do a search for rdiff-backup http://rdiff-backup.stanford.edu/
it's written in python, and requires a library install as well (it's easy to install, I was able to do it on RH7.2) It creates both an incremental and a mirror. It was designed for WAN use. I have it set to make a local mirror 3x a day. It is really nice with UV files, especially T30's, in that it will only copy what has changed in the file. For us, each backup run takes about 40 minutes (apx 30gb of data) but it's great that we can keep a mirror for direct copying back, or save all previous versions for archival copying back (like, I would really like to have the file as it was 5 days ago). It uses ssh for it's WAN connection for secure data transmissions. George >-----Original Message----- >From: [EMAIL PROTECTED] >[mailto:[EMAIL PROTECTED] >Sent: Thursday, September 02, 2004 12:40 PM >To: [EMAIL PROTECTED] >Subject: RE: [U2] Anyone have experience "mirroring" a HDD over a WAN > > > You can do that with rsync on *nix. Only the changed bits of files are >transferred. There are other remote sync tools, just do a >google for it. I >wouldn't rely on the sync'd data, except as a 'last-resort >backup', if the >local copy folds up completely. It's not a good idea to try and keep a >remote instantly live. The local copy can be rebuilt from >off-site sources >very quickly, using the same tools. For local hot-swap action and >redundancy, refer to your neighborhood SATA or SCSI RAID >vendor. 1 is the >cheapest solution, while 10 is the best for overall error proofing and >reliability. Also, 10 spans across multiple spindles before >mirroring, so >your throughput can be decreased significantly from that of a >RAID-1 setup. > >http://graphics.adaptec.com/pdfs/ACSP_RAID_Ch4.pdf > >Glen >http://picksource.com > >> -----Original Message----- >> From: [EMAIL PROTECTED] >> [mailto:[EMAIL PROTECTED] Behalf Of >Dennis Bartlett >> Sent: Thursday, September 02, 2004 9:20 AM >> To: [EMAIL PROTECTED] >> Subject: [U2] Anyone have experience "mirroring" a HDD over a WAN >> >> >> Anyone have experience "mirroring" a HDD over a WAN? >> >> We have a scenario where triggers were going to be the "data >collection" >> and >> a "distribution" program to blow extracted data to various end of the >> earth. >> >> All this was an attempt to maintain a 24/7 access to a >working system. >> = All log on to the main server and work as at present. >> = When comms break at any branch, they log into their >own server and >> continue to work (the data being an exact copy of that >on the HO >> server up until the night before >> = synchronization to take place at night, when network traffic is >> lowest) >> >> >> We've now had to abandon triggers, moving to a scenario >where we get to >> modify source code (not a preferred route). This has caused >us to stop >> and think... if this can go wrong, how much more the distribution of >> data onto every server at every branch (20 branches, plus HO). >> >> An alternative solution is to set up a hardware mirror to handle the >> movement of data. A google produces an overwhelming array of >choices... >> >> What does the collective authority of the list say? >> >> >> <PRE> >> --------------------------------------------------------- >> GWK BEPERK/LIMITED (REG: 1997/022252/06) >> POSBUS 47 PO BOX 8730 >> DOUGLAS >> >> Direkteure/Directors: NB Jacobs, FJ Lawrence, J v/d S Botes, >> JH Coetzee, JGD Smit, JF Jacobs, AO M|ller, JW Smit, >> JP Snyman, JG Stander, JH van Dyk(MD/BD), JG Jacobs, A >M|ller, M van Zyl, >> Sekr/Secr: E van Niekerk. >> >> Hierdie e-pos is onderworpe aan 'n vrywaring beskikbaar by: >> http://www.gwk.co.za/DisclaimerVrywaring.asp >> This e-mail is subjected to the disclaimer that can be viewed at: >> http://www.gwk.co.za/DisclaimerVrywaring.asp</PRE> >> ------- >> u2-users mailing list >> [EMAIL PROTECTED] >> To unsubscribe please visit http://listserver.u2ug.org/ >------- >u2-users mailing list >[EMAIL PROTECTED] >To unsubscribe please visit http://listserver.u2ug.org/ ------- u2-users mailing list [EMAIL PROTECTED] To unsubscribe please visit http://listserver.u2ug.org/
