Failover concept clarification
David W. Hankins
dhankins at isc.org
Tue Jul 7 18:04:23 UTC 2009
On Tue, Jul 07, 2009 at 04:49:54PM +0530, pat wrote:
> What will be the time to expire before my secondary responds to all the
> clients request?
Load balancing is only engaged in 'normal' state. In all other
operating states, the server will always answer as best it can.
> is it 00hr:09min:41sec + 1800 sec = 00hr:39min:41sec so my secondary server
> will wait for 39min and 41 sec before answering all my clients request.
>
> how do i calculate the STOS+MCLT time.
You got this right. This time effectively determines when the
partner's free lease pool will be available for allocation to new
clients, although this is actually a case-by-case basis on each
individual lease. The actual time is TSFP+MCLT or STOS+MCLT,
whichever is further in the future. Generally free leases have a
TSFP that is in the past, so STOS+MCLT is the effective measure.
However, expired leases, or leases reaching expiry, may have a
TSFP that is still in the future (the TSFP lags ahead of lease
expiration so that leases may be extended to lease-times greater
than MCLT).
STOS+MCLT doesn't affect LBA.
--
David W. Hankins "If you don't do it right the first time,
Software Engineer you'll just have to do it again."
Internet Systems Consortium, Inc. -- Jack T. Hankins
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