Networker

Re: [Networker] Why can't legato restore files the same way it backs them up?

2003-07-16 14:10:36
Subject: Re: [Networker] Why can't legato restore files the same way it backs them up?
From: Yura Pismerov <ypismerov AT TUCOWS DOT COM>
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Date: Wed, 16 Jul 2003 14:10:32 -0400
It is very good to know ! Also judging other posts I previously read
regarding the restoration speed it looks like this became a default
behavior in version 7 ? People say the restorations are a way faster in
the new version. Can somebody confirm that Networker 7 uses multiple
tapes during the restoration ?


Robert Maiello wrote:
>
> A perfectly acceptable question...
>
> You can create the empty file /nsr/debug/striped_recover  which will mount
> position and then read several tapes at once during your recover.
>
> Two limitations I found to this (Networker 6.1.2):
>
> a. If your recover spans more tapes than the number of drives you have it
> won't work..it wants to load and position all the tapes before starting the
> recover.
>
> b. Support from Legato is nil for this type of recover.
>
> That said,  some people running version 7 may be able to confirm that it,
> indeed, does this type of recover??
>
> Robert Maiello
> Thomson Healthcare
>
> On Wed, 16 Jul 2003 13:10:09 -0400, Jody Gregersen
> <Jody.Gregersen AT VISHAY DOT COM> wrote:
>
> >Hi all,
> >I'm having trouble trying to figure out why legato can't reverse engineer
> >the way it backs up files to the way it restores files.  Why can't they set
> >it up to read from the same amount of tapes as it writes to?  Are they
> >planning to add this to the code at any time?  Basically what I'm asking is
> >that if it writes in streams, why can't it read in streams?  I've been
> >recovering 500 gig of data for the last 2 days and I have to turn around and
> >do it again as soon as this one's done.  I understand that the parallelism
> >and target sessions during the backup can be optimized for a restore but
> >then it would take me 48 hours to back up the data.
> >Thanks for any input,
> >Jody
> >
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--
Yuri Pismerov, Sr. System Administrator,
TUCOWS.COM INC. (416) 535-0123  ext. 1352

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