Backup script calculating which type to run Post: 302441380

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Top Forums Shell Programming and Scripting Backup script calculating which type to run Post 302441380 by methyl on Friday 30th of July 2010 11:57:57 AM

07-30-2010

Registered User

Quote:

For arguments sake it is Saturday 7th January 2012 which is day 7 of the year. It is a leap year. The last monthly backup was run 28 days ago, on the 10th December 2011 which is day 344 of the year (Handy day of the year calculator). The script adds 28 to this, to create the nxtbkup variable to get 372. Since it is a leap year it minuses 366 from this to get 6. Although this value should be 7. The script returns a weekly backup which should be a monthly one. Change the minus from 366 to 365? Well as far as I can work out the minus 366 needs to come in somewhere but I can't get my head around where or how it should come in. So I'm stuck! But apart from this, everything seems to work fine.

I think that when you have incremented by 28 and your new value is greater than the number of days in last year you need to subtract the number of days in last year because the current year is now 2012.
In your example the 366 days will come into play when the incremented value rolls over into 2013 (by which time the current date must be in 2013).

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vgcfgbackup

VGCFGBACKUP(8)                                                System Manager's Manual                                               VGCFGBACKUP(8)

NAME

       vgcfgbackup - backup volume group descriptor area

SYNOPSIS

       vgcfgbackup [-d|--debug] [-f|--file filename] [-h|--help] [--ignorelockingfailure] [-P|--partial] [-v|--verbose] [VolumeGroupName...]

DESCRIPTION

       vgcfgbackup  allows you to backup the metadata of your volume groups.  If you don't name any volume groups on the command line, all of them
       will be backed up.

       In a default installation, each volume group gets backed up into a separate file bearing the name of the  volume  group  in  the  directory
       /etc/lvm/backup.   You can write the backup to an alternative file using -f.  In this case if you are backing up more than one volume group
       the filename is treated as a template, and %s gets replaced by the volume group name.

       NB. This DOESN'T backup user/system data in logical volume(s)!  Backup /etc/lvm regularly too.

OPTIONS

       See lvm for common options.

SEE ALSO

       lvm(8), vgcfgrestore(8)

Sistina Software UK                                      LVM TOOLS 2.02.95(2) (2012-03-06)                                          VGCFGBACKUP(8)