Server-Side Copy: Difference between revisions
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[[File:Traditional_copy.png]] |
[[File:Traditional_copy.png]] |
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'''Sequence''' |
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# Client issues read requests to server |
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# Server reads file data off disk |
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# Server sends data to client |
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# Client sends duplicate file data to server |
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# Server writes duplicate file data to disk |
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'''Result''' |
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* File data traverses network and disk |
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[[File:Serverside_copy.png]] |
[[File:Serverside_copy.png]] |
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'''Sequence''' |
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# Client issues FSCTL_SRV_COPYCHUNK requests to server |
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# Server reads file data off disk |
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# Server writes duplicate file data to disk |
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'''Result''' |
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* File data traverses disk only |
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** Network round trip avoided |
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[[File:Btrfs_serverside_copy.png]] |
[[File:Btrfs_serverside_copy.png]] |
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'''Sequence''' |
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# Client issues FSCTL_SRV_COPYCHUNK requests to server |
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# Server issues BTRFS_IOC_CLONE_RANGE filesystem ioctl |
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'''Result''' |
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* File data does '''not'' traverse network or disk |
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** Filesystem meta-data update only |
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* No duplication of file data |
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** Source and destination files share the same on disk data extents |
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Revision as of 13:30, 13 November 2013
Introduction
Samba 4.1.0 was the first release to ship with support for server-side copy operations via the SMB2 FSCTL_SRV_COPYCHUNK request. Clients making use of server-side copy support, such as Windows Server 2012, can experience considerable performance improvements for file copy operations, as file data need not traverse the network. This feature is enabled by default on the smbd file server.
Traditional File Copy
Prior to Samba 4.1.0, clients traditionally copied files by reading the source file data over the network and writing it back to the server through to the destination file on disk.
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Server-Side Copy
With Samba 4.1.0 and later, clients can offload copy operations to the server using Copy-Chunk requests. In processing such a request, the network round-trip is avoided.
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Btrfs Enhanced Server-Side Copy
Along with server-side copy support, a Btrfs specific Samba VFS Module was newly added with 4.1.0. This module improves the performance and efficiency of server-side copy operations on Btrfs backed shares, by using the Btrfs clone-range IOCTL.
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