The sun machine is a E250.  LTO is LTO-1 in an ATL P7K library.  We are'nt 
using compression and the average backup time runs to more than double of what 
you specify.  

Thanks

- Krishnan

-----Original Message-----
From: Howard Martin [mailto:howard.martin AT EDS DOT COM]
Sent: 11 March 2004 15:10
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: Re: [Networker] Slow filer backups


On Thu, 11 Mar 2004 13:49:17 -0000, Krishnan, Ramamurthy (Temp)
<Ramamurthy.Krishnan AT KPMG.CO DOT UK> wrote:

>Hi all
>
>We have a set of NetApp 840 Filers that are connected to a ATL P7K through
>a Gigabit switch.  NetWorker 6.1.3 runs on Solaris 8.  The total backup
>size on an avg. is ~2TB a day.  The backups do run but are too slow.  All
>the 12 LTO drives of the library won't exceed 12Mb/s speed.  The lowest
>being 90Kb/s.
>
>Is it a normal show?  Is there some way by which I can improve the
>transfer speed, so backups finish faster?  Any help is appreciated.
>
>TIA
>
>- Krishnan
>
which make of LTO?
what hardware is the Legato server - number and type of HBA ?
what is your maximum total throughput ?

Legato GUI on solaris under reports speed by ~25% so you might be getting
streaming speeds although if you are you're not getting much compression
(you are using compression ?).
If you only have one gigabit link then the max throughput is ~ 100MBytes/sec
which only keep ~7 drives streaming. If the Sun hardware is not Ultrasparc
III at 900MHz plus it's unlikely you would get 100MBytes out of a Gigabit
network anyway.
How long does it take to backup 2 TB on this setup best time to backup
would be ~6 hours.

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