Unless, of course, you originally wrote to disk. This is where Staging comes
in. As data is written to disk sequentially. So it does not take 4 times as
long as you do not have to rewind the tape, and start again.
Shaun Ellis
NetWorker Management & OpenVMS Product Manager
-----Original Message-----
From: Terry Clayton [mailto:tclayton AT legato DOT com]
Sent: Wednesday, April 23, 2003 2:49 PM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: RE: [Networker] Merits of cloning versus dual backups?
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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Note: To sign off this list, send a "signoff networker" command via email
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Note: To sign off this list, send a "signoff networker" command via email
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