Hi all
Environment:
AIX version 5.2 on IBM pSeries 670 partitioned with 6 processors for
this node DWH (datawarehouse as client for TSM)
TSM Storage agent version 5.2.1.x backing up to TSM server on IBM p630
also running AIX 5.2
Informix version 9.31 64bit
TDP for informix version 5.2
IBM LTO 3584 tape library with 8 drives FC connected to TSM serevr and
Storage agent server
We have recently experienced the following problem when backing up
Informix to TSM via lanfree:
Backup throughput times are very erratic, anything between 7 hours
(normal) TO 24HRS.
What we have discovered is that informix is starting the backup and
running 4 sessions to 4 tape drives but after awhile (and only
sometimes) the backup changes to one stream when this happens then we
find that informix still has four onbar_d process running (these are the
processes that are forked when an onbar backup is kicked off) but only
one of these streams is actually backing up data to TSM. There are no
errors reported on either TSM, AIX or Informix ( I have checked
dsierror.log, actlog, bar_actlog etc) these process also utilise a large
amount of CPU (above 80%). These processes initially backup data but
when the backup completes the process does not, this results in informix
not starting additional process since the bar_max_backup parameter in
onconfig is set to 4 .... So we have three rogue process, one process
actually performing a backup stream and single streaming of more than
1.5TB of data.
Sometimes these rogue processes vary between 1 and 4 i.e. 1,2 or 3 rogue
processes.
My assessment is that there is some form of miscommunication between
onbar, TSM TDP (API) and the TSM Storage agent and that when the backup
has completed onbar does not know and continues the process but does not
send data. The strange thing is that when this server had it own TSM
server locally installed and was connected to 6 Magstart 3575 tape
drives this would not happen but since changing t to lanfree this has
started, so my gut feel is that it is somehow connected to the storage
agent.
Has anyone seen this or shed some light on what may be happening. Any
help appreciated..
Kind Regards
Marc Layne
Faritec
Services Delivery and Software Solutions Manager
Tel: +27 21 762 9702
Fax: +27 21 762 9737
Cell: + 27 82 416 9086
Website: www.faritec.com
E-mail: mlayne AT faritec DOT com
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