> From: "Jens Lang" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Friday, March 21, 2008 4:12 PM > Subject: [Dirvish] Full backup every time > > > what could be the reason that dirvish make a full backup every time I > > start the backup? I am running the lates Ubuntu on both, client and > > server.
On Fri, Mar 21, 2008 at 05:24:46PM -0400, Kenneth Lerman wrote: > It is supposed to. Ken's reply is true, but you might want a little more information than that. Dirvish uses rsync to create full and complete images. On the server disk, there should be a succession of complete images. Rsync uses unix/linux hard links to share data file information; if a file does not change, there may be many links to it, but it is only stored on the backup disk once. Thus, a 500GB disk can store what appears to be hundreds of 200GB images - only the changed files and the directory information is added for each successive image. For example, I have a 500GB backup disk with about 150 images on it, each apparently 200GB, and I have used only 350GB of it. By using the "branch" feature of dirvish, files that are identical on many different machines can also share data space. This is true in the ideal case. In reality, big files with little changes ( rotating-name logs, mbox mail folders, vmware images) will chew up disk pretty fast. Use "dateext" for logrotate, Maildir format for mail repositories, and samba links to linux filespace from smaller vmware images to minimize the big file changes getting backed up. Use dirvish-expire to manage storage. And look on the mailing list archives, the wiki, and the many FAQs and writeups created by other dirvish users for more hints. If after doing all these things, dirvish is creating huge images and not using hardlinks, filling up your backup disk too fast, there may be other problems. The helpful people on this list can help after you have made an effort characterize your problem. Welcome to dirvish! Keith -- Keith Lofstrom [EMAIL PROTECTED] Voice (503)-520-1993 KLIC --- Keith Lofstrom Integrated Circuits --- "Your Ideas in Silicon" Design Contracting in Bipolar and CMOS - Analog, Digital, and Scan ICs _______________________________________________ Dirvish mailing list [email protected] http://www.dirvish.org/mailman/listinfo/dirvish
