ADSM-L

Randomizing Schedule Start Times

1997-07-25 12:29:28
Subject: Randomizing Schedule Start Times
From: Michael R Vogt <vogt AT AUK.NIST DOT GOV>
Date: Fri, 25 Jul 1997 12:29:28 -0400
Hi y'all,

On Wed, 23 Jul 1997 16:45:03 -0400 Jerry Lawson wrote:
> If you take the default (Which is Schedmode=polling), then what happens is 
> this:
>
> 1.  You start the scheduler task on the client.
> 2.  The scheduler task contacts the server.
> 3.  The server either tells him to come back in 12 hours (if the schedule 
> window
> is more than 12 hours away), or tells him when to come back to do the backup.
>

If randomization is not 0, does the server tell him to come back in 12 hours
IF THE RANDOMLY SCHEDULED TIME THAT THE SERVER CALCULATES FOR COMMAND EXECUTION
is more than 12 hours away?

For example, these 2 clients are associated with a schedule that starts at 7PM
and has a duration of 12 hours. Randomization is 50%.

client #1's daily "will be execute|refreshed":
07/19/97   08:20:18 Schedule will be refreshed in 12 hours.
07/19/97   20:20:16 Command will be executed in 4 hours and 7 minutes.
07/20/97   12:29:04 Command will be executed in 7 hours and 33 minutes.
07/21/97   08:03:41 Schedule will be refreshed in 12 hours.
07/21/97   20:03:40 Command will be executed in 1 hour and 50 minutes.
07/22/97   09:55:35 Command will be executed in 11 hours and 44 minutes.
07/23/97   09:42:08 Command will be executed in 11 hours and 42 minutes.
07/24/97   09:26:14 Command will be executed in 9 hours and 49 minutes.
07/25/97   07:17:03 Schedule will be refreshed in 12 hours.

client #2's daily "will be execute|refreshed":
07/19/97   10:12:01 Command will be executed in 10 hours and 41 minutes.
07/20/97   08:56:13 Schedule will be refreshed in 12 hours.
07/20/97   20:56:13 Command will be executed in 1 hour and 57 minutes.
07/21/97   10:57:09 Schedule will be refreshed in 12 hours.
07/21/97   22:57:12 Command will be executed in 1 hour and 44 minutes.
07/22/97   12:44:02 Command will be executed in 8 hours and 20 minutes.
07/23/97   09:07:17 Schedule will be refreshed in 12 hours.
07/23/97   17:08:35 Command will be executed in 7 hours and 25 minutes.
07/24/97   12:36:02 Command will be executed in 11 hours and 35 minutes.

Also, I'm trying to figure out if I should be running with randomization on.

I like the fact that the server randomizes start times - I'm a bit leary
about turning it off because of the warning re. communications errors in
the Admin Guide, but don't like the fact that I can't set randomization
higher than 50%.

And, I don't understand why the 50% limit "ensures that half of the
startup window is available for retrying scheduled commands that have
failed." Whenever I have a client failure, it retries in 20 minutes,
regardless of what half of the startup window it's in.

Can I get any free (or almost free) advice from anyone? ;-)

Thanks,
Michael
<Prev in Thread] Current Thread [Next in Thread>