05-21-2009
Any Way to pause/unpause system execution in HP-UX 11.11 and 11.23?
This may seem like an odd question, but I've heard that on old Alpha servers running OpenVMS, you could pause the system so that the OS is essentially suspended for a small period of time, then unpause it and it would pick up where it left off. During the pause, all CPU cycles would be halted, all i/o would be essentially dead. So I'm wondering if it's possible to do something like this on HP-UX 11.11 and 11.23.
My goal is to stop the systems from accessing or changing data on SAN hosted file systems long enough for me to get snapshots and then unpause the systems again. This would minimize our downtime for snapshots (to use for backup to tape). Since the file systems are on a SAN, the pause would not affect them. The reason I need to make sure that NO I/O happens is that all of the SAN hosted file systems are striped using LVM (for load balancing across the dual HBA and fiber paths to the SAN). I suspect that if even the most minute I/O happens while trying to make a snapshot in serial succession that the stripes would be out of sync and I'd have hosed snapshots.
So is there any way to do this, or am I dreaming?
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LEARN ABOUT DEBIAN
backintime
backintime(1) USER COMMANDS backintime(1)
NAME
backintime - a simple backup tool for Linux.
This is command line tool. The graphical tools are: backintime-gnome and backintime-kde4.
SYNOPSIS
backintime [ --backup | --backup-job | --snapshots-path | --snapshots-list | --snapshots-list-path | --last-snapshot | --last-snapshot-path
| --help | --version | --license ]
DESCRIPTION
Back In Time is a simple backup tool for Linux. The backup is done by taking snapshots of a specified set of folders.
All you have to do is configure: where to save snapshots, what folders to backup. You can also specify a backup schedule: disabled, every
5 minutes, every 10 minutes, every hour, every day, every week, every month. To configure it use one of the graphical interfaces available
(backintime-gnome or backintime-kde4).
It acts as a 'user mode' backup tool. This means that you can backup/restore only folders you have write access to (actually you can backup
read-only folders, but you can't restore them).
If you want to run it as root you need to use 'su'.
A new snapshot is created only if something changed since the last snapshot (if any).
A snapshot contains all the files from the selected folders (except for exclude patterns). In order to reduce disk space it use hard-links
(if possible) between snapshots for unchanged files. This way a file of 10Mb, unchanged for 10 snapshots, will use only 10Mb on the disk.
When you restore a file 'A', if it already exists on the file system it will be renamed to 'A.backup.currentdate'.
For automatic backup it use 'cron' so there is no need for a daemon, but 'cron' must be running.
user-callback
During backup process the application can call a user callback at different steps. This callback is "$XDG_CONFIG_HOME/backintime/user-
callback" (by default $XDG_CONFIG_HOME is ~/.config).
The first argument is the progile id (1=Main Profile, ...).
The second argument is the progile name.
The third argument is the reason:
1 Backup process begins.
2 Backup process ends.
3 A new snapshot was taken. The extra arguments are snapshot ID and snapshot path.
4 There was an error. The second argument is the error code.
Error codes:
1 The application is not configured.
2 A "take snapshot" process is already running.
3 Can't find snapshots folder (is it on a removable drive ?).
4 A snapshot for "now" already exist.
OPTIONS
-b, --backup
take a snapshot now (if needed)
--backup-job
take a snapshot (if needed) depending on schedule rules (used for cron jobs)
--snapshots-path
display path where is saves the snapshots (if configured)
--snapshots-list
display the list of snapshot IDs (if any)
--snapshots-list-path
display the paths to snapshots (if any)
--last-snapshot
display last snapshot ID (if any)
--last-snapshot-path
display the path to the last snapshot (if any)
-h, --help
display a short help
-v, --version
show version
--license
show license
SEE ALSO
backintime-gnome, backintime-kde4.
Back In Time also has a website: http://backintime.le-web.org
AUTHOR
This manual page was written by BIT Team (<bit-team@lists.launchpad.net>).
version 1.0.10 Mars 2009 backintime(1)