SnapMirror Lag Thresholds per Relationship

paul2018

We have a large number of unmanaged SnapMirror and Vault relationships that are monitored by OCUM 9.5. Most of these are vaults that have a 12 hour lag, but we have some mirror volumes that replicate every 5 minutes.

Unfortunately the global "Lag Thresholds for Unmanaged Relationships" doesn't fit both types of relationships. e.g.

Warning is set to 150%

Error is set to 250%

Our 5 minute SnapMirror relationship produces an error if the lag exceeds 12m min 30 sec

Our 12 hour Vault relationship would produce an error after 30 hours.

There's one particular mirror relationship that exceeds the error threshold overnight whilst it processes data. We aren't concerned by the lag, but we do find it onerous that it generates an alert every day which in turn goes to our incident ticketing system. 

If we increased the error threshold to only alert after 30 mins on the 5 min relationship (600%), it would mean we only receive a notification for failed backups after almost 3 days!

Is there a way to set thresholds per relationship? If not, are there any plans to introduce this in future versions?

Thanks,

Paul.

niels

Hi Paul,

I agree that the threshold is pretty generic. Nonetheless it follows a rule.

150% means you missed one update, 200% means you missed two. That's irrespective of the time between updates (as you correctly noted). Unfortunately there is nothing you can do about it in OCUM.

Now - you say the lag is expected as updates just take longer during the night.

So you can't change the thresholds in OCUM on a per relationship bases, but how about accounting for the longer updates in your snapmirror schedule?

I assume you currently have a pretty simple schedule, meaning just every 5min.

How about you building a slightly more sophisticated schedule that accounts for the longer update times at night?

With that OCUM will apply the 150% and 200% Threshold to each intervall individually. So lets say you keep 5min from 8am to 8pm, but change to 20min from 8pm to 8am, then alerts would only be triggered by lagtimes of 30min or more at night, but 7.5min and 10min respectively during the day.

Kind regards, Niels

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