Wouldn't the speed of the backup only be as fast as the slowest part of the backup environment?  If you are using gige, you might want to check out jumbo frames and full flow control.

Debbie

-----Original Message-----
From: Jerry [mailto:juanino@yahoo.com]
Sent: Tuesday, November 02, 2004 3:59 PM
To: Geoff Hardin; toasters
Subject: Re: Backup speeds across the network

It depends on your # and type of files.  In some cases
I get 13 MB/sec, but where I have lots of small files
I get as little as 1.5 MB/sec.  I am not bound by
network at that time either. (This is on super dlt-3
drives, ~22 MB/sec theoretical i believe).

Jerry

--- Geoff Hardin <geoff.hardin@dalsemi.com> wrote:

> We have several filers and few tape drives so we are
> looking at doing
> 3-way NDMP backups.  Right now, we are doing those
> backups to other
> filers, but this is consuming a lot of resources,
> especially on the tape
> host filer.  So, we are looking at a new tape
> library from SpectraLogic,
> Overland, Quantum, StorageTek, etc. that has the
> NDMP "built-in" to the
> tape drive. 
>
> Our question is, what kind of speeds are others
> seeing in their real
> environments?  Speaking to one vendor, they claimed
> their library would
> work at the rated tape speeds (35 MB/s), while
> another claimed even
> better performance (40 MB/s); to his credit, the
> second vendor said that
> he wasn't the technical guy, but he thought that's
> what he remembered.
>  Call me overly cynical, but I find it hard to
> believe that we will see
> speeds comparable to direct attached tape over the
> network.  Our
> experience in the past has been somewhere closer to
> 50% of the rated
> tape speed, and even that may be a bit overreaching
> for some of our
> older filers (F760C).
>
> Thanks,
>
> Geoff Hardin
> geoff.hardin@dalsemi.com
> UNIX System Administrator
> Maxim / Dallas Semiconductor
>
>

               
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