On 1 June 2011 19:50, Gary Tully <gary.tu...@gmail.com> wrote: > yes, a restored backup would be recoverable. > > In creating a backup, there may be an issue with the lock file, or > with an inuse journal file. The lock file is not important but you > would want the latest journal files. > > Linux will allow you to freeze a filesystem, I guess other os's have > similar support. > http://rwmj.wordpress.com/2010/06/09/freezing-filesystems/ > > We may want to introduce a way to have activemq freeze the journal, > block reads/writes and release open journal and index files for OS's > that don't have freeze support.
Thanks Gary. Based on what you said I'm not sure that fsfreeze will guarantee a consistent journal by itself unless the journal is updated in a single atomic write. Is this the case? A user-space KahaDB snapshotting tool would certainly be useful regardless. Cheers, Steve
