Re: Does RSYNC work over NFS?
Beautifully. That's how I have been backing up our NetApp filer. Jacob On Tue, Sep 25, 2001 at 01:41:16PM -0700, Karl Kopper wrote: Does rsync work over an NFS mount? --Karl _ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp
Re: Does RSYNC work over NFS?
Yes, but remember that the rsync protocol is optimized for low bandwidth networks and high bandwidth disks. When you go over NFS you are increasing the access time for the disks, and especially if you are copying between two NFS mounts on the same machine you've got very high bandwidth for the network between the two sides. When you have a high bandwidth network, it is more efficient to disable the rsync rolling checksum algorithm with --whole-file, which increases the network traffic but decreases the disk traffic. That's the default in the rsync release that's currently being developed, when source and destination are on the same machine. Also, some people have reported some hangs when copying on NFS. It's unclear to me whether or not the no-hang patches that have been posted to this mailing list have helped. - Dave Dykstra On Tue, Sep 25, 2001 at 03:46:48PM -0500, Jacob Martinson wrote: Beautifully. That's how I have been backing up our NetApp filer. Jacob On Tue, Sep 25, 2001 at 01:41:16PM -0700, Karl Kopper wrote: Does rsync work over an NFS mount? --Karl _ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp
Re: Does RSYNC work over NFS?
yes, but I recommend you add the -W option, unless it's likely that you have a lot data changing within the files and a slow pipe. Tim Conway [EMAIL PROTECTED] 303.682.4917 Philips Semiconductor - Longmont TC 1880 Industrial Circle, Suite D Longmont, CO 80501 Available via SameTime Connect within Philips Available as n9hmg on AIM perl -e 'print pack(, 19061,29556,8289,28271,29800,25970,8304,25970,27680,26721,25451,25970), .\n ' There are some who call me Tim? Karl Kopper [EMAIL PROTECTED]@lists.samba.org on 09/25/2001 02:41:16 PM Sent by: [EMAIL PROTECTED] To: [EMAIL PROTECTED] cc: (bcc: Tim Conway/LMT/SC/PHILIPS) Subject: Does RSYNC work over NFS? Classification: Does rsync work over an NFS mount? --Karl _ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp
RE: Does RSYNC work over NFS?
Actually, there is a possible exception to that. Certainly, in my situation, I always use -W. Ours is mostly new files or deletions... rarely partial modifications of large single files. consider, however, a slow pipe between systems, one or more mounting filesystems via nfs over a fast connection. the lan connection to the nfs is negligible versus the rsync connection from server to server. We're on one side of that threshold here, with a switched 1000bT connection from our servers to our Network Appliances filers and T1 from server-to-server (1044kbps). Of course, we use slower-performing attached storage for our organization-wide-duplicated filesystems, so there's no question in our case... it's -W... especially when we duplicate to our local redundant fileservers. However, if we were using our netapps for our purpose, -W would slow us in some situations. Tim Conway [EMAIL PROTECTED] 303.682.4917 Philips Semiconductor - Longmont TC 1880 Industrial Circle, Suite D Longmont, CO 80501 Available via SameTime Connect within Philips Available as n9hmg on AIM perl -e 'print pack(, 19061,29556,8289,28271,29800,25970,8304,25970,27680,26721,25451,25970), .\n ' There are some who call me Tim? David Bolen [EMAIL PROTECTED]@lists.samba.org on 09/25/2001 05:08:58 PM Sent by: [EMAIL PROTECTED] To: [EMAIL PROTECTED] cc: (bcc: Tim Conway/LMT/SC/PHILIPS) Subject: RE: Does RSYNC work over NFS? Classification: [EMAIL PROTECTED] [[EMAIL PROTECTED]] writes: yes, but I recommend you add the -W option, unless it's likely that you have a lot data changing within the files and a slow pipe. I wouldn't even put any caveat on it. Since rsync is going to have to read the entire file anyway just to compute the block checksums necessary for its algorithm, you're assured that the entire file will flow across the NFS link no matter how much changed. So it really only makes sense to use -W and just copy the whole thing in the first place. To be honest, the only thing rsync offers over a straight copy over NFS is the recursive comparison of timestamp/size to determine files to copy. That might still be worth it, but you're definitely not going to get any benefit in terms of any delta computation. -- David /---\ \ David Bolen\ E-mail: [EMAIL PROTECTED] / | FitLinxx, Inc.\ Phone: (203) 708-5192| / 860 Canal Street, Stamford, CT 06902 \ Fax: (203) 316-5150 \ \---/
RE: Does RSYNC work over NFS?
[EMAIL PROTECTED] [[EMAIL PROTECTED]] writes: consider, however, a slow pipe between systems, one or more mounting filesystems via nfs over a fast connection. the lan connection to the nfs is negligible versus the rsync connection from server to server. Oh, I'd agree with that. But then to me you aren't running rsync over the NFS connection, but over the slow LAN connection. I took the original question to mean using rsync over an NFS connection serving as the link between source and destination (in which case only -W makes sense), but in re-reading the subject, it's a tad ambiguous and could certainly include the above scenario. -- David /---\ \ David Bolen\ E-mail: [EMAIL PROTECTED] / | FitLinxx, Inc.\ Phone: (203) 708-5192| / 860 Canal Street, Stamford, CT 06902 \ Fax: (203) 316-5150 \ \---/
