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Understanding Sync, Deltas, Perishable Deltas in iMonitor


Greetings!

I have two questions about which I'm hoping to get help:

My first question is regarding the meanings/differences of the columns
in iMonitor/Partition Synchronization (sync) Status. There are three
columns entitled "Last Successful Sync", "Maximum Ring Delta", and
"Replica's Perishable Data Delta".

I have a partition that has, for its values in those columns, 13:27,
52:41, and 13:25 respectively. (This particular partition is an IDM
Driver Set partition where there are few changes - I know those times
are large, but I've seen similar time relationships in other partitions
where data changes more-frequently.) For instance, on another partition
(for the same values, in that order), I see 8:41, 1:34, and 1:31,
respectively.

Looking at the values of the first partition, one would think that the
Perishable Data (the last of the three time values) would be closely
tied to the Last Successful Sync, assuming that "Perishable Data" is
data that hasn't fully synced around the ring yet.) On most of the
partitions, this is the case - those values are very close. However,
look at the second partition - the Perishable Data is only 1 minute, 31
seconds. But the last successful sync is 8 minutes and 41 seconds ago.

I can think of a reason this may happen - that the new data (or
changes) in this case are only 1:31 old and have yet to sync around.
However, the changes in this partition are fast-sync type of
changes...having them sit for 1:31 isn't likely. From what I've seen
it's not a case of being stuck in skulker hell, and the servers are not
constrained or resource-starved at all.

Which brings me to my second question - if there's better documentation
that would explain this (and other things for iMonitor) than what's in
the eDirectory documentation, if there's a secret link to it, I'd be
most-grateful if someone would point me in that direction.

Thanks Everyone!
Sam


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samthendsgod
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Anonymous_User Absent Member.
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Re: Understanding Sync, Deltas, Perishable Deltas in iMonitor


Does http://support.novell.com/techcenter/articles/anp20030201.html
help?

Last Successful Sync.

This value shows the amount of time since all the replicas of a given
partition successfully synchronized from the server. Since my server
only has one partition, only one time is listed. In my case, this
occured .004 of a second ago.

Maximum Ring Delta.

This value shows the amount of time it takes to synchronize all the
data that is waiting to be synchronized across the network. For example,
if you change your login script, and there's a maximum ring delta of 15
minutes, it will take a least 15 minutes for the updated login script to
be accessible from all partitions in your network. If Unknown is listed
under Maximum Delta Ring, then (due to synchronization issues) the
maximum Delta Ring cannot be caluculated. Wait a few minutes and check
back.

Replica's Perishable Data Delta.

This entry lists the amount of data on the partition which has yet to
be successfully replicated and would be lost if the server went down
immediately. For example, if you lost the hard drive where your
directory database (DIB) resides, the changes made on this machine in
the last time frame x (Perishable Data Delta) have not been replicated
to another machine and would be lost from the system, as if they had
never happened.


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ataubman
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Anonymous_User Absent Member.
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Re: Understanding Sync, Deltas, Perishable Deltas in iMonitor


(Andy, is it?) Thank you for posting this. It's exactly what I was
hoping to find. Now hopefully the next AppNote mentioned at the end of
the article is available, as it looks very informative as well.

Thank you again sir.
Sam


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Anonymous_User Absent Member.
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Re: Understanding Sync, Deltas, Perishable Deltas in iMonitor


(Don't ever call him "Andy" - its always "Andrew" :cool:)


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peterkuo
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