Examples which can occur while multiple processes running simultaneously

Technote (FAQ)


Question

When running "copy activedata" and "reclaim stgpool" processes simultaneously, "copy activedata" dealt with smaller number of files than expected. Is it an expected behavior?

Answer


It is mentioned in the Administrator's Guide manual
that running multiple processes simultaneously might lead to process termination
and it is recommended to avoid the situation if possible.
Some examples of unpredictable behaviors are shown in this technote.
It is needed to run the processes serially to avoid such situation completely.


Administrator's Guide "Managing server operations" says as follows:

When possible, avoid running simultaneous data movement or delete operations,
or running simultaneous storage pool data access operations. One or more of the
operations might terminate prematurely if the data involved in a data access
operation is also involved in a data movement operation.


Here are examples of unpredictable behaviors and
they are currently the result of working as designed.

Example 1.
When running "backup stgpool" and "reclaim stgpool" simultaneously,
both of them completed without any error.
However, the result of "backup stgpool" showed that the smaller number of files
than expected were dealt with.
Here are an exmample of the actlog entries.
It was expected that 5,000 files were dealt with in the process.

YY/MM/DD HH:MM:SS ANR0986I Process <PROCESS_NUMBER> for BACKUP STORAGE POOL running in the FOREGROUND processed 920 items for a total of 94,519,600 bytes with a completion state of SUCCESS at HH:MM:SS.


Example 2.
When running "copy activedata" and "reclaim stgpool" simultaneously,
both of them completed without any error.
However, the result of "copy activedata" showed that the smaller number of files
than expected were dealt with.
Here are an example of the actlog entries.
It was expected that 5,000 files were dealt with in the process.

YY/MM/DD HH:MM:SS ANR0986I Process <PROCESS_NUMBER> for COPY ACTIVEDATA running in the BACKGROUND processed 4,745 items for a total of 487,537,735 bytes with a completion state of SUCCESS at HH:MM:SS.
YY/MM/DD HH:MM:SS ANR1318I Copying active data from primary storage pool ACTIVEPOOL to active data pool ACTIVEPOOLCOPY has ended. Files Copied Up: 4745, Bytes Copied Up: 487537735, Unreadable Files: 0, Unreadable Bytes: 0.

Historical Number

33372
75731

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Document information


More support for:

Tivoli Storage Manager
Server

Software version:

Version Independent

Operating system(s):

Platform Independent

Software edition:

Edition Independent

Reference #:

1592451

Modified date:

2013-04-08

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