[Info-vax] Uptime for OpenVMS

[Bill Gunshannon]

In article <iqejkv$2ia$2 at dont-email.me>,
	glen herrmannsfeldt <gah at ugcs.caltech.edu> writes:
> Bill Gunshannon <billg999 at cs.uofs.edu> wrote:
> 
> (snip)
>  
>> But, all of this is, as usual, just plain silly.  The only thing needed
>> to get a long uptime is "time".  I could easily build a system that did
>> nothing and was backed up with emough power sources to guarantee it never
>> went down.  Eventually, it would have some ridiculous uptime and it would
>> have accomplished...   wait for it......  NOTHING.
> 
> For most, the disk has to keep running throughout.  For a diskless
> client off an NFS server, even that isn't needed.  (Diskless NFS
> clients survive a server reboot.)

Well, if you were considering possible disk failure, how about I build
a system with just a ramdisk?  :-)  No moving parts beyond electrons.

And talk about being old. Unless they have fixed it (which I
doubt as I never saw anyone in the linux crowd admit it was done
wrong) Linux versions of NFS are, in some way, stateful and a reboot
of the server requires a reboot of all the clients.  One of the
reasons I have resisted moving anything here to Linux as we rely
very heavily on NFS and I can't be rebooting all our clients if I
have to take the fileserver down for any reason.


>  
>> On another note, with all the VMing of systems today I wonder what would
>> happen if I built  a system started it running, took a snapshot, shut it
>> down and then restarted it from the snapshot (note, not reboot, restart)
>> 10 years later?  Would it report an uptime of 10 years?
> 
> I have seen ones where the TOD clock stopped while it was suspended.
> 
> Then again, running BACKUP on a Win2K dual processor box reports
> the time as twice the actual clock time.  (Presumably once for
> each processor.)

No practical reason, but it might be interesting to see what Hyper-V
does.

bill

-- 
Bill Gunshannon          |  de-moc-ra-cy (di mok' ra see) n.  Three wolves
billg999 at cs.scranton.edu |  and a sheep voting on what's for dinner.
University of Scranton   |
Scranton, Pennsylvania   |         #include <std.disclaimer.h>