topic Re: backup in Operating System - OpenVMS

backup

Dipali — Tue, 04 Apr 2006 08:47:13 GMT

Hi

if i am using DDS4/DDS10 tapes with TLZ07/TLZ10 drive then can i use /DENS=DDS2/MEDIA=COMP in backup command and what is data integrity? or i have to specify as /dens=DDS4

Dipali.

Re: backup

Duncan Morris — Tue, 04 Apr 2006 08:58:00 GMT

Hi Dipali,

the TLZ07 supports a maximum density of DDS2, whilst the TLZ10 supports DDS3.

The /DENSITY qualifier is used to indicate the density which the tape drive should apply when writing. It does not apply to the cartridge.

Regrettably, I do not have the luxury of DDS4 tapes to check out whether the TLZ07/TLZ10 drives will even accept a DDS4 cartride. I know that some of the old TLZ drives would not even physically accept a DDS3 cartridge.

Re: backup

Antoniov. — Tue, 04 Apr 2006 08:59:56 GMT

Hi Dipali,
TLZ10 recognize tape cartridge. You can just use /MEDIA=COMP to compress data.
You have to use /DENS qualifier if device is not able to recognize tape.

Antonio Vigliotti
http://it.openvms.org

Re: backup

Karl Rohwedder — Wed, 05 Apr 2006 00:38:01 GMT

Dipali,

I would suggest to use the correct type of medium supported by your DAT device and to use the correct /DENSITY parameter.
If you use DDS3/DDS4 media in TLZ06 or older DAT devices, they or the media may get damaged, modern tapes are longer/thinner.

Btw. DDS3 is much cheaper than DDS4 e.g.

regards Kalle

Re: backup

Dipali — Wed, 05 Apr 2006 06:09:18 GMT

thanks for help.