>>>>> On Thu, 22 Jul 2010 14:37:22 -0600, May, John said:
>
> The point I was making with my original post was that the file restore of
> the 6.2TB of data is taking many times longer than it did to back it up.
> For instance, I started the backup last Friday 7/22 and it still isn't
> finished today, only about half-finished. If the original backup time was
> 37 hours, shouldn't the restore time be about the same or around the same
> time, not 10 times longer?
Yes, if the hardware is working optimally. Restore doesn't use spooling
though, so it can trigger shoe-shining more easily that backup.
__Martin
> -John
>
> -----Original Message-----
> From: Martin Simmons [mailto:martin AT lispworks DOT com]
> Sent: Thursday, July 22, 2010 1:51 PM
> To: bacula-users AT lists.sourceforge DOT net
> Subject: Re: [Bacula-users] Bacula 5.0.2 restore files from tape very slow
>
>>>>> On Thu, 22 Jul 2010 08:51:58 -0600, May, John said:
> >
> > Bacula says the durantion for the job was 36:49:03 to backup 6.2TB.
> >
> > So, the time it takes to backup the job affects the time it takes to
> > restore?
>
> No, but both times are affected by the size of the job. But isn't that
> obvious? Maybe I misunderstood your question.
>
> __Martin
>
>
> > -John
> >
> > -----Original Message-----
> > From: Martin Simmons [mailto:martin AT lispworks DOT com]
> > Sent: Thursday, July 22, 2010 5:50 AM
> > To: bacula-users AT lists.sourceforge DOT net
> > Subject: Re: [Bacula-users] Bacula 5.0.2 restore files from tape very slow
> >
>>>>> On Wed, 21 Jul 2010 13:59:34 -0600, May, John said:
> > >
> > > As far as I know it was running at about 70MB/s. It could have been
> > > shoe-shining a bit though, not really sure.
> >
> > 600GB at 70MB/s would only take 2.5 hours so it can't have been getting that
> > at a sustained rate. Shoe-shining sounds like a real possibility.
> >
> >
> > > -John
> > >
> > > -----Original Message-----
> > > From: Martin Simmons [mailto:martin AT lispworks DOT com]
> > > Sent: Wednesday, July 21, 2010 1:26 PM
> > > To: bacula-users AT lists.sourceforge DOT net
> > > Subject: Re: [Bacula-users] Bacula 5.0.2 restore files from tape very slow
> > >
>>>>> On Mon, 19 Jul 2010 07:50:41 -0600, May, John said:
> > > >
> > > > Monday morning, 3 days later and it is still restoring. It's finished
> > > > about
> > > > 600GB, which is less than half of what is on the two tapes. I'm pretty
> > > > sure
> > > > that only one job was written to the tape at the time of backup. Also,
> > > > I
> > > > thought 'bextract' would be faster than a normal restore, since I'm
> > > > telling
> > > > it restore everything on tape, and not just individual jobs. Is there
> > > > anyway I can speed this up? Next up is an 8TB restore, and I dread to
> > > > think
> > > > how long that will take.
> > >
> > > Do you know how the tape drive was functioning during the restore? Was it
> > > continually repositioning the tape (shoe-shining)? That would happen if
> > > Bacula (or the target filesystem) was unable to keep up with the speed at
> > > which the drive was sending data.
> > >
> > > __Martin
> > >
> > >
> > > >
> > > > John
> > > >
> > > > -----Original Message-----
> > > > From: May, John [mailto:john.may AT fugrohorizons DOT com]
> > > > Sent: Friday, July 16, 2010 7:52 AM
> > > > To: bacula-users AT lists.sourceforge DOT net
> > > > Subject: Re: [Bacula-users] Bacula 5.0.2 restore files from tape very
> > > > slow
> > > >
> > > > >Hi John... Is it possible that the backup job you are trying to
> > > > >restore from
> > > > >was running at the same time as other backup jobs were running (eg:
> > > > >concurrent
> > > > >jobs enabled)?
> > > > >
> > > > >If yes, then what might be going on here is that several jobs from
> > > > >several
> > > > >clients were written to the tape at the same time, and the data from
> > > > >each job
> > > > >was "interleaved", so the write to tape during the backup was fast,
> > > > >but now
> > > > >the trade-off is that restores will be slow since the tape drive needs
> > > > >to read
> > > > >parts of the files it wants to restore, skip the files from other
> > > > >servers/jobs, lather, rinse, repeat.
> > > > >
> > > > >It could also explain the initial fast restore of some data as it is
> > > > >possible
> > > > >that this particular backup job you are trying to restore was "already
> > > > >in
> > > > >progress" when the other started so it had full access to the storage
> > > > >and it
> > > > >was the only one writing to the tape.
> > > > >
> > > > >Something to consider.
> > > >
> > > > Well, this was an archive job and I ran it during the day when no other
> > > > backups were running. Also, I have Bacula configured to only write a
> > > > single job to each tape for the archive pool (Maximum Volume Jobs = 1).
> > > >
> > > > John
> > > >
> > > > -----Original Message-----
> > > > From: Bill Arlofski [mailto:waa-bacula AT revpol DOT com]
> > > > Sent: Thursday, July 15, 2010 7:06 PM
> > > > To: bacula-users AT lists.sourceforge DOT net
> > > > Subject: Re: [Bacula-users] Bacula 5.0.2 restore files from tape very
> > > > slow
> > > >
> > > > On 07/15/10 14:07, May, John wrote:
> > > > > I am using Bacula 5.0.2 using MySQL on Centos 5.4 x64. I'm trying
> > > > > to restore some files from a backup I made a couple months ago. I
> > > > > the restore is about 1.5 TB in size and spans two LTO4 tapes. I can
> > > > > start the restore just fine and the first 5GB flies by in a minute or
> > > > > so, then the restore sort of stalls and starts crawling. It slows
> > > > > down to about 1MB/s down from about 70MB/s. There are only about
> > > > > 15,000 files on the tapes and I am restoring to a local Raid 0 array.
> > > > >
> > > > > I tried to bextract the files with and without a bootstrap file and
> > > > > the speed is still very slow. I also verified I have the correct the
> > > > > indexes in Mysql and I compacted the database.
> > > > >
> > > > > At this rate, I don't think the restore will finish, because it is
> > > > > going so slow.
> > > > >
> > > > > Any ideas on what's going on?
> > > > >
> > > > > -- John
> > > >
> > > >
> > > > Hi John... Is it possible that the backup job you are trying to restore
> > > > from
> > > > was running at the same time as other backup jobs were running (eg:
> > > > concurrent
> > > > jobs enabled)?
> > > >
> > > > If yes, then what might be going on here is that several jobs from
> > > > several
> > > > clients were written to the tape at the same time, and the data from
> > > > each job
> > > > was "interleaved", so the write to tape during the backup was fast,
> > > > but now
> > > > the trade-off is that restores will be slow since the tape drive needs
> > > > to read
> > > > parts of the files it wants to restore, skip the files from other
> > > > servers/jobs, lather, rinse, repeat.
> > > >
> > > > It could also explain the initial fast restore of some data as it is
> > > > possible
> > > > that this particular backup job you are trying to restore was "already
> > > > in
> > > > progress" when the other started so it had full access to the storage
> > > > and it
> > > > was the only one writing to the tape.
> > > >
> > > > Something to consider.
> > > >
> > > > --
> > > > Bill Arlofski
> > > > Reverse Polarity, LLC
> > > >
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