[Info-vax] From ODS-2 to ODS-5

[Dave Froble]

On 8/20/2020 5:21 PM, Arne Vajhøj wrote:
> On 8/20/2020 5:17 PM, abrsvc wrote:
>> On Thursday, 20 August 2020 17:08:03 UTC-4, Jan-Erik Söderholm  wrote:
>>> Den 2020-08-20 kl. 22:55, skrev abrsvc:
>>>> On Thursday, 20 August 2020 16:52:27 UTC-4, Arne Vajhøj  wrote:
>>>>> $ SET VOL/STRUCT=5 DKxn
>>>>>
>>>>> supposedly should do it, but would it be "better" to backup data,
>>>>> init disk and restore data?
>>>>
>>>> If it were me, I would backup the data, create a new disk of ODS5
>>>> and "restore" to that new disk using NOINITIALIZE (if an image backup).
>>>
>>> Right, but the question is *why* is that better?
>>> What is the issue with a direct convert of a disk volyme?
>>
>> In theory nothing.  Practically (most times) nothing.  But...  I'd
>> rather be on the safe side and have a backup.
>
> I was not so concerned about safety.
>
> I was more concerned about the various sizes. Will they be the same
> or will SET VOL inherit old sizes from 2 while INIT will use new
> sizes for 5?
>
> Arne
>

ODS5 is a superset of ODS2.

It is my understanding that all that happens is the drive info is 
updated.  All ODS2 stuff remains the same.

If it was me, I'd also opt for a backup first, even if I didn't restore 
from the backup.  One could do a verify/compare pass to insure nothing 
was lost.

I've not yet used ODS5, the advice is worth what you paid for it.

-- 
David Froble                       Tel: 724-529-0450
Dave Froble Enterprises, Inc.      E-Mail: davef at tsoft-inc.com
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