NDMP does'nt support multiple streams to single drive at a given point of time. 
 If you have multiple drives, you can send multiple streams (1 stream / device).

Rgds

- Krishnan

> -----Original Message-----
> From: Jack Lyons [mailto:jack.lyons AT MARTINAGENCY DOT COM]
> Sent: 26 March 2004 13:03
> To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
> Subject: Re: [Networker] Slow filer backups
> 
> 
> When you say NDMP doesn't support multiple streams.  Are you 
> saying that if
> there are two drives and two volumes, that I won't be able to 
> back them up
> simultaneously?
> 
> BTW, We are getting 1.2 TB backed up at an average of 21MB/s 
> to a single
> LTO-1 but we were planning on adding another drive when we 
> moved another
> 800GB to the filer, but it seems that I might not get any 
> improvement in
> speed.
> 
> -----Original Message-----
> From: Krishnan, Ramamurthy (Temp) 
> [mailto:Ramamurthy.Krishnan AT KPMG.CO DOT UK]
> Sent: Tuesday, March 16, 2004 3:44 AM
> To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
> Subject: Re: [Networker] Slow filer backups
> 
> Parallelism would have made some difference, of course.  But 
> since NDMP
> does'nt support multiple streams, we can't compare 
> hand-to-hand with NDMP
> and non-NDMP backup speeds.
> 
> Moreover in my case, out of the 12 drives not all are 
> producing 12MB/sec.
> I've seen some of those performing as low as 45-90Kb/sec, 
> which I think is
> unacceptable.  Isolating the bottle-neck, i guess, breaks the 
> nut here.
> 
> - Krishnan
> 
> -----Original Message-----
> From: Matthew Huff [mailto:mhuff AT OX DOT COM]
> Sent: 15 March 2004 18:40
> To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
> Subject: Re: [Networker] Slow filer backups
> 
> 
> Due to the nature of the ufsdump basis of the NetApp NDMP backup,
> 12MB/sec isn't bad. An optimized legato parallelized stream would be a
> different metric.
> 
> ----
> Matthew Huff           | One Manhattanville Rd
> Director of Operations | Purchase, NY 10577
> OTA LLC                | Phone: 914-460-4039
> http://www.otaotr.com  | Fax:   914-460-4139
> 
> > -----Original Message-----
> > From: Davina Treiber [mailto:Treiber AT hotpop DOT com]
> > Sent: Monday, March 15, 2004 1:10 PM
> > To: Legato NetWorker discussion; Matthew Huff
> > Subject: Re: [Networker] Slow filer backups
> >
> >
> > Matthew Huff wrote:
> > > 12MB/sec isn't really that bad for LTO-1 drives.
> >
> > That's a matter of opinion. I'd say it's a bit poor. The
> > native speed is
> > 15 or 16 MB/s depending on brand, and it's not even up to
> > that figure.
> > In a well configured environment I have seen sustained write
> > speeds of
> > 25-30 MB/s. That's what I call not bad.
> >
> >
> >
> >
> >
> >
> 
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