Re: How to predict which tapes will be mounted during rest

     OK, hate me if you must!

     This is why you perform your offsite backups via a second adsm server
     with its own 3494 by utilizing the server-to-server communication
     feature. (this way nothing is ever out of reach... my best/worst case
     is that critical data in Houston is copied to Chicago, in testing I
     backed up a file to disk, migrated it to tape, backed up the Houston
     Tx tape to its copy tape in Chicago Il, marked the Houston tape
     "unavailable" and issued a restore request... (oh and my client was in
     Tulsa Ok) talk about seeing the country side! I couldn't tell any
     difference than accessing the server in the same building, yes my test
     file was small and I would imagine doing 100GB would be slower.

     My motto is : "Never EVER take any tapes out of the/an ATL!"

     Really... think about it, you have 10GB raw data 30-ish GB user file
     space via compression.  How much data will go away when you drop that
     tape and it splits open and unrolls (and the spool only stops as it
     hits the wall 60 feet away).

     later,
           Dwight


______________________________ Reply Separator _________________________________
Subject: How to predict which tapes will be mounted during restore
Author:  GLiepin1 (GLiepin1 AT EXCHANGE.TELEKOM DOT LV) at unix,mime
Date:    2/1/99 10:42 AM


Hi ADSM gurus!

Is it posible to predict which tapes will be mounted during restore
operation ?
( I need to make a list of tapes,to bring the tapes from the secure offsite
archive,and
load them into 3494 library)
Currently ,the only way is to set library mountwait to 1 sec,run the ADSM
restore script
file by file and watch in the actlog for the tape mount requests.  It is a
_very_ slow way and this
has a serios impact to the library (3494) operation and can cause some
backup to fail
during this operation. Btw,it seems that if file is split between two tapes
error log will show
me only the first tape.
This way is ok if I need to restore a few files. But if I have a several
thousands of files ,archived
for several years,few thousands of tapes stored partially in the library and
partially offsite
this is a nightmare. ADSM must keep the information where the files are
stored
somewhere in his internal database,isn't it ? I simply *could* *not*
*believe* that there are no
smarter and easier way like to predict which tapes is necessary for restore.
Please answer me - is it possible or not ?

P.S. If the q content could display not only a filename ,but also an arhive
description,it could be
a solution. Unfortunately it can't do this.


------------------------------------------------------
Guntis Liepins
Guntis Liepins

Systems administrator ,LATTELEKOM SIA
tel. (+371) 7224199 mob. (+371) 9240376
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