ADSM-L

Re: Data on 3570 tape

2000-05-15 11:48:19
Subject: Re: Data on 3570 tape
From: Mark Adams <mark_adams AT CSGSYSTEMS DOT COM>
Date: Mon, 15 May 2000 10:48:19 -0500
Login as root
smitty
   devices
        tape drive
                Change/Show Characteristics of a Tape Drive
                        Choose appropriate drive(s)
                                About 3/4 of the way down it refers to
                                Hardware compression
I also think that you have to change a setting on the library
also. But I could be wrong about that.

Mark A. Adams
Systems Programmer
CSG SYSTEMS, INC.
(402) 963-8237


> -----Original Message-----
> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU]On Behalf Of
> Loon, E.J. van - SPLXM
> Sent: Friday, May 12, 2000 10:03 AM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: Re: Data on 3570 tape
>
>
> Hi Mark!
> You say: Also make sure the data compression is turned on for the
> device at
> the system level.
> How (and where) do I check this?
> Kindest regards,
> Eric van Loon
>
>
> -----Original Message-----
> From: Mark Adams [mailto:mark_adams AT CSGSYSTEMS DOT COM]
> Sent: Friday, 12 May, 2000 15:56
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: Re: Data on 3570 tape
>
>
> Data compression varies on a 3570. It will depend on the type of data you
> are
> backing up. I have data compression turned off for the client and I am
> getting
> around 10 Gb per tape. The reports you see from *SM are based on a 5 Gb
> figure.
> When you get to 5 Gb it will stay in a filling status until the tape is
> full,
> at which time it will change to a full status and start using
> another tape.
> Once a tape is full you will see more accurate figure as far as your
> compression
> is concerned.
>
> Keep in mind binary data will not compress as much. Also make
> sure the data
> compression is turned on for the device at the system level.
>
> Mark A. Adams
> Systems Programmer
> CSG SYSTEMS, INC.
> (402) 963-8237
>
>
> > -----Original Message-----
> > From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU]On Behalf 
> > Of
> > Loon, E.J. van - SPLXM
> > Sent: Thursday, May 11, 2000 9:32 AM
> > To: ADSM-L AT VM.MARIST DOT EDU
> > Subject: Data on 3570 tape
> >
> >
> > Hi *SM-ers!
> > I'm currently testing our new TSM server.
> > During one of my test I discovered that the throughput from disk
> > to tape and
> > from tape to tape was a little bit disappointing: about 6
> Mbytes/sec. The
> > data rate for a 3570 unit should be 7 Mbytes/sec. sustained and 15
> > Mbytes/sec with 3:1 compression.
> > I checked the volume afterwards and I saw something else.
> > It's a 5 Gb. volume with 1.79 Gb of data on it. TSM reports
> that the tape
> > has a utilization of 34.2%. So 1.79 Gb. divided by 34.2 times
> 100 makes a
> > tape capacity of about 5.2 Gb.
> > I know for sure that the data that has been send to TSM is uncompressed
> > data, so that is why I'm thinking that the tape unit is NOT
> > compressing the
> > data!
> > Is unit compression a feature you have to turn on manually? If
> > so, where do
> > you control this?
> > Thanks in advance for your reply!
> > Kindest regards,
> > Eric van Loon
> >
> >
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>
> **********************************************************************
> This e-mail and any attachment may contain confidential and
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> for the incorrect or incomplete transmission of this e-mail or
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