Hi,
On 26.09.2005 21:02, Trevor Morrison wrote:
Hi,
I have an Exabyte-8900 20/40 GB drive and it does a great job backing up
my boxes. My question is: After about 25 GB, Bacula says the tape is
full and wants another tape. According to the LCD display on the drive
itself, compression is turned on. So, how can I tell Bacula to write up
to 40 GB worth of data to the tape before changing?
Use text files only.
Unfortunately, manufacturers usually say data is compressed by a factor
that is far from normal at most sites. Compression depends on the data
you have - for example, text files compress quite good, while jpeg
images or digital video can't be compressed very effective.
The numbers the manufacturers use - 1:2 to 1:2.6 - is just marketing. I
know of almost nobody who achieves that sort of compression over all the
jobs.
Personally, I see between 3.5 GB and 12 GB on a 4/8 GB DDS tape - the
lower number is what becomes of a full backup with program files and
user data, the high number is achieved during daily incrementals which
store almost only log files.
By the way: 1:1.25 is ok for a "normal" backup, in my opinion.
Arno
TIA,
--
IT-Service Lehmann [EMAIL PROTECTED]
Arno Lehmann http://www.its-lehmann.de
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