I just sent a separate message with the subject "How NW cloning &
multiplexing REALLY works." It contains the results of my tests that
show how NW really deals with cloning and multiplexing. SUMMARY: At
least in 7.3, it always preserves multiplexing unless you force it not
to do so by specifying one saveset at a time via the GUI or nsrclone.
This includes group cloning/automatic cloning, saveset cloning via the
GUI or the command line, or volume cloning.
---
W. Curtis Preston
Author of O'Reilly's Backup & Recovery and Using SANs and NAS
VP Data Protection
GlassHouse Technologies
-----Original Message-----
From: networker-bounces AT backupcentral DOT com
[mailto:networker-bounces AT backupcentral DOT com] On Behalf Of
ingo AT visionet DOT de
Sent: Friday, January 19, 2007 7:18 AM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: Re: [Networker] Does cloning unmuliplex and make recovery
faster?
We are sometimes doing an
'mminfo -q <tell me what I want> -r ssid | nsrclone -f <pool> -S -f -'
By the way, I always believed, cloning *would always* demultiplex; we
usualy
do automatic cloning after savegroup finish, and sometimes during
cloning
you can see the source tape wind forward (presumably searching the next
records of *the* saveset being cloned at that moment) and backward
(presumably after having finished cloning one saveset and picking up the
next saveset on the worklist). Once I have some time left, I will have a
closer look at the file and record positions.
Ingo
On Fri, 19 Jan 2007 09:58:46 -0500, George Sinclair
<George.Sinclair AT NOAA DOT GOV> wrote:
>rader AT GINSENG.HEP.WISC DOT EDU wrote:
>
>> > > I find it hard to believe that cloning preserves multiplexing,
it's my
>> > > understanding that nsrclone goes one by one, SSID to the next
SSID
>> > > cloning each singly before moving on to the next
>>
>> > It doesn't need to do that (at least not in the situations I've
used
>> > it), and it's very easy to test.
>> >
>> > Instead of copying one ssid at a time, it can maintain a list of
ssids.
>> > As it streams a source volume, data from any matching ssid is
copied to
>> > a destination volume. This has the big benefit of requiring only a
>> > single pass on a source volume.
>>
>>And so for many years we've been semi-manually doing something like...
>>
>> BEGIN='05Jan07 2359'; END='06Jan07 2359'
>> QUERY="'!incomplete,level=full,'savetime>$BEGIN,savetime<$END"
>> mminfo -r ssid -q "$QUERY" > ssidlist
>> nsrclose -S `cat ssidlist`
>>
>>Is there a better way these days?
>>
>>
>>
>How about just nsrclose -b pool -S -f ssidlist
>
>>steve
>>- - -
>>systems & network manager
>>high energy physics
>>university of wisconsin
>>
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>>
>>
>>
>
>
>--
>George Sinclair - NOAA/NESDIS/National Oceanographic Data Center
>SSMC3 4th Floor Rm 4145 | Voice: (301) 713-3284 x210
>1315 East West Highway | Fax: (301) 713-3301
>Silver Spring, MD 20910-3282 | Web Site: http://www.nodc.noaa.gov/
>- Any opinions expressed in this message are NOT those of the US Govt.
-
>
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