Subject | Re: [firebird-support] nBackup tests |
---|---|
Author | Paul Vinkenoog |
Post date | 2007-02-21T00:28:53Z |
Hi Alex,
here. Nbackup doesn't promise you any magic. It just claims to be able
to back up databases "at hardware speed" - which is true.
time it takes. The slower the system, the more time it takes. The more
processes you have competing for disk access... etc. etc.
I suggest you try it out with a database that has the kind of size
that *you* are likely to use, on *your* hardware.
If it takes 1,5 hours to nbackup such a database, then hourly backups
are indeed impossible (unless you upgrade your hardware).
If it takes nbackup 1,5 hours and a straight file copy (make sure
there are no connections, or use nbkackup -l) is done in 15 minutes,
then there's a problem with nbackup.
Did you also read Sean's comments on the page?
Greetings,
Paul Vinkenoog
> I've read these comments about nbackup performance:I really don't understand why Dmitri chooses to use the word "myth"
> http://ibdeveloper.blogspot.com/2007/01/new-nbackup-or-online-dump-myth.html
here. Nbackup doesn't promise you any magic. It just claims to be able
to back up databases "at hardware speed" - which is true.
> So, I'd like to ask you about experiences using this tool. Is thatIt depends on what you call slow. The bigger the database, the more
> slow on big databases?
time it takes. The slower the system, the more time it takes. The more
processes you have competing for disk access... etc. etc.
I suggest you try it out with a database that has the kind of size
that *you* are likely to use, on *your* hardware.
If it takes 1,5 hours to nbackup such a database, then hourly backups
are indeed impossible (unless you upgrade your hardware).
If it takes nbackup 1,5 hours and a straight file copy (make sure
there are no connections, or use nbkackup -l) is done in 15 minutes,
then there's a problem with nbackup.
Did you also read Sean's comments on the page?
Greetings,
Paul Vinkenoog