Cannot read 4mm between machines

[Terry Polzin]

Greetings:

I created a tar archive on a 7012 320 AIX 3.2.1, no problems creating
the archive.
But when I try to restore the archive on a 7248-100 AIX 4.3.3 (base no
ML loaded) the drive accesses the tape but I can't seem to read any
data on it. The media is 4mm dat I'm using the exact same drive to
restore as I created the archive. Downing the one machine and moving
the drive before booting the other.

Any ideas would be appreciated.

THANKS,

Terry

[Kent Squires]

make sure the tape block size is set the same ( or on destination
server, just set it to 0)

On 16 Sep 2003 05:02:10 -0700, [email]t_polzin@yahoo.com[/email] (Terry Polzin)
wrote:

>Greetings:
>
>I created a tar archive on a 7012 320 AIX 3.2.1, no problems creating
>the archive.
>But when I try to restore the archive on a 7248-100 AIX 4.3.3 (base no
>ML loaded) the drive accesses the tape but I can't seem to read any
>data on it. The media is 4mm dat I'm using the exact same drive to
>restore as I created the archive. Downing the one machine and moving
>the drive before booting the other.
>
>Any ideas would be appreciated.
>
>THANKS,
>
>Terry

[Steve Nottingham]

Kent Squires <ksquires@geeks.org> wrote in message news:<spvdmvc736etn05npplr162rq5b0vjkjl7@4ax.com>. ..

> make sure the tape block size is set the same ( or on destination
> server, just set it to 0)
>
> On 16 Sep 2003 05:02:10 -0700, [email]t_polzin@yahoo.com[/email] (Terry Polzin)
> wrote:
>

> >Greetings:
> >
> >I created a tar archive on a 7012 320 AIX 3.2.1, no problems creating
> >the archive.
> >But when I try to restore the archive on a 7248-100 AIX 4.3.3 (base no
> >ML loaded) the drive accesses the tape but I can't seem to read any
> >data on it. The media is 4mm dat I'm using the exact same drive to
> >restore as I created the archive. Downing the one machine and moving
> >the drive before booting the other.
> >
> >Any ideas would be appreciated.
> >
> >THANKS,
> >
> >Terry

Use the command "lsattr -El rmt0 -a block_size" to find the block
size. To set it, use "chdev -l rmt0 -a block_size=<block_size>" Where
block_size is the value from the previous command.

Stevc

[Terry Polzin]

[email]steve@wakefieldrfc.freeserve.co.uk[/email] (Steve Nottingham) wrote in message news:<42862645.0309161410.c8b3b5e@posting.google.c om>...

> Kent Squires <ksquires@geeks.org> wrote in message news:<spvdmvc736etn05npplr162rq5b0vjkjl7@4ax.com>. ..

> > make sure the tape block size is set the same ( or on destination
> > server, just set it to 0)
> >
> > On 16 Sep 2003 05:02:10 -0700, [email]t_polzin@yahoo.com[/email] (Terry Polzin)
> > wrote:
> >

> > >Greetings:
> > >
> > >I created a tar archive on a 7012 320 AIX 3.2.1, no problems creating
> > >the archive.
> > >But when I try to restore the archive on a 7248-100 AIX 4.3.3 (base no
> > >ML loaded) the drive accesses the tape but I can't seem to read any
> > >data on it. The media is 4mm dat I'm using the exact same drive to
> > >restore as I created the archive. Downing the one machine and moving
> > >the drive before booting the other.
> > >
> > >Any ideas would be appreciated.
> > >
> > >THANKS,
> > >
> > >Terry

>
> Use the command "lsattr -El rmt0 -a block_size" to find the block
> size. To set it, use "chdev -l rmt0 -a block_size=<block_size>" Where
> block_size is the value from the previous command.
>
> Stevc

I'll double check, but I believe that the block size is zero on both machines.

[Josef Walzer]

Terry Polzin schrieb:

>
> [email]steve@wakefieldrfc.freeserve.co.uk[/email] (Steve Nottingham) wrote in message news:<42862645.0309161410.c8b3b5e@posting.google.c om>...

> > Kent Squires <ksquires@geeks.org> wrote in message news:<spvdmvc736etn05npplr162rq5b0vjkjl7@4ax.com>. ..

> > > make sure the tape block size is set the same ( or on destination
> > > server, just set it to 0)
> > >
> > > On 16 Sep 2003 05:02:10 -0700, [email]t_polzin@yahoo.com[/email] (Terry Polzin)
> > > wrote:
> > >
> > > >Greetings:
> > > >
> > > >I created a tar archive on a 7012 320 AIX 3.2.1, no problems creating
> > > >the archive.
> > > >But when I try to restore the archive on a 7248-100 AIX 4.3.3 (base no
> > > >ML loaded) the drive accesses the tape but I can't seem to read any
> > > >data on it. The media is 4mm dat I'm using the exact same drive to
> > > >restore as I created the archive. Downing the one machine and moving
> > > >the drive before booting the other.
> > > >
> > > >Any ideas would be appreciated.
> > > >
> > > >THANKS,
> > > >
> > > >Terry

> >
> > Use the command "lsattr -El rmt0 -a block_size" to find the block
> > size. To set it, use "chdev -l rmt0 -a block_size=<block_size>" Where
> > block_size is the value from the previous command.
> >
> > Stevc

>
> I'll double check, but I believe that the block size is zero on both machines.

tctl -n -b 10240 -p 10240 read | tar

HTH,
Joe
--
Josef Walzer
Messerli Informatik GmbH, Hamoderstr. 4, A-4020 Linz
http:://www.messerli.at

[Terry Polzin]

Josef Walzer <joe.spam@messerli.at> wrote in message news:<3F688BA4.C1371435@messerli.at>...

> Terry Polzin schrieb:

> >
> > [email]steve@wakefieldrfc.freeserve.co.uk[/email] (Steve Nottingham) wrote in message news:<42862645.0309161410.c8b3b5e@posting.google.c om>...

> > > Kent Squires <ksquires@geeks.org> wrote in message news:<spvdmvc736etn05npplr162rq5b0vjkjl7@4ax.com>. ..
> > > > make sure the tape block size is set the same ( or on destination
> > > > server, just set it to 0)
> > > >
> > > > On 16 Sep 2003 05:02:10 -0700, [email]t_polzin@yahoo.com[/email] (Terry Polzin)
> > > > wrote:
> > > >
> > > > >Greetings:
> > > > >
> > > > >I created a tar archive on a 7012 320 AIX 3.2.1, no problems creating
> > > > >the archive.
> > > > >But when I try to restore the archive on a 7248-100 AIX 4.3.3 (base no
> > > > >ML loaded) the drive accesses the tape but I can't seem to read any
> > > > >data on it. The media is 4mm dat I'm using the exact same drive to
> > > > >restore as I created the archive. Downing the one machine and moving
> > > > >the drive before booting the other.
> > > > >
> > > > >Any ideas would be appreciated.
> > > > >
> > > > >THANKS,
> > > > >
> > > > >Terry
> > >
> > > Use the command "lsattr -El rmt0 -a block_size" to find the block
> > > size. To set it, use "chdev -l rmt0 -a block_size=<block_size>" Where
> > > block_size is the value from the previous command.
> > >
> > > Stevc

> >
> > I'll double check, but I believe that the block size is zero on both machines.

>
> tctl -n -b 10240 -p 10240 read | tar
>
> HTH,
> Joe

tctl -f /dev/rmt0 -n -b 10240 -p 10240 read | tar xvf -
tctl: 0511-578 Cannot read 10240 bytes: The media surface is damaged.
tar: Unexpected end-of-file while reading from the storage media.

So know what?? Make another tape and try again?

[Josef Walzer]

Terry Polzin schrieb:

> > > > > >I created a tar archive on a 7012 320 AIX 3.2.1, no problems creating
> > > > > >the archive.
> > > > > >But when I try to restore the archive on a 7248-100 AIX 4.3.3 (base no
> > > > > >ML loaded) the drive accesses the tape but I can't seem to read any
> > > > > >data on it. The media is 4mm dat I'm using the exact same drive to
> > > > > >restore as I created the archive. Downing the one machine and moving
> > > > > >the drive before booting the other.

> tctl -f /dev/rmt0 -n -b 10240 -p 10240 read | tar xvf -
> tctl: 0511-578 Cannot read 10240 bytes: The media surface is damaged.
> tar: Unexpected end-of-file while reading from the storage media.
>
> So know what?? Make another tape and try again?

Is this the same drive on both machines or the same type of drive?
if two drives, is the physical blocksize changeable by jumper?
is the tape readable with the original machine?
is a tape readable the other way?

you may force the blocksize at write with tar | tctl -f /dev/rmt0 -b 10240 -p 10240 write.
does this affect the result?

greetings,
joe

--
Josef Walzer
Messerli Informatik GmbH, Hamoderstr. 4, A-4020 Linz
http:://www.messerli.at

[Hans-Joachim Ehlers]

"Terry Polzin" <t_polzin@yahoo.com> schrieb im Newsbeitrag
news:81672230.0309160402.158c4b10@posting.google.c om...

> Greetings:
>
> I created a tar archive on a 7012 320 AIX 3.2.1, no problems creating
> the archive.
> But when I try to restore the archive on a 7248-100 AIX 4.3.3 (base no
> ML loaded) the drive accesses the tape but I can't seem to read any
> data on it. The media is 4mm dat I'm using the exact same drive to
> restore as I created the archive. Downing the one machine and moving
> the drive before booting the other.
>
> Any ideas would be appreciated.

For trouble-shooting
Try to restore ( read ) the tape on your AIX 3.2.1 machine

If it fails ( what i believe ) it might be a good idea to use a cleaning
tape or/and a new tape

HTH
Hajo

CATE AIX/RS6000