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Duplicity -> S3 备份失败，出现“[Errno 105] 没有可用的缓冲区空间”

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Duplicity -> S3 备份失败，出现“[Errno 105] 没有可用的缓冲区空间”

我的 Ubuntu 10.04 VPS 上有一个夜间脚本，它使用表里不一（0.6.24）来运行增量加密备份到 Amazon S3。这个脚本一直运行良好，直到一个月前开始出现如下错误：

Upload 's3://s3.amazonaws.com/{BUCKET}/duplicity-full.20140519T222412Z.vol6.difftar.gpg' failed (attempt #5, reason: error: [Errno 105] No buffer space available)
Giving up trying to upload s3://s3.amazonaws.com/{BUCKET}/duplicity-full.20140519T222412Z.vol6.difftar.gpg after 5 attempts
Backend error detail: Traceback (most recent call last):
  File "/usr/local/bin/duplicity", line 1502, in <module>
    with_tempdir(main)
  File "/usr/local/bin/duplicity", line 1496, in with_tempdir
    fn()
  File "/usr/local/bin/duplicity", line 1345, in main
    do_backup(action)
  File "/usr/local/bin/duplicity", line 1466, in do_backup
    full_backup(col_stats)
  File "/usr/local/bin/duplicity", line 538, in full_backup
    globals.backend)
  File "/usr/local/bin/duplicity", line 420, in write_multivol
    (tdp, dest_filename, vol_num)))
  File "/usr/local/lib/python2.6/dist-packages/duplicity/asyncscheduler.py", line 145, in schedule_task
    return self.__run_synchronously(fn, params)
  File "/usr/local/lib/python2.6/dist-packages/duplicity/asyncscheduler.py", line 171, in __run_synchronously
    ret = fn(*params)
  File "/usr/local/bin/duplicity", line 419, in <lambda>
    async_waiters.append(io_scheduler.schedule_task(lambda tdp, dest_filename, vol_num: put(tdp, dest_filename, vol_num),
  File "/usr/local/bin/duplicity", line 310, in put
    backend.put(tdp, dest_filename)
  File "/usr/local/lib/python2.6/dist-packages/duplicity/backends/_boto_single.py", line 266, in put
    raise BackendException("Error uploading %s/%s" % (self.straight_url, remote_filename))
BackendException: Error uploading s3://s3.amazonaws.com/{BUCKET}/duplicity-full.20140519T222412Z.vol6.difftar.gpg

在发生错误之前，它似乎能够上传几个 duplicity 卷，如果我再次运行备份脚本，它会从上次中断的地方继续，这样我就可以完成备份，但我必须不断重新启动脚本，直到它完成 30 个卷。

我使用的 duplicity 命令是：

duplicity --full-if-older-than 1M \
      --encrypt-key={KEY} \
      --sign-key={KEY} \
      --exclude={PATH}
      {PATH} \
      s3://s3.amazonaws.com/{BUCKET} -v8

我怎样才能避免这个错误？

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