Re: [Networker] strange tape writing stats

No, our compression is pretty good.  With our already compressed
novell data we used to get 35GB on a DLT7000 tape.  We get 100 GB on
a tape now.

With other compressable data we've seen 300+ on a tape.

Make sure you have the correct quantum line in your st.conf?  I'm using:

##### DLT7000s and SDLT support #########
DLT7k-data      =       1,0x38,0,0xD639,4,0x82,0x83,0x84,0x85,2;
SDLT1           =       1,0x38,0,0x19639,4,0x90,0x91,0x90,0x91,3;


Umm, of course, I forgot LTO was called out here, not SDLT.

Robert Maiello
Thomson
Medical Economics


 -----Original Message-----
From:   Paul T. DAY [mailto:day AT deas.harvard DOT edu]
Sent:   Thursday, August 08, 2002 10:22 AM
To:     robert.maiello AT MEDEC DOT COM; howard.martin AT eds DOT com;
NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Cc:     Paul T. DAY
Subject:        Re: [Networker] strange tape writing stats

        Does anybody have problems with compression.  Its worse sometioms
(almost all tapes just use the rated 50G) and then gets better for a
while.

Paul
>
> Date: Thu, 8 Aug 2002 03:51:26 -0400
> From: Howard Martin <howard.martin AT EDS DOT COM>
> Reply-To: Legato NetWorker discussion <NETWORKER AT LISTMAIL.TEMPLE DOT EDU>,
>      Howard Martin <howard.martin AT EDS DOT COM>
> To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
> Subject: Re: [Networker] strange tape writing stats
>
> I've hit the same problem.
> NetWorker 6.1.1.Build.238 Enerprise Edition
> SunOS 5.7 E450
> DLT7000 and IBM LTO
> I find the nwadmin GUI under reports speeds by around 25% , the response
> from our Legato support company was that this was due to networker not
> polling the drives frequently, to increase the polling rate and improve
> accuracy was considered unlikely to be a high priority for Legato but I'm
> going to ask that a RFE is rasied for it.
>
>
> On Wed, 7 Aug 2002 13:26:07 -0400, Paul T. DAY <day AT DEAS.HARVARD DOT EDU>
wrote:
>
> >        When I look in nwadmin/nsrwatch, I see writing at about 4.5
meg/hr
> >yet when I do an iostat I see it writing/reading at just over 6 megs/hr.
> >Is this normal.  I also don't seem to be getting much compresion most of
> >the time.  Any ideas.
> >
> >NetWorker 6.1.1.Build.238 Power/110
> >SunOS nsrhost 5.8 Generic_108528-05 sun4u sparc SUNW,Ultra-80
> >Qualstar library with 7 AIT-2 drives
> >
> >Paul


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