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I'm using Renci SSH.NET library for secure ftp connection. Now I have to check free disk space available on remote SFTP server. How can I do this?

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    @leemo SFTP is not FTP and has nothing in common with it. SFTP version 6 lets one check available space on the volume.
    – Eugene Mayevski 'Callback
    Commented Nov 4, 2013 at 18:08
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    OpenSSH SFTP server supports the [email protected] extension that returns that information.
    – salva
    Commented Nov 5, 2013 at 14:16

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As Eugene commented, SFTP protocol actually have an API to check available space (SSH_FXP_EXTENDED request name space-available defined in draft-ietf-secsh-filexfer-extensions-00).

But Renci SSH.NET library does not support the extension. Also worth noting that most SSH/SFTP servers (notably OpenSSH, as the one the most widespread) do not support this extension either. So client-side support won't help much here.

As Salva has commented, OpenSSH on the other hand supports [email protected] proprietary extension with very similar functionality as space-available. And Renci SSH.NET library supports that too (via SftpClient.GetStatus). So if you are sure that you work against OpenSSH server, you can use that.

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