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Re: Backup startegy help
2004-12-23 08:53:45
OK, you can all stop laughing at me calling 80GB Huge. Sorry.
Anyway, we do have a 80/160GB DLT tape. However I do not like it for 2
reasons:
1. Our previous 40/80 DLT tape let us down and the tape got eaten by the
tape drive at the most critical time.
2. Irrespective of the tape reliability, someone has to change the tape
each day, since a tape changer is clearly way out of our budget. Knowing
the people here, and me in particular, this won't happen.
This is why a daily disk drive backup is attractive to us. We are
content with having just 14 days of history. each week we will also do a
tape backup for off site storage.
As for the strategy -- If I have some (OK, not HUGE) body of data that
is unchanging by definition, I would like Amanda to do one level 0, and
then continue with lower levels until this becomes unpractical (i.e.
sizeof(level 1) ~ sizeof(level 0) ). I would only need to keep the level
0 and 14 level 1's to have a 14 days day by day history. This is almost
what Amanda does, only there is a dumpcycle limit in days. Can this be
done ?
Shai
Gerhard den Hollander wrote:
Shai wrote:
I'm trying to set up an backup system in our company. We have two
major file systems to backup - one is the homedirs of everyone,
including mail in Maildir format, and the other is data.
Our idea was to have two computers -- one would hold the data and
homes, and the other would back it up daily to a disk.
Additionally, once a week or so we would to a tape backup to take
off site.
May I suggest that in stead of buying a second computer, you invest in an
LTO drive (can back up 100G uncompressed) and now that LTO3 has hit the
market LTO1 drives are relatively cheap.
Then buy 10 (or preferably 20) additional tapes .
Then setup amanda to make daily backups.
Given that you now have a drive that holds 100G I would strongly recommend
to use amanda's default way of doing things for both data and home.
The data is quite huge and it is often updated but only in small
amounts, i.e. we have about 80GB of data, and we add less than 300MB
each week. Clearly doing a full backup every week is very wasteful.
;) It's refreshing to see peopel refer to 80G of data as HUGE ;)
Kind regards,
--
Gerhard den Hollander Phone :+31-10.280.1515
Global ICT manager Direct:+31-10.280.1539
Fugro-Jason Fax :+31-10.280.1511
gdenhollander AT Fugro-Jason DOT com POBox 1573
visit us at http://www.Fugro-Jason.com 3000 BN Rotterdam
JASON.......#1 in Reservoir Characterization The Netherlands
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