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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