ADSM-L

Re: "backup stgpool" command

1997-06-11 18:17:11
Subject: Re: "backup stgpool" command
From: David Ong <david AT BABYONG.NSC DOT COM>
Date: Wed, 11 Jun 1997 15:17:11 -0700
Ron,
This is true if one only does 'backup stgp' for tape pools. However, it is
perfectly valid to backup a disk storage pool first and then the tape pool
to conceivably cut down on the number of tape mounts.

At 04:16 PM 6/11/97 -0500, you wrote:
>Bob,
>Typically, a tape pool is the type of pool that gets copied by 'backup
>stgpool'.  If a node is being backed up, the data is probably going to
>the disk pool, so, no, the files would not even be considered for
>copying.  This is not a problem though.  Think of 'backup stgpool' as an
>ongoing process.  Tomorrow, after the files migrate to the tape pool,
>they WILL be copied. And even if some files were in-flight to the tape
>pool being backed up and (due to internal logic) they were not copied -
>rest assured they would be at the next 'backup stgpool'.
>
>Ron Clendenny
>Callaway Nuclear Plant
>Fulton, Missouri
><rdclendenny AT cal.ue DOT com>
>
>> -----Original Message-----
>> From: Siska, Bob [SMTP:BSISKA AT NCS DOT COM]
>> Sent: Wednesday, June 11, 1997 4:45 PM
>> To:   ADSM-L AT VM.MARIST DOT EDU
>> Subject:      "backup stgpool" command
>>
>> How does the "backup stgpool" command work internally? In what
>> sequence does
>> it select data for copying? Will it include client backups that are
>> done
>> while the "backup stgpool" is running?
>> For example, if FileA from Node1 has already been copied, and Node1
>> backs up
>> FileA again while the "backup stgpool" is still running, is FileA
>> copied
>> again (the newer version)?
>> Is it any problem if nodes are backed up while the "backup stgpool" is
>> running? It seems to me that the major problem would be if the "backup
>> stgpool" finished while a node was being backed up.
>> What do you folks think?
>>
>> Bob Siska
>> National Computer Systems
>> Iowa City IA
>> Bob_Siska AT ncs DOT com
>>  ----------
>
>

Have a nice day or whatever's left of it.

David Ong
National Semiconductor Corp.
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