[Info-vax] modified blocks on static disks

[Phillip Helbig---undress to reply]

In article <j7hfnl$n7k$1 at usenet01.boi.hp.com>, "Robert A. Brooks"
<rab at aitchpee.com> writes: 

> On 10/16/2011 8:52 AM, Phillip Helbig---undress to reply wrote:
> > SHOW SHADOW shows things like
> >
> >      Modified blocks since bitmap creation: 254
> >
> > even on a disk which is static (i.e. no application writing to it; even,
> > in some cases, no application reading from it).  What could cause this?
> > Could it be HBMM itself?
> 
> The granularity of the bitmap is 127 blocks, so what you're seeing is 
> two bits set in the bitmap.  Yes, there could literally be 254 blocks 
> written, but it's likely to be two separate writes that are more than 
> 127 block apart.
> 
> Likely to be just standard Files-11 stuff as part of mounting a volume, 
> but I'm not really sure.

The puzzling thing is that I issued the SET SHADOW commands when the 
cluster was up and running, all disks mounted etc and no changes since 
then.