That is probably the best thing to do.

Thanks !
Bruno




                                                                                
                                    
                    Rockey Reed                                                 
                                    
                    <Rockey.Reed@ve       To:     "'Bruno.Bossier AT comparex 
DOT be'" <Bruno.Bossier AT comparex DOT be>         
                    ritas.com>            cc:                                   
                                    
                                          Subject:     RE: [Veritas-bu] Backing 
up a large amount of small files    
                    11/05/2002                                                  
                                    
                    05:15                                                       
                                    
                                                                                
                                    
                                                                                
                                    




OK Bruno, let's be honest here.  NBU as with all backup software
applications have difficulty with large quantities of small files.  This is
caused by the overhead required to catalog the files, retain metadata of
their locations on tape, etcetera.  A recommendation would be to look at
breaking the 150Gb into something like three 50GB chunks.  Do this in the
file selection using the * wildcard and streaming the data.  The file list
would look something like this:

NEW_STREAM
/path/a*
/path/b*
|
/path/g*
NEW_STREAM
/path/h*
|
/path/m*

down to /path/z*

To write to one drive set multiplexing in both the STU and the schedule and
set it to the number of streams.

HTH.

Thanks,
Rockey Reed

-----Original Message-----
From: Bruno.Bossier AT comparex DOT be [mailto:Bruno.Bossier AT comparex DOT be]
Sent: Monday, November 04, 2002 9:34 AM
To: David A. Chapa
Cc: veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Backing up a large amount of small files



All the data is on EMC via a SAN, so RAID-1.







                    "David A.

                    Chapa"               To:     Bruno.Bossier AT comparex DOT 
be

                    <david@datasta       cc:
veritas-bu AT mailman.eng.auburn DOT edu
                    ff.com>              Subject:     Re: [Veritas-bu]
Backing up a large amount of small files


                    10/30/2002

                    18:03









Well, I did see something like this at a client and I always found the best

solution to something like this is to just format the dang thing :-)

But Seriously now...

What RAID level, 5?

RAID5 is great for writes but not for reads, and with as many reads as you
need
done for this backup you would definitely hit timeouts.  This is exactly
the
problem one of my current clients is facing.

What about the last time SCANDISK was run?  We found a heavily fragmented
disk
caused these types of timeouts as well.

Some of the other things we tried was to break up the server backup at the
file
list.  This was a bit more labor intensive, but it did work to some degree.

HTH

David

Quoting Bruno.Bossier AT comparex DOT be:

> We have a server with a directory which contains over 3 million files for
a
> total amount of nearly 150 Gb. We are trying to back this up in a
> reasonable amount of time (12 to 14 hours maximum). OTM is enabled. We
have
> not succeeded so far. A lot of time is lost at the beginning of the
backup
> when the backup is going through the directory structure to check all
> files. This takes several hours. The first we already did until now is to
> set the maximum cache size to 0 (unlimited). This stopped the errors we
saw
> in the Windows eventlog when OTM is started and then aborted after 40
> minutes, then restarted again ....
>
> Can someone give some suggestions to speed up this backup ?
>
> Thanks,
> Bruno
>
>
> _______________________________________________
> Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
>







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