My understanding is that a "native" legato streamed backups use
checkpoints. Once a media error occurs, it attempts to write EOT then
restarts backup at the last checkpoint on the next media. You only loose
the time since the last checkpoint, where with NDMP you could be at 14
hours of a 15 hour backup and it fail and it starts over at the
beginning and you have another 15 hours to go.

----
Matthew Huff           | One Manhattanville Rd
Director of Operations | Purchase, NY 10577
OTA LLC                | Phone: 914-460-4039 
mailto:mhuff AT ox DOT com    | Fax:   914-460-4139    

> -----Original Message-----
> From: Faidherbe, Thierry [mailto:thierry.faidherbe AT hp DOT com] 
> Sent: Wednesday, February 11, 2004 2:48 PM
> To: Legato NetWorker discussion; Matthew Huff
> Subject: RE: [Networker] NDMP for NAS devices- do you like it?
> 
> 
> >The biggest gotcha is that with NDMP if a error occurs during the
> backup
> >it aborts the entire backup.
> 
> Yes but not only with NDMP. "Normal" NetWorker backups or using 
> modules are working in the same way. The behavior is "better" 
> on NDMP because only 1 backup session is impacted at a time 
> (no multiplexing on tape). Non-NDMP backups being multiplexed 
> on tape, you have the same or 
> more snowball effect on your backups.
> 
> HTH,
> 
> Thierry
> 
> 
> 
> 
> 
> Kind regards - Bien cordialement - Vriendelijke groeten,
> 
> Thierry FAIDHERBE
> 
> HP Services - Storage Division
> Tru64 Unix and Legato EBS Consultant
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> 
> -----Original Message-----
> From: Legato NetWorker discussion 
> [mailto:NETWORKER AT LISTMAIL.TEMPLE DOT EDU]
> On Behalf Of Matthew Huff
> Sent: Wednesday, February 11, 2004 5:55 PM
> To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
> Subject: Re: [Networker] NDMP for NAS devices- do you like it?
> 
> The biggest gotcha is that with NDMP if a error occurs during 
> the backup it aborts the entire backup. There is currently no 
> checkpointing. NetApp has proposed an extension for NDMP v4 
> to the IETF for restartable backups, but no one has 
> implemented it to my knowledge. It isn't in v7.1.1 of 
> Networker. This means if you have a media error at 1900GB of 
> a 2000GB backup, it aborts and starts over at byte 0. This 
> has been a big issue with us forcing us to move to a more 
> dependable media (exabyte
> M2-> IBM LTO-2) that also is less susceptible to "shoe-shining"
> 
> ----
> Matthew Huff           | One Manhattanville Rd
> Director of Operations | Purchase, NY 10577
> OTA LLC                | Phone: 914-460-4039 
> mailto:mhuff AT ox DOT com    | Fax:   914-460-4139    
> 
> > -----Original Message-----
> > From: Evan Gold [mailto:egold AT FSA DOT COM]
> > Sent: Wednesday, February 11, 2004 11:45 AM
> > To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
> > Subject: [Networker] NDMP for NAS devices- do you like it?
> > 
> > 
> > I am considering using NDMP to backup our NAS devices with
> > legato 7.1.1
> > 
> > is anyone using it?
> > it is easy to use and restore files?
> > what legato products do i need to buy to get started?
> > 
> > im backing up EMC, netapp and bluearc NAS devices.
> > 
> > thanks!
> > Evan
> > 
> > --
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> 

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