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Top Forums UNIX for Advanced & Expert Users 2 File transfer problems since time change on Nov 6th Post 302576162 by madmax123 on Thursday 24th of November 2011 12:23:57 AM
Old 11-24-2011
2 File transfer problems since time change on Nov 6th

We are in a hosting environment.Everyday a FTP server on client side follows predefined schedules to get files from a file server on hosting side.

On the file server, the files are originally saved in /data folder; after the remote FTP server gets them, the files will be moved to /archive folder, while the filenames will have timestamps appended to show the time that the files were successfully processed by the FTP server.

Everything was ok until the next day of time change which was Nov 6th. Starting from Nov 7th, in the /data folder, we start to see files like .nfsxxxx. They have the same size as the good data files, accumulating in both file server and FTP server, consume a lot of space and we don't know whether there is any impact to the data files. We did do homework on those NFS files, but as far as we know, there is no known process or userid trying to open the files while they are being transferred by FTP server. We also can't figure out why the problem happened right after time change.

The 2nd problem happened since yesterday. The client FTP server can no longer get data files. The log shows "No Such File". However, on hosting side, the files were moved to /archive with a timestamp as if they were moved successfully by FTP server.

Below are what happened before the problem, hopefully can give some clue:
1. On client side, on Nov 6th, the date configuration related to the FTP transfer cycle was modified so that the transfer time is the same after time change. E.g., file was transferred at 6:00am before the time change; file is still transferred at 6:00am after the time change. We did the same config change twice on Nov 2010 and March 2011, no problems.

2. On hosting side, things usually are not transparent to us. We only know the file server is a Solaris. We requested to use "lsof" against a .nfsxxxx file, the result pointed to a kernel patch 144488-17 performed on Oct 16th.

Now no one admits it's their problem. My theory is that the kernel patch doesn't work correctly somehow after the time change but I can't prove it. I did review the patch details but can't tell what could be the potential problem.

If anyone can give advice, especially on the 2nd problem, I greatly appreciate.

Thanks in advance.
Max
 

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ftpservers(4)							   File Formats 						     ftpservers(4)

NAME
ftpservers - FTP Server virtual hosting configuration file SYNOPSIS
/etc/ftpd/ftpservers DESCRIPTION
The ftpservers file is used to configure complete virtual hosting. In contrast to limited virtual hosting, complete virtual hosting allows separate configuration files to be specified for each virtual host. The set of configuration files for each virtual host are placed in their own directory. The ftpservers file associates the address of each virtual host with the directory its configuration files are stored in. The virtual host configuration files must be named: ftpaccess Virtual host's access file ftpusers Restricts the accounts that can use the virtual host ftpgroups Virtual hosts enhanced group access file ftphosts Allow or deny usernames access to the virtual host ftpconversions Customize conversions available from the virtual host You do not need to put every file in each virtual host directory. If you want a virtual host to use the master copy of a file, then do not include it in the virtual host directory. If the file is not included, the master copy from the /etc/ftpd directory will be used. The file names must match exactly. If you misspell any of them or name them differently, the server will not find them, and the server will use the master copy instead. The ftpaddhost utility is an administrative tool to configure virtual hosts. See ftpaddhost(1M). File Format There are two fields to each entry in the ftpservers file: address directory-containing-configuration-files For example: 10.196.145.10 /etc/ftpd/virtual-ftpd/10.196.145.10 10.196.145.200 /etc/ftpd//virtual-ftpd/10.196.145.200 some.domain INTERNAL When an FTP client connects to the FTP Server, in.ftpd(1M) tries to match the IP address to which the FTP client connected with one found in the ftpservers file. The address can be an IPv4 or IPv6 address, or a hostname. If a match is found, The FTP server uses any configuration files found in the associated directory. If a match is not found, or an invalid directory path is encountered, the default paths to the configuration files are used. The use of INTERNAL in the example above fails the check for a specific directory, and the master configuration files will be used. Either the actual IP address or a specific hostname can be used to specify the virtual host. It is better to specify the actual IP of the virtual host, as it reduces the need for a domain lookup and eliminates DNS security related naming issues, for example: 10.196.145.20 /etc/ftpd/config/faqs.org/ ftp.some.domain /etc/ftpd/config/faqs.org/ Lines that begin with a # sign are treated as comment lines and are ignored. FILES
/etc/ftpd/ftpservers ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWftpr | +-----------------------------+-----------------------------+ |Interface Stability |External | +-----------------------------+-----------------------------+ SEE ALSO
ftpaddhost(1M), in.ftpd(1M), ftpaccess(4), ftpconversions(4), ftpgroups(4), ftphosts(4), ftpusers(4), attributes(5) SunOS 5.10 1 May 2003 ftpservers(4)
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