[Info-vax] Shadowing & Reboot

[Paul Sture]

On Thu, 17 May 2012 17:22:07 +0200, Jan-Erik Soderholm wrote:

> Christoph Gartmann wrote 2012-05-17 16:08:
>> Hello,
>>
>> yet some more questions concerning shadowing of a non-system disk:
>>
>> I created a shadow set with two disks, each disk connected to a
>> different node. So far so good. Then I rebooted node 1. When node 1 was
>> up again, I had to manually add its disk back into the shadow set. So,
>> should I put this mount command into SYSTARTUP_VMS.COM? Next, the
>> remounted disk went into a full copy state, although there were no
>> changes made to the surviving disk on node 2.
> 
> How would the shadowing know that?
> It must scan (copy) the whole volume to be sure they are similar.
> 
> 
>   Is this normal?

Shadowing uses generation numbers to determine whether member copies are 
in sync.  When a single member is dismounted from the shadowset, the 
remaining members have their generation number incremented.

See the Volume Shadowing documentation for full details:

http://h71000.www7.hp.com/doc/84final/ba554_90020/index.html

or PDF:

http://h71000.www7.hp.com/doc/84FINAL/ba554_90020/ba554_90020.pdf


-- 
Paul Sture