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?
You're making the not-necessarily-valid assumption that Bacula isn't
already writing as much as it can.
There's two issues at work here. First, the storage industry used the
gigabyte of 10^9 bytes, rather than the 2^30 bytes we all think of as a
gigabyte. (You can bet that if the SI standard worked out to BIGGER
than what the industry was using, they'd be using the industry gigabyte
and patting themselves on the back for "staying with established
standards". The truth is, if they can get away with using a smaller
unit, it makes the devices seem bigger.) So, your 20GB is actually only
18.6GB.
Then there's the problem that that 40GB is assuming your average data
will compress 2:1. This is grossly unrealistic. 1.5:1 is more
reasonable, and 1.5 times 18.6 gives you 25.9GB ..... so you're getting
about what would actually be expected in the real world.
--
Phil Stracchino [EMAIL PROTECTED]
Renaissance Man, Unix generalist, Perl hacker
Mobile: 603-216-7037 Landline: 603-886-3518
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