Retro 8 Groom?

[Henry M. Seiden]

One the Groom has taken place, as you go down the road, from what I  
understand in the automatic mode there will be a week's worth, to  
delete each time, then a month, etc. Then there shouldn't be that many  
to groom out as when starting from scratch on the first grooming. Right?

So that extended grooming duration is only the first time, if in  
automatic mode? I could live with that.

Or does it go through each backup date each time culling out each old  
backup date, sort of progressively? I think that Time Machine uses a  
similar grooming process, just by observation. However it seems to  
work much quicker because it builds it as it goes, on the fly without  
manual intervention or changes allowed.

Henry
On Jul 31, 2009, at 15:11 , Steve Maser wrote:

>> From: "Henry M. Seiden" <info at techworkspro.com>
>> Subject: Re: Retro 8 Groom?
>> To: EMC Retro-Talk <retro-talk at list.dantz.com>
>> Message-ID: <2FB7D422-8B89-4BF3-99CD-ADDE9B346440 at techworkspro.com>
>> Content-Type: text/plain; charset="us-ascii"
>>
>> I notice that grooming takes a while (about 3 hours before the script
>> terminated without backing up anything). Perhaps that's only the  
>> first
>> time?
>>
>> Henry
>
>
>
> Grooming takes a *long, long time* -- if you have a lot of backups  
> in your media set -- and depending what you actually groom.
>
> As a real-world example:  I groomed out *2* past backups of my 730G  
> disk media set 2 days ago.
>
> it took approximately 20 hours to run the groom script (there were  
> probably about 520 backups in the actual media set).   I manually  
> deleted the last "Past Backup" and one of the first ones.
>
>
> So, which "Past Backups" you actually groom may have some effect on  
> the speed.
>
> I think (from my earlier testing) that if you just groomed one of  
> the later "Past Backups" in your media set -- then it goes faster  
> because it doesn't have to do as much catalog matching.
>
>
> But if you groom something from the *beginning* of your media set  
> (either by manually deleting a "Past Backup" or by having your media  
> set grooming options set to automatic/fixed number), there's a *lot*  
> of catalog matching/"past backup" matching that goes on before the  
> actual physical *disk* groom takes place.  I actually watched this  
> in the 20th hour.   The process kept showing a bunch of matching,  
> etc -- and then all of a sudden near the end there was a burst of  
> activity where it was actually deleting the files to be groomed and  
> updating the catalog file.
>
>
> Just be advised of this when planning your groom strategy.
>
> - Steve
> -- 
> Steve Maser (maser at umich.edu)    | Thinking is man's only basic  
> virtue,
> Sr. Systems Administrator        | from which all the others proceed.
> Office of Technology Transfer    |                          -- Ayn  
> Rand
>
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