Hi,
We have splitted /var/opt/openmail/data into 10 filesystems and we do
snapshot for all of them + /var/opt/openmail at the same time during OM
is suspended. So the filesystems/OM database are/is consistent for the
whole backup time, which is ( we use HP OB II) about 10 hours full and
30 minutes per incremental backup.
At least we have been able to do multiple snapshot fs's concurrently.
There can be only one snapshot for one filesystem at the time.
We have about 3,5M files and it still about works, if OM ever does.
BTW, I would be interested about how long does the restoring of the OM
database with 2M files take with ADSM. We use OB becouse I can't get it
back fast enough with ADSM. The other reason is the number of files in
OM server, it would just explode the ADSM database. With OB I can
disable logging to OB database, so it will only keep track about which
volumes were used for backup and when and how long they are protected.
BR:
Timo
> Timo,
>
> true but you have to have a consistent FileSystem all the way through
the
> backup, which may last for more than 1 hour (up to 60GB of data, which
> for OpenMail means something like 2.000.000 files!), plus it is not
> possible to take a snapshot of several file systems at the same time.
>
> Ciao Mauro
>
> > Hi,
> >
> > If you use HP vxfs (OnlineJFS) snapshot feature, you need one lvol
per
> > fs, but you don't have to split your mirroring. Lvol size demand
> depends
> > on your system activity during the backup.
> >
> > OM can be suspended for a moment of doing snapshot i.e. about 60
-120
> > sec, so users see only their client to freese for a moment.
> > sec, so users see only their client to freese for a moment.
> >
> > Timo Heinonen
> > ++++++++++++++++
> >
> >
> > > "Mauro M. TINELLI" wrote:
> > > >
> > > > Werner,
> > > >
> > > > I backup three OM servers every night (17GB, 42GB and 66GB of
> > OMstore).
> > > >
> > > > On all of them, I:
> > > >
> > > > - stop the OM services,
> > > > - split the mirrored copy of the OM FSs,
> > > > - restart the OM services,
> > > > - backup incrementally the copy /var/opt/openmail,
> > > > /var/opt/openmal/data...
> > > >
> > > > and
> > > >
> > > > - finally I merge the FSs again!
> > > >
> > > > I do use incremental backup. The consistency is garanteed by the
> fact
> > > > that all the services have been stopped, before the splitting of
> the
> > FS.
> > > > By the way, I was using OmniBack-II before and I moved to ADSM
> > because
> > > > the "always incremental" policy reduces the backup time.
> > > >
> > > > It works ... and the restore too!
> > > >
> > > > Ciao Mauro
> > >
> > > Ciao Mauro
> > >
> > > Thanks a lot for your informations. How long have the OpenMail
> services
> > > to be down (how long are the servers not available)?
> > >
> > > Thank you for your info
> > > Regards
> > > Werner Nussbaumer
> > Timo Heinonen
> > Unix Team Manager Timo.Heinonen AT nmp.nokia DOT com
> > Nokia Mobile Phones Tel: +358 10 505 2364
> > PL 86 Fax: +358 10 505 2899
> > 24101 SALO GSM: +358 40 582 8806
> > FINLAND
> > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>
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