ADSM-L

Re: [ADSM-L] Strange difference between Primary and Copypool

2007-12-12 08:03:26
Subject: Re: [ADSM-L] Strange difference between Primary and Copypool
From: "Loon, E.J. van - SPLXM" <Eric-van.Loon AT KLM DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Wed, 12 Dec 2007 14:02:03 +0100
Hi Andy!

I have 3 servers (LBU1, LBU2 and LBU3) running. Checkout their private
volume count:

DL_LBU1_CPY_1   Private 634
DL_LBU1_PRI_1   Private 643

DL_LBU2_CPY_1   Private 561
DL_LBU2_PRI_1   Private 564

DL_LBU3_CPY_1   Private 441
DL_LBU3_PRI_1   Private 366 

Notice that the figures on LBU1 and 2 look fine (the private volume
count on the primary pool is slightly larger than the copypool count)
but on the amount of private volumes for the copy pool of the LBU3
server is much (more than 20%!!) higher!
Kindest regards,
Eric van Loon
KLM Royal Dutch Airlines


-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Andy Huebner
Sent: dinsdag 11 december 2007 18:29
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: Strange difference between Primary and Copypool

I would say it is normal to have a little more data in the primary pool
due to on-going backups.  We have backups running all the time.
Since the primary and copy tapes are created differently I am not
surprised that there is a different number of tapes.  Has there always
been more copy than primary tapes?  I would think the tape count could
swing the other way.

Andy Huebner
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Loon, E.J. van - SPLXM
Sent: Tuesday, December 11, 2007 8:05 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] Strange difference between Primary and Copypool

Hi Jim!
My copy pool is an online copy pool. Tapes (in fact virtual tapes) are
not checked out, nor removed from the (virtual) library.
I didn't state that my copy pool is larger than the primary pool (hence
my line "although the copy pool (DL_LBU3_CPY_1) contains less data, it
uses more tapes!!!") and I also stated that both storage pools are
reclaimed at 60%... On a daily bases..
Kindest regards,
Eric van Loon
KLM Royal Dutch Airlines


-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Jim Young
Sent: dinsdag 11 december 2007 14:26
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: Strange difference between Primary and Copypool

Hi

My theory works if the following is true. 

1) the copy pool is offsite. 
2) your statement that the copy pool is larger than the primary pool was
incorrect. Its the other way round looing at the numbers given.

Original sizings
Storagepool MB
------------------ ---------------------------------
DL_LBU3_CPY_1 26489427.98
DL_LBU3_PRI_1 27658559.10

As the tapes onsite (in the library) can be mounted over and over again
putting new data at the end of the volume until full, you have a
non-tape wasting process, 

BUT 

The offsite tapes are created and then shipped offsite. The offsite
tapes can only be recreated from onsite data and as such, unless they
trigger the 60% free reclamation they will sit there until 40% utilized,
never defraging, just taking up lots of your lovely tapes.  Additional
waste can be caused by collocation as well. Not knowing if that is used
for nodes in this pool i cannot comment.  Plus we don't know the size of
files you are backing up against the size of the tapes. ie. a 36Gb
database file on a 40Gb DLT holds 90% of the tape.

I find this SQL useful for identifying tapes that get stuck and not
reclaimed.

    select volume_name, stgpool_name,pct_utilized, status from volumes -
    where pct_utilized < 40 and stgpool_name <>'DISKPOOL' -
    order by pct_utilized, stgpool_name, volume_name

Cheers

Jim 


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received this e-mail by error, please notify the sender immediately
by return e-mail, and delete this message. 

Koninklijke Luchtvaart Maatschappij NV (KLM), its subsidiaries
and/or its employees shall not be liable for the incorrect or
incomplete transmission of this e-mail or any attachments, nor
responsible for any delay in receipt.
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Dutch Airlines) is registered in Amstelveen, The Netherlands, with
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