Re: hardware vs software compression (was Re: amflush/amcheck not in sync?)
2003-04-24 11:02:20
On Thu, Apr 24, 2003 at 09:26:12AM -0500, Russell Adams wrote:
> > Of course hardware compression has one big advantage: speed. If you
> > have to fit lots of data in a small backup window at night, and your
> > cpu's are not fast enough, or interfere with the nightly cpu-intensive
> > jobs, then hardware compression is the way to go.
>
>
> I have to take issue with this. My experience with hardware
> compression on DDS and DLT drives is that when enabled it makes things
> incredibly slow.
>
> My DLT IV (er, 7000?) drives can do 4.9 MB/s uncompressed, and only
> 800KB/s in compressed mode.
>
This is of course counter to advertising claims :))
Are you sure there was not some other factor involved. A possibility
that comes to mind is that the no-hw-compression came from data already
in a single file or local to the server while the with-hw-compression
test data had to be "found" and that procedure caused the slow down?
--
Jon H. LaBadie jon AT jgcomp DOT com
JG Computing
4455 Province Line Road (609) 252-0159
Princeton, NJ 08540-4322 (609) 683-7220 (fax)
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- Re: amflush/amcheck not in sync?, (continued)
Re: amflush/amcheck not in sync?, Paul Bijnens
- Re: amflush/amcheck not in sync?, Gene Heskett
- hardware vs software compression (was Re: amflush/amcheck not in sync?), Jeroen Heijungs
- Re: hardware vs software compression (was Re: amflush/amcheck not in sync?), Paul Bijnens
- Re: hardware vs software compression (was Re: amflush/amcheck not in sync?), Russell Adams
- Re: hardware vs software compression (was Re: amflush/amcheck not in sync?),
Jon LaBadie <=
- Re: hardware vs software compression (was Re: amflush/amcheck not in sync?), Mitch Collinsworth
- Re: hardware vs software compression (was Re: amflush/amcheck not in sync?), Jon LaBadie
- Re: hardware vs software compression (was Re: amflush/amcheck not in sync?), Mitch Collinsworth
- Re: hardware vs software compression (was Re: amflush/amcheck not in sync?), Jon LaBadie
- Re: hardware vs software compression (was Re: amflush/amcheck not in sync?), Mitch Collinsworth
Re: hardware vs software compression (was Re: amflush/amcheck not in sync?), Russell Adams
Re: hardware vs software compression (was Re: amflush/amcheck not in sync?), Mitch Collinsworth
Using rhosts authentication ?, DK Smith
Re: hardware vs software compression (was Re: amflush/amcheck not in sync?), Martin hepworth
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