slavkap commented on issue #6836:
URL: https://github.com/apache/cloudstack/issues/6836#issuecomment-1285873500
hi @GutoVeronezi, here're my results on the manual copy with the `pv` command
```
[root@lab-cs-dev-a2-block 434b557d-e974-3b78-b593-d813b5279b7a]# pv
b7d586ce-ef58-4e0c-963b-b26e4ead3756 > snapshots/testtransfer
10,1GiB 0:03:04 [55,7MiB/s]
[===================================================================================================================================================================>]
100%
```
and manual snapshot with CS
>
> 2022-10-20 18:54:42,136 DEBUG [kvm.storage.KVMStorageProcessor]
(agentRequest-Handler-3:null) (logid:b46b35b9) Pool
[{"uuid":"434b557d-e974-3b78-b593-d813b5279b7a","localPath":"\/mnt\/434b557d-e974-3b78-b593-d813b5279b7a"}]
has enough available size [47788851200] to take volume
[{"name":"b7d586ce-ef58-4e0c-963b-b26e4ead3756","path":"\/mnt\/434b557d-e974-3b78-b593-d813b5279b7a\/b7d586ce-ef58-4e0c-963b-b26e4ead3756","size":10795139072}]
snapshot.
> 2022-10-20 18:54:42,263 DEBUG [kvm.storage.KVMStorageProcessor]
(agentRequest-Handler-3:null) (logid:b46b35b9) Snapshot
[e6d9d9eb-48ee-4167-aaa6-74b402a8baa3] took [0] seconds to finish.
> 2022-10-20 19:16:06,750 DEBUG [kvm.storage.KVMStorageProcessor]
(agentRequest-Handler-3:null) (logid:b46b35b9) Copied
volumeTO[uuid=b7d586ce-ef58-4e0c-963b-b26e4ead3756|path=b7d586ce-ef58-4e0c-963b-b26e4ead3756|datastore=PrimaryDataStoreTO[uuid=434b557d-e974-3b78-b593-d813b5279b7a|name=nfs|id=7|pooltype=NetworkFilesystem]]
snapshot from
[/mnt/434b557d-e974-3b78-b593-d813b5279b7a/b7d586ce-ef58-4e0c-963b-b26e4ead3756]
to
[/mnt/434b557d-e974-3b78-b593-d813b5279b7a/snapshots/e6d9d9eb-48ee-4167-aaa6-74b402a8baa3].
in my case, the Files.copy() invokes [sun.nio.fs.UnixCopyFile.transfer(int,
int,
long)](https://github.com/AdoptOpenJDK/openjdk-jdk11/blob/master/src/java.base/unix/native/libnio/fs/UnixCopyFile.c#L53)
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