Removed ^M from Libraries Post: 302231302

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Top Forums UNIX for Advanced & Expert Users Removed ^M from Libraries Post 302231302 by buffoonix on Tuesday 2nd of September 2008 04:55:08 AM

09-02-2008

Registered User

I never questioned that.
As the other poster already said, it's time to role the restore from the backup.
Just an aside,
if you (the thread issuer) like me have your filesystems on LVM volumes (yes I do have a separate lv_usr)
there is a neat feature that can be used for rolling back quickly from an unfortunate experiment like yours without even rolling a regular backup.
Before I do such dubious recursive substitutions I just would create a snapshot volume of the affected LV like

Code:

[root@toshsat:~]
# df /usr
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/vgfc-lv_usr
                       5160576   3193892   1704540  66% /usr
[root@toshsat:~]
# vgdisplay vgfc|egrep 'PE Size|Free  PE'
  PE Size               8.00 MB
  Free  PE / Size       11 / 88.00 MB
[root@toshsat:~]
# lvcreate -s -n snapof_usr -l 11 /dev/vgfc/lv_usr
  Logical volume "snapof_usr" created
[root@toshsat:~]
# lvs -o lv_name,lv_size,origin,snap_percent vgfc
  LV           LSize   Origin Snap% 
  lv_depot       9.80G              
  lv_home      512.00M              
  lv_opt       512.00M              
  lv_root        1.00G              
  lv_tmp       512.00M              
  lv_usr         5.00G              
  lv_usr_local 256.00M              
  lv_var         1.00G              
  snapof_usr    88.00M lv_usr   0.01

Above I only created a snapshot of 88 MB of the 5 GB /usr volume because I hadn't any more free PEs in my vgfc. Smilie

Normally, one would adapt this to the size of the snapped of LV and the anticipated amount of changes during the period one would possibly require the snapshot.
As a rule of thumb 10% suffice, but this depends on the changes in the filesystem.
Since /usr is pretty static (and even could be mounted ro often) there won't be many changes.
From the lvs command above you can watch the filling up of the snapshot with the changes.
Once the snap_percent approaches 100% your snapshot is useless and can't be any longer used for recoveries.
Now you can safely run your command.
If something goes wrong, you simply mount the snapshot volume ro somewhere and run your restore.
Once you no longer need your snapshot simply lvremove it.

Code:

[root@toshsat:~]
# mount -r /dev/vgfc/snapof_usr /mnt/tmp2
[root@toshsat:~]
# df /usr /mnt/tmp2
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/vgfc-lv_usr
                       5160576   3193892   1704540  66% /usr
/dev/mapper/vgfc-snapof_usr
                       5160576   3193892   1704540  66% /mnt/tmp2
[root@toshsat:~]
# umount /mnt/tmp2
[root@toshsat:~]
# lvremove -f /dev/vgfc/snapof_usr 
  Logical volume "snapof_usr" successfully removed

Last edited by buffoonix; 09-02-2008 at 06:03 AM..

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moosex::types::combine

MooseX::Types::Combine(3pm)				User Contributed Perl Documentation			       MooseX::Types::Combine(3pm)

NAME

       MooseX::Types::Combine - Combine type libraries for exporting

VERSION

       version 0.41

SYNOPSIS

	   package CombinedTypeLib;

	   use base 'MooseX::Types::Combine';

	   __PACKAGE__->provide_types_from(qw/TypeLib1 TypeLib2/);

	   package UserClass;

	   use CombinedTypeLib qw/Type1 Type2 ... /;

DESCRIPTION

       Allows you to export types from multiple type libraries.

       Libraries on the right end of the list passed to "provide_types_from" take precedence over those on the left in case of conflicts.

CLASS METHODS

   provide_types_from
       Sets or returns a list of type libraries to re-export from.

SEE ALSO

       MooseX::Types

LICENSE

       This program is free software; you can redistribute it and/or modify it under the same terms as perl itself.

AUTHOR

       Robert "phaylon" Sedlacek <rs@474.at>

COPYRIGHT AND LICENSE

       This software is copyright (c) 2007 by Robert "phaylon" Sedlacek.

       This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

perl v5.18.2							    2013-12-21					       MooseX::Types::Combine(3pm)