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/
