And another: You should be aware that may have problems if you then
try to restore this compressed data onto a volume that has no
compression disabled.
Tom
> One more thing to add -
>
> Netware 4.1 can be set up so that it will give ADSM the file in compressed
> format. ADSM, then will store it as such. This is more efficient, in that it
> eliminates a commpression and decompression step, and is therefore the
> recommended way of handling a NetWare 4.x file system.
>
> BTW, keep commpression on ADSM turned off for this.
>
> If you don't do this, Netware will decompress the file, then give it to ADSM,
> who will then compress it again. Seems like a lot of extra work to me.
>
> Jerry Lawson
> jlawson AT itthartford DOT com
>
> Jerry Lawson
> jlawson AT itthartford DOT com
> ________________________Forward Header________________________
> Author: INTERNET.OWNERAD
> Subject: Re: Netware 4.1 and File Compression
> 11-27-96 01:05 PM
>
> On Wed, 27 Nov 1996 17:42:56 +1300, Dianne Sharp wrote:
>
> >We have 3 Netware 4.1 servers which support data compression.
> >In the ADSM Client option file, I have not specified COMPRESSION as an
> >option, therefore I understand it should default to NO.
> >The Compression option for the Nodes is Client determined.
> >
> >However, it appears that the data is sent to the ADSM Server (V1 on MVS)
> >in compressed format because the amount of data checks out with the
> >compressed amount on the Netware servers.
>
> Check to see if you have any scheduled operation which indicates
> -compress=yes. It seems that compression is a toggle. I had the same
> situation in which I had one directory I wanted it to be compresses,
> but after that directory was done then the client continued using
> compression.
>
> >THE PROBLEM :
> >It appears that when the ADSM backups are running, the Netware server
> >CPU utilisation goes right up because, according to our Netware "gurus",
> >it is uncompressing files for ADSM to read.
> >Does this mean that they are uncompressed by Netware, then compressed
> >again by ADSM?
>
> Compression and Decompresssion is done by the netware client. Or to
> be more general compression is done by the clients. This is actually
> a good thing since if you have many different computers running at
> the same time the ADSM server will have less work since it is getting
> less data to work with. This is actually distributing the compression
> to each client.
>
> I use compression on my netware servers and it does not increase
> utilization that much. Find out how much memory you have on those
> netware servers. If they don't have enough memory then that could be
> your problem. Moreover, did you ever use the "processor" option on
> the dsm.opt file? If you did and you placed a number greater than 1
> then reduce it. If memory is low then use "slowincremental" in your
> dsm.opt.
>
>
==============================
Tom Anstey
Oxford University Computing Services
13 Banbury Road
Oxford
OX2 6NN
Tel: +44 (0)1865 273200
Fax: +44 (0)1865 273275
|
