On Fri, 15 Sep 2006, Dan Langille wrote:
> Large volumes on *disk* slow down the restore if you're trying to get > one file back. GREATLY. Try it. I suggest smaller volumes. e.g. > 2GB. Yup, not only have I tried it, but it was question 1) in my original post. It doesn't make any sense, really. Files on disk can be lseek()'ed directly to the appropriate block, and the catalog really should contain the block within the volume to seek to. It should be instant. I am a bit confused as to why it is not. > > Consider you need a 30MB from somewhere in that 200GB file. Assume > it's 1/4 of the way through the volume. You must read 50GB before > you get to that file. Of course, it could be at 170GB through the > file... Either way, you don't want to wait all that time. > > Tape drives often have skip ahead functionality so this problem is > not always applicable to tape. > The equivalent "skip-ahead" for disk files is the lseek() system call... All that aside, it does make me queasy to have such large files on disk. All I need is for the filesystem to have an fsck problem and suddenly a months worth of backups are removed :) So I am looking into smaller volume sizes. Ideally I would have a different "file" volume written each night to the same disk with some kind of auto-labelling. Does anyone else do this? Then each "file" would just contain the backups run for that day. If the auto-labelling could include date information in the filename that would be even better still, as once the files in these volumes expire from the catalog I could come back later and know which volume I really want. I have also been planning to "archive" the volumes onto actual tape for eternal safekeeping... Am I approaching this the right way? I keep running across the comment that "if you try to use bacula and force backups to particular volumes you will be unhappy". The bright idea to dump tape and use detachable USB hard drives instead seems to be biting me in the ***. j ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
