[OpenAFS] sudden crash

[Derek Atkins]

Note that with a probe interval of 30 seconds and 10,000 clients you
now have an average probe rate of approximately 333 packets per
second.  The fileserver needs to respond to this load before you even
consider your actual file service load for data packets.

Are you sure this is what you want?  At the 10 minute interval you
get a more decent 16 probes/second.

Think HARD before you really change these timeouts.  Note that users
can always type "fs checks -all" to force the probes.

-derek

Nathan Neulinger <nneul@umr.edu> writes:

> I build with:
> 
> CFLAGS="${CFLAGS} -DAFS_RXDEADTIME=10 -DDEFAULT_PROBE_INTERVAL=30"
> MT_CFLAGS="${MT_CFLAGS} -DAFS_RXDEADTIME=10 -DDEFAULT_PROBE_INTERVAL=30"
> XCFLAGS="${XCFLAGS} -DAFS_RXDEADTIME=10 -DDEFAULT_PROBE_INTERVAL=30"
> 
> If the client detected the server failure, then it wouldn't come apart.
> The problem is that in some types of server failures, the client doesn't
> see it, and never switches to alternate sources.
> 
> -- Nathan
> 
> On Thu, 2002-08-01 at 03:37, Turbo Fredriksson wrote:
> > >>>>> "Neulinger" == Neulinger, Nathan <nneul@umr.edu> writes:
> > 
> >     Neulinger> Nope. And in fact, recovery when servers come back is
> >     Neulinger> usually instantaneous, except if the server outage
> >     Neulinger> killed the machine. (I.e.  running web out of afs
> >     Neulinger> resulting in thousands of hung requests). In those
> >     Neulinger> cases, the client machine doesn't usually recover.
> > 
> > Nice! What value have you put there? Would 10 seconds be to small
> > a value? And I assume that the client wouldn't survive even if
> > the default values where used.
> > 
> > I'm just wondering why the default is so high - 50 seconds - and
> > not something 'reasonable' like 10-15 sec... ?
> > -- 
> > tritium Qaddafi Clinton Honduras radar 747 president security Waco,
> > Texas Iran Ft. Bragg cracking nitrate Cocaine strategic
> > [See http://www.aclu.org/echelonwatch/index.html for more about this]
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> -- 
> 
> ------------------------------------------------------------
> Nathan Neulinger                       EMail:  nneul@umr.edu
> University of Missouri - Rolla         Phone: (573) 341-4841
> Computing Services                       Fax: (573) 341-4216
> 
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-- 
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
       URL: http://web.mit.edu/warlord/    PP-ASEL-IA     N1NWH
       warlord@MIT.EDU                        PGP key available