Re: [Networker] Merits of cloning versus dual backups?

Thanks for that Terry.

Further questions if I may ask.

When I script using nsrclone I use
    mminfo (query here generating ssid's )  |nsrclone (options) -
i.e reading from stdin.
My view of the behaviour seen implies this will demultiplex the data.
Is this correct?


Also will nsrclone -f file demultiplex or not?

If I can modify the scripts used to not demulitplex I can see many happy 
clients.

Kit


On 23 Apr 2003 at 14:49, Terry Clayton wrote:

> After checking a couple of internal Legato sources to be quite certain the
> algorithm is as follows...
>
> nsrclone SSID1, SSID2, SSID3.....SSIDX  will move data from the source to
> the target without any change to the data and no tape thrashing.....
>
> If a tape has 4 savesets interleaved, the data chunks are moved
> in order and laid down exactly without any de-deinterleaving - and then
> re-interleaving the data.
>
> If you want to de-interleave the data then:
>
>          nsrclone SSID1
>          nsrclone SSID2
>          nsrclone SSID3
>          nsrclone SSID4
>
> In this case the data is read and written one save set at a time
> and the source  tape is repositioned accordingly, while the target tape
> device has the savesets sequentially written. and of course it takes 4 times
> as long to complete than the previous case.
>
> > -----Original Message-----
> > From: Kit Cunningham [mailto:kc AT IT-ASSIST.CO DOT NZ]
> > Sent: Wednesday, April 23, 2003 2:31 PM
> > To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
> > Subject: Re: [Networker] Merits of cloning versus dual backups?
> >
> >
> > I just ran scanner -v over one of my clone volumes. My
> > reading of the information given is the
> > savesets are multiplexed. See below. (Solaris, v6.1.1 networker)
> >
> > I also see the the unexpected end messages mentioned in
> > another post. (This tape is a good
> > tape.) These seem to cause a repeated E(nd) message for that saveset.
> >
> > A myth shatterred perhaps?
> > Hello legato people - Someone want to comment on this?
> >
> > Kit
> >
> >
> > .......................
> > scanner: ssid 392871937: found beginning of l4f:SYSTEM STATE:\
> > scanner: ssid 392866817: found beginning of u4f:/
> > scanner: scanning file 2, record 100
> > scanner: ssid 392877825: found beginning of 4f:C:\
> > scanner: scanning file 2, record 200
> > scanner: scanning file 2, record 300
> > l4f          SYSTEM STATE:\      12/13/01  3:44  f   6395896     10
> > 392871937 E
> > scanner: scanning file 2, record 400
> > scanner: scanning file 2, record 500
> > scanner: scanning file 2, record 600
> > scanner: ssid 392887297: found beginning of l4f:REPAIRDISK:\
> > scanner: ssid 392871937 unexpected end
> > l4f          SYSTEM STATE:\      12/13/01  3:44  f   6395896     10
> > 392871937 E
> > l4f          REPAIRDISK:\        12/13/01  3:45  1         4      0
> > 392887297 E
> > scanner: scanning file 2, record 700
> > scanner: scanning file 2, record 800
> > scanner: ssid 392891905: found beginning of l4f:C:\
> > scanner: scanning file 2, record 900
> > scanner: scanning file 2, record 1000
> > scanner: ssid 392887297 unexpected end
> > l4f          REPAIRDISK:\        12/13/01  3:45  1         4      0
> > 392887297 E
> > scanner: scanning file 2, record 1100
> > 4f           C:\                 12/13/01  3:48  1  25177520    529
> > 392877825 E
> > scanner: scanning file 2, record 1200
> > scanner: ssid 392913665: found beginning of
> > u4f:index:b1b7cd75-00000004-
> > 3af63b2e-3af63b2c-00030000-c6060614
> > scanner: ssid 392877825 unexpected end
> > 4f           C:\                 12/13/01  3:48  1  25177520    529
> > 392877825 E
> > u4f
> > index:b1b7cd75-00000004-3af63b2e-3af63b2c-00030000-c6060614
> > 12/13/01  3:36  1    295848     11 392913665 E
> > scanner: scanning file 2, record 1300
> > scanner: scanning file 2, record 1400
> > scanner: ssid 392913665 unexpected end
> > u4f
> > index:b1b7cd75-00000004-3af63b2e-3af63b2c-00030000-c6060614
> > 12/13/01  3:36  1    295848     11 392913665 E
> > u4f          /                   12/13/01  3:33  1   5168940    206
> > 392866817 E
> > scanner: scanning file 2, record 1500
> > scanner: scanning file 2, record 1600
> > scanner: scanning file 2, record 1700
> > scanner: scanning file 2, record 1800
> > scanner: scanning file 2, record 1900
> > scanner: scanning file 2, record 2000
> > scanner: scanning file 2, record 2100
> > scanner: ssid 392866817 unexpected end
> > u4f          /                   12/13/01  3:33  1   5168940    206
> > 392866817 E
> > scanner: scanning file 2, record 2200
> > scanner: scanning file 2, record 2300
> > scanner: scanning file 2, record 2400
> > scanner: scanning file 2, record 2500
> > scanner: scanning file 2, record 2600
> > scanner: scanning file 2, record 2700
> > scanner: scanning file 2, record 2800
> > scanner: scanning file 2, record 2900
> > scanner: scanning file 2, record 3000
> > scanner: scanning file 2, record 3100
> > scanner: scanning file 2, record 3200
> > scanner: scanning file 2, record 3300
> > scanner: scanning file 2, record 3400
> > scanner: scanning file 2, record 3500
> > scanner: scanning file 2, record 3600
> > scanner: scanning file 2, record 3700
> > scanner: scanning file 2, record 3800
> > scanner: scanning file 2, record 3900
> > scanner: scanning file 2, record 4000
> > scanner: scanning file 2, record 4100
> > scanner: scanning file 2, record 4200
> > scanner: scanning file 2, record 4300
> > scanner: scanning file 2, record 4400
> > scanner: scanning file 2, record 4500
> > scanner: scanning file 2, record 4600
> > scanner: scanning file 2, record 4700
> > scanner: scanning file 2, record 4800
> > scanner: scanning file 2, record 4900
> > scanner: scanning file 2, record 5000
> > scanner: scanning file 2, record 5100
> > scanner: scanning file 2, record 5200
> > scanner: scanning file 2, record 5300
> > scanner: scanning file 2, record 5400
> > scanner: scanning file 2, record 5500
> > l4f          C:\                 12/13/01  3:45  1 143911040   7624
> > 392891905 E
> > scanner: Opened /dev/rmt/1cbn for read
> > scanner: scanning file 3, record 0
> > scanner: ssid 414985985: found beginning of 4f:SYSTEM STATE:\
> > scanner: scanning file 3, record 100
> > scanner: scanning file 3, record 200
> > scanner: ssid 414990593: found beginning of l4f:SYSTEM STATE:\
> > 4f           SYSTEM STATE:\      12/14/01  3:47  f   8242848     12
> > 414985985 E
> > scanner: ssid 414985985 unexpected end
> > 4f           SYSTEM STATE:\      12/14/01  3:47  f   8242848     12
> > 414985985 E
> > scanner: scanning file 3, record 300
> > scanner: ssid 414996225: found beginning of 4f:C:\
> > scanner: ssid 414985729: found beginning of u4f:/
> > scanner: scanning file 3, record 4
> > ................
> >
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++++++++++++++++++++++++++++++++++++++++++++++++
Kit Cunningham - idata Limited
Mobile  +64 21 448 444   email: k.cunningham AT idata.co DOT nz
Support Calls to:  0800 backup -         0800 222 587
Support email: support AT idata.co DOT nz
http://www.idata.co.nz
++++++++++++++++++++++++++++++++++++++++++++++++

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Note: To sign off this list, send a "signoff networker" command via email
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