Create Volume

A volume is a logical concept composed of multiple metadata and data shards.

From the client's perspective, a volume can be seen as a file system instance that can be accessed by containers. A volume can be mounted in multiple containers, allowing files to be accessed by different clients simultaneously.
From the perspective of object storage, a volume corresponds to a bucket.

The following will introduce how to create volumes in different modes. For more volume operations, please refer to Volume Management api.

Create Replicated Volume

Request the master service interface to create a volume.

name: volume name
capacity: volume quota. If the quota is used up, it needs to be expanded.
owner: the owner of the volume. If there is no user with the same name as the owner in the cluster, a user with the user ID of Owner will be created automatically.

curl -v "http://127.0.0.1:17010/admin/createVol?name=test&capacity=100&owner=cfs"

Tip

Example of expanding the volume (where authKey is the MD5 value of the volume owner string).

curl -v "http://127.0.0.1:17010/vol/expand?name=test&authKey=57f0162b2303be3449c7008484b0d306&capacity=200"

If the Blobstore erasure-coded subsystem is deployed, you can create an erasure-coded volume to store cold data.

curl -v 'http://127.0.0.1:17010/admin/createVol?name=test-cold&capacity=100&owner=cfs&volType=1'

name: volume name
capacity: volume quota. If the quota is used up, it needs to be expanded.
owner: the owner of the volume.
volType: volume type. 0 for replicated volume, 1 for erasure-coded volume. The default is 0.

You can create an erasure-coded volume and set multiple replicas as read-write cache.

Cache read data

curl -v 'http://127.0.0.1:17010/admin/createVol?name=test-cold&capacity=100&owner=cfs&volType=1&cacheCap=10&cacheAction=1'

name: volume name
capacity: volume quota. If the quota is used up, it needs to be expanded.
owner: the owner of the volume.
volType: volume type. 0 for replicated volume, 1 for erasure-coded volume. The default is 0.
cacheCap: cache size in GB.
cacheAction: cache type. 0 for no cache, 1 for cache read, 2 for cache read-write. The default is 0.

Cache read and write data

curl -v 'http://127.0.0.1:17010/admin/createVol?name=test-cold&capacity=100&owner=cfs&volType=1&cacheCap=10&cacheAction=2'

name: volume name
capacity: volume quota. If the quota is used up, it needs to be expanded.
owner: the owner of the volume.
volType: volume type. 0 for replicated volume, 1 for erasure-coded volume. The default is 0.
cacheCap: cache size in GB.
cacheAction: cache type. 0 for no cache, 1 for cache read, 2 for cache read-write. The default is 0.

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