I have different values for the filemarks, measured with another program and
not amtapetype.
Do you know if the filemarks are application-dependant, tape-dependant,
tape-and-taper-dependant ???
The IBM fms software tells that filemarks are tape-and-taper-dependant. Do you
know more? Do you have any opinions concerning that?
Just to be sure we are talking about the same thing. When you write data on a
tape, you write sequences of "data / mark / data / mark" wehre the marks are
here to make a separation between the different flows of data, the "fsf 1"
parameter of mt, the "EOD" (End Of Data) mark.
A tape contains a sequence like that:
BOT.(data.EOD)*.EOT
| BOT = Begin Of Tape
| data = well...
| EOD = End Of Data
| EOT = End Of Tape
An opinion?
On Fri, 17 Oct 2003 10:54:11 +0200
Paul Bijnens <paul.bijnens AT xplanation DOT com> wrote:
> Rohit wrote:
>
> > Btw, how do I get these details for my tape? What I use is
> > HP-DAT DDS3 (C5708A) 12/24 GB tape.
>
> Take a blank tape, and run:
>
> amtapetype -e 12g -f /dev/YourTapeDevice
>
> This takes about 4-5 hours to run.
>
> Or, your could use a good conservative approximation like:
>
> define tapetype DDS3 {
> comment "DDS3 tape drives"
> length 11500 mbytes
> filemark 111 kbytes
> speed 2500 kbytes
> }
>
> Running "amtapetype" yourself at least once is good to check
> the rest of the values and if they make sense. E.g. a very low
> speed (compared to what the manufacturer specifies) is a possible
> hint that your server is not fast enough. It also detects
> if you have hardware compression enabled.
>
> --
> Paul Bijnens, Xplanation Tel +32 16 397.511
> Technologielaan 21 bus 2, B-3001 Leuven, BELGIUM Fax +32 16 397.512
> http://www.xplanation.com/ email: Paul.Bijnens AT xplanation DOT com
> ***********************************************************************
> * I think I've got the hang of it now: exit, ^D, ^C, ^\, ^Z, ^Q, F6, *
> * quit, ZZ, :q, :q!, M-Z, ^X^C, logoff, logout, close, bye, /bye, *
> * stop, end, F3, ~., ^]c, +++ ATH, disconnect, halt, abort, hangup, *
> * PF4, F20, ^X^X, :D::D, KJOB, F14-f-e, F8-e, kill -1 $$, shutdown, *
> * kill -9 1, Alt-F4, Ctrl-Alt-Del, AltGr-NumLock, Stop-A, ... *
> * ... "Are you sure?" ... YES ... Phew ... I'm out *
> ***********************************************************************
>
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