On Fri, Apr 22, 2005 at 11:35:59AM -0400, Jingchun Chen wrote:
> Hi There,
>
> I plan to change amanda backup schedule due to reduction of the size of the
> working group. Currently dumpcycle=6Days; runspercycle=3 (runs every other
> day), using 4 tapes (on disk). I just want to change dumpcycle to one month.
> Here is the list of changes I think I should do.
>
> 1. amanda.conf
> dumpcycle 30 days
> runspercycle 15
> tapecycle 16 # (15+1)
>
> ### Do I need to change this? The backup disk has 200G, that's why the length
> was set to 48G (200/4). If I change it to 12G (200/16), it's not enough to
> hold a full dump. Since this is vertual tape, I can probably set to 30G and
> hope there will be no more than 6 full dump per cycle.
> define tapetype HARD-DISK {
> comment "Backup to disk - not tape"
> length 48000 mbytes
> }
>
> 2. chg-multi (tapechanger)
> firstslot 1
> lastslot 16
>
> slot 1file:/xxx
> ...
> slot 16 file: /xxx
>
> 3. Add tape directories T5-T16 on backup disk.
>
> 4. cron
> xxx
>
> My questions are:
>
> 1. Do I miss anything I should change?
> 2. When will this change take effect?
> 3. Will amanda do this transition seamlessly?
>
Depending on where you are in using your tapecycle, it may not
start immediately with the new vtape in slot 5.
Unlikely there will be 6 full dumps of anything in a month
as you have only asked for 'at least 1' a month. But you
won't know until you've tried. I suspect leaving the tape
size large is not going to be a problem. Monitor the disk
usage for a while to be certain.
I'd be scared with only 1 tape more than the minimum.
Suppose something is 'off-line' the day it is due for
a full backup. On the next amdump run, the tape containing
your only full dump will be overwritten. Consider the
possibility that the DLE is still off-line or an error occurs.
You will have no full dump for that DLE. Now you have only
incrementals. I'd feel better with 32 tapes or 14 day dumpcycle.
--
Jon H. LaBadie jon AT jgcomp DOT com
JG Computing
4455 Province Line Road (609) 252-0159
Princeton, NJ 08540-4322 (609) 683-7220 (fax)
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