Hello SUN managers:
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My original posting:
Hello SUN managers,
We keep the full image of our file system at the beginning of each
month for as long as we can remember. I wonder how many full dumps
that you keep and what kind of recycling strategy you use in your
site.
Have you heard anything about the exponential decay algorithm?
We'll post a summary. Thanks very much.
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My summary:
Other sites keep their full dump tapes ranging from 6 months to
a years, depending on the type of data. Some important legal data
will never recycled, system files will be kept longer than user files.
I would like to thank every one who responded to my question.
The following are schemes/comments that may be of interest to others:
1. Seven sets of tapes: week1, week2, week3, month1, month2, quarter1,
and quarter2 ... Depending on your needs you can take a new set
of tapes each time you arrive to "q2", saving the old one forever.
Thanks to Alex Pokras <pkrs@isg.co.il>
2. We keep ~12 weeks of daily backups before we start recycling tapes.
At that point we archive one tape per week (usually monday) and place
alternate weeks off site.
Thanks to worsham@aer.com (Robert D. Worsham)
3. we make a back up in the early morning on the 1st day of every month,
and we keep those tapes for a long long time... (we have never
recycled these tapes)
Thanks to Derald.Mcmillan@soltech.com (Derald McMillan)
4. Monthly full dump of system files - kept for 1 year;
Monthly full dump of user files - kept for 6 months (this was typically
the first weekly dump of the month)
Weekly full dump of user files - kept for 6 weeks
Thanks to "Susan M. Menig" <ddq251f@shoes.Bell-Atl.Com
5. Data tapes 8-mm should be used no more than 35 times
3M and Basf recommendations.
Thanks to jcsadmin!jc@eng.dowjones.com (John Ciesla)
7. Legal requirements notwithstanding (we have some Federal customers who
want everything retained forever) we keep monthly image dumps for three
years, then recycle
Thanks to Ross.Stocks.INSDRS01@nt.com
7. I dump every machine completely twice a week on a set of 8 Exabyte
tapes I use. Then, once a month, I do a monthly dump once a month
on a set of 6 tapes. Every six months, I make a permanent archive and
never use it again.
Thanks to Nico Garcia (raoul@mit.edu)
Zina
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