Geez...I also thought it de-muxed the original data and wrote
consecutive blocks. That's why I think this list is such a great
resource.

I just compared an "original" tape with its "clone" and the datablocks
are virtually the same in terms of interleaving.

I was hoping my clone tapes would recover "faster" than the original.

I know that I can still achieve that if I want to clone all ssid's for
one particular client one-at-a-time.

I'm going to try the "staging" concept --> then clone to tape --> then
clone the clone tape (for verification) and finally send the "verified"
tape offsite for disaster recovery protection.

Thanks all...

Dale

-----Original Message-----
From: Joel Fisher [mailto:jfisher AT WFUBMC DOT EDU] 
Sent: Wednesday, April 23, 2003 8:55 AM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: Re: [Networker] Merits of cloning versus dual backups?

Doh... That's what I was looking for... I didn't even think about mminfo
being able to return that data.

I just checked a couple of my clone volumes and there is indeed
interleaving on those volumes.

Thanks GDM!!!

Joel

-----Original Message-----
From: Giles Malet - IST [mailto:gdmalet AT IST.UWATERLOO DOT CA] 
Sent: Wednesday, April 23, 2003 9:39 AM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: Re: [Networker] Merits of cloning versus dual backups?

"Tarjei T. Jensen" <tarjei.jensen AT KVAERNER DOT COM> writes:
> The story we have been told is that cloning untangles the savesets and
> optimizes them for recover.

I heard that too, didn't trust it, and simply listed a tape. Do
something like:

# mminfo -av \
 
-r'volume,cloneid,mediafile,mediarec,client,name,fragsize,sumsize,totals
ize' \
      yourclonevolume

and take note of the file/record numbers, and the fact that you'll see
duplicated client/name/cloneids, due to the interleaving. For example,
for a tape created by listing an original tape, gathering all the
ssids into a file, and then running `nsrclone -f file ..' I see the
following (having trimmed the above command a bit):

# mminfo -av -r'volume,cloneid,mediafile,mediarec,client,name,fragsize'
240516 | head -20
 volume           clone id file  rec client    name
size
240516          1051083189    2    1 lagavulin /files6
6584 MB
240516          1051086778    2    1 soar      /datasets
3960 MB
240516          1051086187    2    1 sun580    /fsys1
1925 MB
240516          1051079822    2    1 sunwise   /usr1
213 MB
240516          1051083509    2    1 temagami  /home
1846 MB
240516          1051087831    2    1 thunderbox /u2
1181 MB
240516          1051084462    2    1 tyrant    /fsys2
4303 MB
240516          1051080556    2    1 uwcfd     /export/home
187 MB
240516          1051082754    2    1 uwdepot   E:\
4156 MB
240516          1051083189    3    0 lagavulin /files6
6645 MB
240516          1051087831    3    0 thunderbox /u2
1202 MB
240516          1051084462    3    0 tyrant    /fsys2
4354 MB
240516          1051082754    3    0 uwdepot   E:\
4197 MB
240516          1051086187    3    1 sun580    /fsys1
1943 MB
240516          1051083509    3    1 temagami  /home
1864 MB
240516          1051080556    3    4 uwcfd     /export/home
188 MB
240516          1051086778    3    6 soar      /datasets
4026 MB
240516          1051079822    3   58 sunwise   /usr1
214 MB
240516          1051083189    4    0 lagavulin /files6
6697 MB

There's some obvious interleaving there. Note lagavulin for example.

Perhaps some other command causes the interleaving to be removed? That
would make cloning real slow.

gdm

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