On Thursday 10 October 2002 04:28, Paul Bijnens wrote:
>Craig Hancock [EMAIL PROTECTED] wrote:
>...
>
>> define tapetype AIT-3 {
>> comment "Sony AIT-3 Tape 100/200GB"
>> length 79720 mbytes
>> filemark 5743 kbytes
>> speed 1634 kps
>
>Not the problem you have, but...
>
>I can see with my eyes closed that you have hardware compression
> enabled on this device. You're wasting 20 GByte on each tape if
> you enable both hardware compression AND software compression
> (and if you disable software compression, and use only hardware
> compression, you can put more an 100 GByte on that tape).
>
>Attached is an updated version of tapetype that detects drives
> with hardcompression enabled (and warns you). It did not make in
> the latest amanda version 2.4.3.
Thanks Paul. We've needed that.
While the above is true, if he has the horsepower to do software
compression, the tape useage will be even less. With last nights
run here as an example, using software compression ONLY on those
partitions/directories that are in fact compressable, skipping any
attempted compression of directories full of archived and already
compressed stuff, something in the area of 5059 megs actually used
about 1614 megs on a 4gig tape, the average compression being
reported as 31.7%. The hardware compressor in the drive can't
touch that by quite a few hundred megs.
However, he shouldn't attempt to do all this compression on the
server alone since it is time consuming. By doing it on say 4
clients at a time in parallel, it should be done faster overall.
And of course would use less network bandwidth doing the data moves
since they're going to be smaller.
--
Cheers, Gene
AMD K6-III@500mhz 320M
Athlon1600XP@1400mhz 512M
99.17% setiathome rank, not too shabby for a WV hillbilly
