Hi,
When you are in pooling mode this is the client who initiate de backup.
(Immediate client action will not works very fine, it may depend of you
query sched period). Each X hours the client contact the server to know when
is the next backup. Then it sleep until the right time. When the backup
start the server check also is there enough session available, if not client
stop and restart few minutes later and so on ...

I used Prompted for Servers (100-150 Srv)
Pooling for PC backup (+ Random 08:00AM to 08:00PM) more than 1000. It
reduce also the number of message due to PC off that server can not join.

Regards,
Eric

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Nancy Reeves
Sent: Monday, December 22, 2003 4:28 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Prompted vs. Polling


I'm trying to gather some statistics on how long scheduled backups take and
have discovered that things seem to be reported differently for clients that
are polling vs. prompted. I understand that with polling, the schedule
randomization percentage is used, and with prompted the server contacts all
nodes associated with a particular schedule at the same time (within a
couple of minutes).

A "q ev" gives me this for a prompted node.
  Scheduled Start: 12/19/03 03:00:00
  Actual Start: 12/19/03 04:28:01
  Completed: 12/19/03 04:28:04

And the activity log has these messages for that node. So it appears that
the Actual Start in the "q ev" is just for the session of writing the stats.

12/19/03 03:00:12     ANR2561I Schedule prompter contacting BXXXXX
(session
                       11625) to start a scheduled operation.
12/19/03 03:00:17     ANR0406I Session 11636 started for node BXXXXX
(WinNT)
                       (Tcp/Ip 156.26.xxx.xxx(4710)).
... various 'file in use' messages
12/19/03 04:28:01     ANR0406I Session 11745 started for node BXXXXX
(WinNT)
                       (Tcp/Ip 156.26.xxx.xxx(2328)).
12/19/03 04:28:04     ANE4964I (Session: 11745, Node: BXXXXX)  Elapsed
                       processing time:            01:27:44

For a polling node, I don't get the ANR2561I message.  This example has a
12:00 scheduled start.

12/18/03 12:11:55     ANR0406I Session 10983 started for node RXXXXX
(WinNT)
                       (Tcp/Ip 156.26.xxx.xxx(3714)).
12/18/03 12:12:56     ANR0406I Session 10984 started for node RXXXXX
(WinNT)
                       (Tcp/Ip 156.26.xxx.xxx(3715)).
... various 'file in use' messages
12/18/03 12:25:16     ANR0403I Session 10984 ended for node RXXXXX
(WinNT).
12/18/03 12:25:17     ANE4964I (Session: 10983, Node: RXXXXX)  Elapsed
                       processing time:            00:13:20

The "q ev" commands gives an Actual Start time that matches the activity
log.
  Scheduled Start: 12/18/03 12:00:00
  Actual Start: 12/18/03 12:11:55
  Completed: 12/18/03 12:25:17


My questions for you all are:
How do you check stats for scheduled backup durations?
What are some reasons for choosing polling vs. prompted?

Thanks for the input.


Nancy Reeves
Technical Support, Wichita State University
Nancy.Reeves AT wichita DOT edu          316-978-3860