RE: Is a physical only whole backup possible?
Posted in 2000
Onbar aways initiates a logical log backup at the end of a whole system
(onbar -b -w) backup. However, you can perform a physical restore
with "onbar -r -w -p". After the restore completes, the Informix instance
will remain in "Fast Recovery" mode.
If you do not intend to apply
any logical logs, issue an "onmode -m" command. This command will
compleete the restore operation and bring the instance into "On-Line"
mode. However, this does not occur immediately. On our systems
this switch to "On-Line" has taken up to 20 minutes. Meanwhile I have
observed heavy I/O activity.
-----Original Message-----
From: aaronluz@my-deja.com
To: informix-list@iiug.org
Sent: 4/17/00 9:18 AM
Subject: Is a physical only whole backup possible?
I'm using IDS 7.31TC5 on Windows NT4. As an XBSA storage manager for
ONBar, I'm using the included ISM 2.20.
The Backup and Restore Guide states,
The advantage of using a whole-system backup is that you can restore
the storage spaces with or without the logical logs. Because the data
in all storage spaces is consistent in a whole-system backup, you do
not need to restore the logical logs to make the data consistent.
Given that I can restore a system to a previous physical state
using "onbar -r -p -w," is there a corresponding option to perform a
physical only whole backup?
I have tried "onbar -b -p -w," but ONBar only returns a command
synopsis. A physical only whole backup is possible by running
"onbar -b -w" while LTAPEDEV is set to NUL. However, the onbar process
returns error 131. According to the Backup and Restore Guide this
means "a failure occurred in the interface between ON-Bar and the
database server."
Is there a recommended way of performing a physical only whole backup
using ONBar? When error 131 is returned from "onbar -b -w," is there a
reliable method for determining if the physical portion of the backup
was performed successfully? If possible, I would like a method that
can be used within a Windows NT batch file.
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