SCP 是否鎖定它正在傳輸的文件？

有一種情況，我們有一個應用程序日誌位於 AIX 伺服器上。日誌不斷地從應用程序寫入，我們在 Windows 上有使用者想要查看該文件。他們一直在做的是使用 WinSCP 將文件傳輸到他們的桌面，然後使用文本編輯器打開它。

我認為可能發生的是 scp 在傳輸期間鎖定文件，並且應用程序不再能夠寫入文件。我認為這是日誌文件將在一天中的隨機時間點停止增長的原因。

這可能是怎麼回事？

你為什麼不試試這個。開始 scp’ing 一個大文件，然後lsof /path/to/file在 AIX 伺服器上執行並查看 FD 列的內容。

從 lsof 手冊頁：

   FD         is the File Descriptor number of the file or:
                   cwd  current working directory;
                   Lnn  library references (AIX);
                   err  FD information error (see NAME column);
                   jld  jail directory (FreeBSD);
                   ltx  shared library text (code and data);
                   Mxx  hex memory-mapped type number xx.
                   m86  DOS Merge mapped file;
                   mem  memory-mapped file;
                   mmap memory-mapped device;
                   pd   parent directory;
                   rtd  root directory;
                   tr   kernel trace file (OpenBSD);
                   txt  program text (code and data);
                   v86  VP/ix mapped file;
              FD is followed by one of these characters, describing the mode under which the file is open:
                   r for read access;
                   w for write access;
                   u for read and write access;
                   space if mode unknown and no lock
                        character follows;
                   `-' if mode unknown and lock
                        character follows.
              The mode character is followed by one of these lock characters, describing the type of lock applied to the file:
                   N for a Solaris NFS lock of unknown type;
                   r for read lock on part of the file;
                   R for a read lock on the entire file;
                   w for a write lock on part of the file;
                   W for a write lock on the entire file;
                   u for a read and write lock of any length;
                   U for a lock of unknown type;
                   x for an SCO OpenServer Xenix lock on part of the file;
                   X for an SCO OpenServer Xenix lock on the entire file;
                   space if there is no lock.
              See the LOCKS section for more information on the lock information character.
              The FD column contents constitutes a single field for parsing in post-processing scripts.

如果你這樣做，至少在 Linux 上，你會看到 FD 列是“3r”，這意味著它有某種讀鎖，但我不確定它前面的 3 是什麼意思。

引用自：https://serverfault.com/questions/119574