Nope. There is a real need to omit the "-w" switch. Look at Backup and
Restore Guide for Informix Dynamic Server:
"The onbar utility ignores the BAR_MAX_BACKUP parameter for a whole-system
backup or restore. Whole-system backups and restores are always serial."

Zlatko Krastev
IT Consultant





George Lesho <GLesho AT AFCE DOT COM> on 10.10.2001 22:10:37
Please respond to "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
To:     ADSM-L AT VM.MARIST DOT EDU
cc:

Subject:        Re: Parallel backup

Mr. Sachin, I believe that your maxsessions parameter will control the
number of simultaneous client sessions your server will handle but the
$ONCONFIG file for the Informix instance also contains an onbar parameter
that limits the number of backup streams (BAR_MAX_BACKUP). Ours looks as
follows:

(((cut from instance onconfig file)))
# Backup/Restore variables
# Edited 04/04/01 -gl
BAR_ACT_LOG     /tmp/bar_act_log.psoft
BAR_MAX_BACKUP  2
BAR_RETRY       3
BAR_NB_XPORT_COUNT 10
BAR_XFER_BUF_SIZE 15
BAR_BSALIB_PATH /usr/bmc/IFX/ibacktrack/lib/bsashr10.o
#BAR_DEBUG      7               #7 is level of verbosity on scale 0-9
05/03/2001 gl
#BAR_DEBUG_LOG  /tmp/dbg_bar.psoft

In addition, I see no need to specify onbar_d switch -w and -L0 as the
whole
system switch is at level 0 by default. It doesn't do any harm to keep it
though.

George Lesho
Storage/System Admin
AFC Enterprises







"Ganu Sachin, IBM" <Sachin.Ganu AT KWA2.SIEMENS.CO DOT IN>@VM.MARIST.EDU> on
10/10/2001 03:43:37 AM

Please respond to "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>

Sent by:  "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>


To:   ADSM-L AT VM.MARIST DOT EDU
cc:    (bcc: George Lesho/Partners/AFC)
Fax to:
Subject:  Parallel backup


> Hi
>
I want to take the Informix Database backup across 2 tape drives. I  mean
to
say that when i run the backup command it should write the data across two
tape drives. I heard it is possible through ADSM ( TSM), just you have to
add additional device to ur data pool. We are using the ADSM 3.7 and ADSM
3.7 version. we are using 3590 tape drive.  We have informix 7.24 UC3
running on AIX 4.3 server. The main aim to take the database backup across
2
tape drive is to reduce the backup & restoration time.  Anybody has
implemented such kind of backup method.

We are using ON-Bar command "onbar -b -w -L 0" and we want to take the
backup by this command as we restore the this database to backup site

Regards

Sachin