Hi!Toomas,
I've indicated 40Gb because my PowerVault is configured as yours, to compress data by
hardware ( I think in a 2:1 ratio by default). I don't use any software to compress
data, and all the data I should backup are locally to server. Do you think in this
scenario will I have problems with amanda if I indicate 40Gb -tapes in my descriptors
(or seemed, 35Gb if 40Gb is too much optimistic) ?
I will make use of your filemark and speed values, much thanks ;-)
Best regards,
----- Original Message -----
From: "Toomas Aas" <[EMAIL PROTECTED]>
To: "Ra.l Wild-Spain" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Tuesday, February 25, 2003 5:56 PM
Subject: Re: Q: simple but how ?
> Hi!
>
> > define tapetype DDS-4-40{
> > comment "DDS-4 PowerVault with compression"
> > DDS-4-20
> > length 40000 mbytes
> > }
>
> This length number is probably too optimistic. This assumes that your
> data compresses with a 2:1 ratio, which is rarely seen in real life.
> FWIW, here's my tapetype with DDS4 drive using hardware compression:
>
> define tapetype DDS4 {
> comment "DDS4 using hardware compression"
> length 25000 Mbytes
> filemark 0 Kbytes
> speed 2816 Kbytes
> }
>
> The length number is really just a guess (I think I underestimate the
> compression a little, but since I only have 10 GB of data this is not
> an issue for me right now). The speed number is taken from "avg tp
> write rate" as reported by Amanda's nightly run.
> --
> Toomas Aas | [EMAIL PROTECTED] | http://www.raad.tartu.ee/~toomas/
> * One way to be happy ever after is not to be after too much.
>
