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Diffstat (limited to 'qemu-doc.texi')
| -rw-r--r-- | qemu-doc.texi | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/qemu-doc.texi b/qemu-doc.texi index 5b36004873..dfea4d3799 100644 --- a/qemu-doc.texi +++ b/qemu-doc.texi @@ -1081,11 +1081,16 @@ tools only use MD5 to print fingerprints). Currently authentication must be done using ssh-agent. Other authentication methods may be supported in future. -Note: The ssh driver does not obey disk flush requests (ie. to commit -data to the backing disk when the guest requests it). This is because -the underlying protocol (SFTP) does not support this. Thus there is a -risk of guest disk corruption if the remote server or network goes -down during writes. +Note: Many ssh servers do not support an @code{fsync}-style operation. +The ssh driver cannot guarantee that disk flush requests are +obeyed, and this causes a risk of disk corruption if the remote +server or network goes down during writes. The driver will +print a warning when @code{fsync} is not supported: + +warning: ssh server @code{ssh.example.com:22} does not support fsync + +With sufficiently new versions of libssh2 and OpenSSH, @code{fsync} is +supported. @node pcsys_network @section Network emulation |