[Info-vax] NEW HBVS question

[Phillip Helbig undress to reply]

In article <qn3go7$um0$1 at pcls7.std.com>, moroney at world.std.spaamtrap.com
(Michael Moroney) writes: 

> Did you shut down the cluster properly? Meaning that shadowset was
> correctly dismounted by the shutdown procedure?

Yes.

> Do you have minicopy/minimerge enabled?

Yes.  Of course, if there was a minicopy or minimerge it might have been 
too quick to notice.  However, if all members were powered down, then 
the bitmaps disappear, right?

> Or did you say the two shadowsets were mounted on the first two nodes,
> with one member per shadowset, and the third node added a disk to each
> of two shadowsets but there was no copy?  

Right.  Nodes A and C came up.  All the other shadow sets behaved as
expected.  In particular, there was a full copy on a third shadow set
with members on A, B, and C.  Two shadow sets have members on A and B. 
B came up after A and C were up and had mounted all shadow sets with all
disks which were available at the time.  So, for a while, these two
shadow sets had only the members connected to A (all local SCSI
connections, no dual-ported disks).  When B came back up and served the
disks which are the other members of the two shadow sets, there was no
full copy. 

> Again do you have minicopy? 

Yes.

The difference to the three-member shadow set is that there were no 
WRITEs to the two shadow sets in question, so actually a copy was not 
required.  My question is how HBVS could have known that there were no 
WRITEs.

Yes, I could have missed a minicopy.  I thought that if I shut down the 
entire cluster (properly or not), then the bitmaps used by minicopy 
would disappear, since they are only in RAM.  Or are they written to 
disk (at least in case of a proper shutdown)?