Re: Use tar to online backup has an error

On 2015-09-24 03:55, maxiangqian wrote:

> when I use tar to online backup ,It has an error:
>
> /bin/tar: Removing leading `/' from member names

This is not an error, more like a warning. GNU tar doesn't not store the full path in the tar file, but a relative path, as full paths are considered dangerous (easier to overwrite existing data by mistake).

> /bin/tar: /data/test/PG_9.0_201008051/20001/24500001: Cannot stat: No such
> file or directory
>
> /bin/tar: Error exit delayed from previous errors
>
>
> and /data/test/PG_9.0_201008051/20001/24500001 file is not exist.
>

It looks like you are trying to make a filesystem backup while the files are still being updated. In order to make a filesystem backup you need to either:

- shutdown the database
- run "pg_start_backup" (make SURE that you run pg_stop_backup" when done)

http://www.postgresql.org/docs/9.3/static/backup-file.html
http://www.postgresql.org/docs/9.3/static/continuous-archiving.html#BACKUP-TIPS

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