03-26-2010 04:14 AM
03-26-2010 04:43 AM
03-26-2010 04:55 AM
Hi Colin
Thanks for the reply, that works except when the last friday falls before the last day of the month, i want to run the monthly back on the actual last working day of the month.
Is their any way around this?
Thanks
Phil
03-26-2010 06:00 AM
03-26-2010 02:03 PM
Phil,
I'm using a GFS scheme myself, and we have the mon-fri schedule as you do. What we've done is use Monday through Thursday as the daily sets (son), every Friday as the weekly sets (father), but use the first Friday of every month for the monthly (grandfather) backup.
This works well because you will always have 4 weeks every month, but running stuff on the last day can be tricky because it switches around a lot. Technically, your monthly backup can really fall on any single day you want it to, provided it's that day consistently - if you did it on the 1st or 4th friday, you will still have backups as old as how many media you have in the grandfather set.
I have 4 dailies, 4 weeklies, and 2 monthlies (one for even months, one for odd) (and enough data where every backup eats up half an LTO4 cart), so my grandfathers' max age is about 4 months. If I had 6 carts in the grandfather set I'd have a max of about a year of images. Essentially, you can have as many carts in each set as you want for more images, but being that the goal is having regular new backups but always keeping some old ones in case you have to go back that far, you can scale to what makes sense.
I might add that the 4th cart of the weekly set is the elusive 5th friday of the month (which only happens now and then).