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| fzzf1 | hi vkmc, I have a question with manila replica.when I create replica,Can I choose a exist share as secondary share replica? | 11:27 |
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| fzzf1 | I want know if share and replica are the same concept.when I create replica,does it will create a new share as a secondary replica? it means share and replica is the same thing,isn't it? https://docs.openstack.org/manila/latest/admin/shared-file-systems-share-replication.html I find this from the page,when create replica, primary replica and secondary replica their share-id are the same | 11:37 |
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| dviroel | fzzf1: hi, one share can have multiple share instances, and when replication is enabled, each share instance has a replica state. So yes, they are part of the same share-id, but they have different instance-ids. | 11:49 |
| dviroel | fzzf1: when retrieving info from a share that has replicas, manila will provide you information from the active instance. Manila has a API for share instances that will retrieve info from all replicas. Manila also has a API to promote a replica to Active. | 11:52 |
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| fzzf2 | dviroel,one share can have multiple share instances,how it create. it sounds like replica is share sub-concept | 12:34 |
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| dviroel | fzzf2: so every share has at least one instance, the active one. Replicas are instances of a share, that can be writable, readable or a disaster-recovery copy. It will depend which type the vendor supports. So Manila will create a new instance every time that a new replica is requested. | 12:50 |
| fzzf2 | which command is query share instance? query share is using manila list,right? I can't understand the difference in share and share instance. | 12:59 |
| dviroel | fzzf2: manila share-instance-list | 13:01 |
| dviroel | fzzf2: share is the entity that represents a shared file system, with its characteristics, permissions and state. An instance is a physical shared volume at the storage. A replica is an instance too, i.e a copy in the storage system. | 13:02 |
| dviroel | 'manila share-instance-show $instance-id' will give more details about an instance, like 'replica_state' | 13:05 |
| dviroel | fzzf2: 'share-replica-list' will also show a list of instances, but will filter the ones that don't support replication. | 13:08 |
| fzzf2 | yes,I saw it,so replica create by one share is all instance, but use manila list only can see one share.and so secondary replica can't specify exist share or share instance | 13:13 |
| fzzf2 | dviroel,Will replica be updated on timej | 13:15 |
| dviroel | manila supports creation of new replicas only, you can't specify any existent share/instance as a replica of another share. If is what you were asking. | 13:20 |
| dviroel | the replica update time depends on the storage/driver that you are using. | 13:22 |
| fzzf2 | sorry,my description is not clear,it's it. | 13:24 |
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| fzzf2 | hi dviroel,I have another question plz :),Is command manage share must need the export path? as a user,maybe don't know which share is exist in backend,unless he is also the backend storage administrator. | 13:42 |
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| dviroel | fzzf2: hey, yes and it is expected to be an admin operation since it must know details about shares that exists in the backend. | 13:52 |
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| fzzf2 | ok,I get it.thank you very much! | 14:00 |
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| openstackgerrit | Merged openstack/puppet-manila master: Deprecate cephfs_enable_snapshots parameter https://review.opendev.org/745766 | 23:59 |
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