[Info-vax] set fil/enter on a dump file

[George Cornelius]

Phillip Helbig---undress to reply wrote:
>>Be aware that having page, swap, and perhaps dump files on
>>a boot disk interferes with merges, but I have forgotten
>>some of the details.  Essentially you get full merges
>>on the system disk when you might not otherwise expect
>>them.  You can ignore this, but it does impact
>>performance when it occurs.  
> 
> 
> I haven't heard of this.

Well, I don't have experience beyond 7.3-2, but in my
environments when a node left the cluster I generally
found it was unable to completely dismount the system
disk when it had one or more of those files present,
the result being a system disk a shadow merge.

>>If you have minimerge
>>functionality (same as HBMM?) it is possible that that
>>improves things.
>
> HBMM requires that the dump file is not on the system disk.  However, it
> cannot be on a non-shadowed disk.  Since I don't have any
> controller-based RAID, I haven't set this up.  I suppose I could use 
> just a single non-shadowed disk and take my chances that the disk goes 
> bad just when a dump is needed. 

I don't believe it is controller based at all.  Controller based
minimerge operations have been around for quite some time, but they
may have only been for the older - CI and DSSI based - controllers,
and did not help much, if at all, for multidatacenter clusters.

George