the cache to the origin. This process will keep on recurring until all the dirty blocks for the inode are transferred to the origin volume.

#* writeback.scrub_threshold - This property specifies the threshold value in 4KB data blocks which when hit will trigger a scrub that will initiate writeback for all dirty inodes on the FlexCache volume.

  • relative_size.enabled - This property specifies whether the relative sizing is enabled for the FlexCache volume.

  • relative_size.percentage - This property specifies the percent size FlexCache volume should have relative to the total size of the origin volume.

Default property values

If not specified in PATCH, the following default property value is assigned:

  • prepopulate.recurse - Default value is "true".

  • volume flexcache prepopulate start

  • volume flexcache config modify

Learn more

Parameters

Name Type In Required Description

uuid

string

path

True

Unique identifier of the FlexCache volume.

return_timeout

integer

query

False

The number of seconds to allow the call to execute before returning. When doing a POST, PATCH, or DELETE operation on a single record, the default is 0 seconds. This means that if an asynchronous operation is started, the server immediately returns HTTP code 202 (Accepted) along with a link to the job. If a non-zero value is specified for POST, PATCH, or DELETE operations, ONTAP waits that length of time to see if the job completes so it can return something other than 202.

  • Default value: 1

  • Max value: 120

  • Min value: 0

Request Body

Name Type Description

_links

_links

aggregates

array[aggregates]

constituents_per_aggregate

integer

Number of FlexCache constituents per aggregate when the 'aggregates' field is mentioned.

dr_cache

boolean

If set to true, a DR cache is created.

global_file_locking_enabled

boolean

Specifies whether or not a FlexCache volume has global file locking mode enabled. Global file locking mode is a mode where protocol read locking semantics are enforced across all FlexCaches and origins of a FlexCache volume. When global file locking mode is enabled, the "is_disconnected_mode_off_for_locks" flag is always set to "true".

guarantee

guarantee

name

string

FlexCache name

origins

array[flexcache_relationship]

path

string

The fully-qualified path in the owning SVM's namespace at which the FlexCache is mounted. The path is case insensitive and must be unique within a SVM's namespace. Path must begin with '/' and must not end with '/'. Only one FlexCache be mounted at any given junction path.

prepopulate

prepopulate

FlexCache prepopulate

relative_size

relative_size

FlexCache Relative Size

size

integer

Physical size of the FlexCache. The recommended size for a FlexCache is 10% of the origin volume. The minimum FlexCache constituent size is 1GB.

svm

svm

FlexCache SVM

use_tiered_aggregate

boolean

Specifies whether or not a Fabricpool-enabled aggregate can be used in FlexCache creation. The use_tiered_aggregate is only used when auto-provisioning a FlexCache volume.

uuid

string

FlexCache UUID. Unique identifier for the FlexCache.

writeback

writeback

FlexCache Writeback
Example request 
{
  "_links": {
    "self": {
      "href": "/api/resourcelink"
    }
  },
  "aggregates": [
    {
      "_links": {
        "self": {
          "href": "/api/resourcelink"
        }
      },
      "name": "aggr1",
      "uuid": "1cd8a442-86d1-11e0-ae1c-123478563412"
    }
  ],
  "guarantee": {
    "type": "string"
  },
  "name": "vol1",
  "origins": [
    {
      "cluster": {
        "_links": {
          "self": {
            "href": "/api/resourcelink"
          }
        },
        "name": "cluster1",
        "uuid": "1cd8a442-86d1-11e0-ae1c-123478563412"
      },
      "create_time": "2018-06-04 15:00:00 -0400",
      "ip_address": "10.10.10.7",
      "size": 0,
      "state": "string",
      "svm": {
        "_links": {
          "self": {
            "href": "/api/resourcelink"
          }
        },
        "name": "svm1",
        "uuid": "02c9e252-41be-11e9-81d5-00a0986138f7"
      },
      "volume": {
        "_links": {
          "self": {
            "href": "/api/resourcelink"
          }
        },
        "name": "volume1",
        "uuid": "028baa66-41bd-11e9-81d5-00a0986138f7"
      }
    }
  ],
  "path": "/user/my_fc",
  "prepopulate": {
    "dir_paths": [
      "/dir1"
    ],
    "exclude_dir_paths": [
      "/dir1/dir2"
    ]
  },
  "svm": {
    "_links": {
      "self": {
        "href": "/api/resourcelink"
      }
    },
    "name": "svm1",
    "uuid": "02c9e252-41be-11e9-81d5-00a0986138f7"
  },
  "uuid": "1cd8a442-86d1-11e0-ae1c-123478563412"
}

Response

Status: 202, Accepted
Name Type Description

job

job_link
Example response 
{
  "job": {
    "_links": {
      "self": {
        "href": "/api/resourcelink"
      }
    },
    "uuid": "string"
  }
}

Error

Status: Default

ONTAP Error Response Codes

Error Code Description

66846922

FlexCache volume does not exist in the SVM

66846923

Failed to prepopulate FlexCache volume because the origin volume is not reachable

66846924

FlexCache volume is offline

66846925

FlexCache volume is not mounted or the junction-path is not active

66846926

The junction-path of FlexCache volume is not active

66846927

FlexCache volume does not have an origin volume

66846928

FlexCache volume does not exist

66846929

Using FlexCache prepopulate requires an effective cluster version of 9.8.0 or later

66846930

Using FlexCache prepopulate in a MetroCluster configuration requires an effective cluster version of 9.8.0 or later on both the local and remote clusters

66846931

Internal Error. FlexCache prepopulate job queue failed. Wait a few minutes, and then try the operation again

66846936

Failed to lookup root file handle for origin of FlexCache volume. Wait a few minutes, and then try the operation again

66846937

Internal error. Failed to initialize thread

66846939

Internal error. Failed to get the MSID of the origin volume for FlexCache volume

66846943

Failed to prepopulate because dir_path does not exist

66846944

Failed to get root constituent for FlexCache volume

66846945

Origin of FlexCache volume is not mounted or the junction-path is not active

66846946

The junction-path of origin of FlexCache volume is not active

66846947

FlexCache prepopulate job for FlexCache volume already exists

66846948

FlexCache prepopulate job for FlexCache volume could not be queued because the node is offline
Name Type Description

error

error
Example error 
{
  "error": {
    "arguments": [
      {
        "code": "string",
        "message": "string"
      }
    ],
    "code": "4",
    "message": "entry doesn't exist",
    "target": "uuid"
  }
}

Definitions

See Definitions

href

Name Type Description

href

string

_links

Name Type Description

self

href

aggregates

Name Type Description

_links

_links

name

string

uuid

string

guarantee

Name Type Description

type

string

The type of space guarantee of this volume in the aggregate.

cluster

Name Type Description

_links

_links

name

string

uuid

string

svm

Name Type Description

_links

_links

name

string

The name of the SVM.

uuid

string

The unique identifier of the SVM.

volume

Name Type Description

_links

_links

name

string

The name of the volume.

uuid

string

Unique identifier for the volume. This corresponds to the instance-uuid that is exposed in the CLI and ONTAPI. It does not change due to a volume move.

  • example: 028baa66-41bd-11e9-81d5-00a0986138f7

  • Introduced in: 9.6

  • x-nullable: true

flexcache_relationship

Name Type Description

cluster

cluster

create_time

string

Creation time of the relationship.

ip_address

string

Cluster managerment IP of the remote cluster.

size

integer

Size of the remote volume.

state

string

Volume state

svm

svm

volume

volume

prepopulate

FlexCache prepopulate

Name Type Description

dir_paths

array[string]

exclude_dir_paths

array[string]

recurse

boolean

Specifies whether or not the prepopulate action should search through the dir_paths recursively. If not set, the default value true is used.

relative_size

FlexCache Relative Size

Name Type Description

enabled

boolean

Specifies whether the relative sizing is enabled for the FlexCache volume. Relative sizing is introduced as a part of follow the origin feature. When relative sizing is enabled, it blocks any modifications done manually in the absolute size of the FlexCache volume. The size of the FlexCache volume is calculated and entered automatically based on the size of the origin volume.

percentage

integer

Specifies the percent size the FlexCache volume should have relative to the total size of the origin volume. This property is only relevant to a FlexCache volume that has the relative size property enabled.

svm

FlexCache SVM

Name Type Description

_links

_links

name

string

The name of the SVM.

uuid

string

The unique identifier of the SVM.

writeback

FlexCache Writeback

Name Type Description

enabled

boolean

Indicates whether or not writeback is enabled for the FlexCache volume. Writeback is a storage method where data is first written to the FlexCache volume and then written to the origin of a FlexCache volume.

flexcache

Defines the cache endpoint of FlexCache.

Name Type Description

_links

_links

aggregates

array[aggregates]

constituents_per_aggregate

integer

Number of FlexCache constituents per aggregate when the 'aggregates' field is mentioned.

dr_cache

boolean

If set to true, a DR cache is created.

global_file_locking_enabled

boolean

Specifies whether or not a FlexCache volume has global file locking mode enabled. Global file locking mode is a mode where protocol read locking semantics are enforced across all FlexCaches and origins of a FlexCache volume. When global file locking mode is enabled, the "is_disconnected_mode_off_for_locks" flag is always set to "true".

guarantee

guarantee

name

string

FlexCache name

origins

array[flexcache_relationship]

path

string

The fully-qualified path in the owning SVM's namespace at which the FlexCache is mounted. The path is case insensitive and must be unique within a SVM's namespace. Path must begin with '/' and must not end with '/'. Only one FlexCache be mounted at any given junction path.

prepopulate

prepopulate

FlexCache prepopulate

relative_size

relative_size

FlexCache Relative Size

size

integer

Physical size of the FlexCache. The recommended size for a FlexCache is 10% of the origin volume. The minimum FlexCache constituent size is 1GB.

svm

svm

FlexCache SVM

use_tiered_aggregate

boolean

Specifies whether or not a Fabricpool-enabled aggregate can be used in FlexCache creation. The use_tiered_aggregate is only used when auto-provisioning a FlexCache volume.

uuid

string

FlexCache UUID. Unique identifier for the FlexCache.

writeback

writeback

FlexCache Writeback
Name Type Description

_links

_links

uuid

string

The UUID of the asynchronous job that is triggered by a POST, PATCH, or DELETE operation.

error_arguments

Name Type Description

code

string

Argument code

message

string

Message argument

error

Name Type Description

arguments

array[error_arguments]

Message arguments

code

string

Error code

message

string

Error message

target

string

The target parameter that caused the error.