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Digital T:Z10 tape drive / Tru64 UNIX 5.1

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Jonathan Southwick
Occasional Contributor

Digital T:Z10 tape drive / Tru64 UNIX 5.1

I hope someone can help me here. We have a Digital TLZ10 tape drive installed on a system running Tru64 UNIX 5.1. The drive is configured via jumpers for compression but the data is not getting compressed when dumping to a DDS3 tape.

There is 15GB of data and it is not all getting dumped and sincxe a DDS3 tape will stor 12GB native/24 GB compressed, I know the data is not getting compressed.

Am I missing something? What can I do to get the drive to do compression when performing dumps.
3 REPLIES
Rob Leadbeater
Honored Contributor
Solution

Re: Digital T:Z10 tape drive / Tru64 UNIX 5.1

Hi,

What tape device are you using to do your backup ?

To get compression, you need to be using something like /dev/tape/tape0_d1

Look at the man page for mtio for more details...

Its also worth noting that not all data can be compressed, even with hardware compression... For example, if you've got 15GB of zip files to back up, it's unlikely to fit on a 12/24GB tape...

Cheers,

Rob

Jonathan Southwick
Occasional Contributor

Re: Digital T:Z10 tape drive / Tru64 UNIX 5.1

Rob,

We are using a Digital TLZ10 tape drive and are backing up mostly databases. I am doing a test right now with the device /dev/tape/tape0_d1.

A line out of our backup script that gets run from a cron is:

/usr/sbin/dump 0fsu /dev/ntape/tape1_d1 64 / >&/etc/dump_log

There are a few lines backing up different directories.

Jonathan

>Hi,
>
>What tape device are you using to do your
>backup ?
>
>To get compression, you need to be using
>something like /dev/tape/tape0_d1
>
>Look at the man page for mtio for more
>details...
>
>Its also worth noting that not all data can
>be compressed, even with hardware
>compression... For example, if you've got
>15GB of zip files to back up, it's unlikely
>to fit on a 12/24GB tape...
>
>Cheers,
>
Jonathan Southwick
Occasional Contributor

Re: Digital T:Z10 tape drive / Tru64 UNIX 5.1

Thanks Rob. It looks like it worked!


Jonathan