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High CPU-load - caused by "Ignoring stale resume trigger"?

Hi there,

I recently saw very high CPU load (around 90%) coupled with high disk utilization of between 65-90% on one node of a clustered FAS2040 system.

The nodes are simple snapvault destinations and are not serving any data, and since no deduplication and only two snapvault transfers were running I couldn't figure out why the system was under so much load.

Performance graphs of the system showed that it normally just trotted along at 2-3% CPU utilization, but since 08:00 this morning it had started having very high load instead.

I checked the logs on the filer, not finding anything suspicious in messages or any other, except for the etc/log/volread log. It showed lines like the following, several each second:

Wed Jan 25 08:00:22 CET Ignoring stale resume trigger (Backup UUID 00000000-0000-0000-0000-000000000000)

Wed Jan 25 08:00:36 CET Ignoring stale resume trigger (Backup UUID 00000000-0000-0000-0000-000000000000)

Wed Jan 25 08:00:36 CET Ignoring stale resume trigger (Backup UUID 00000000-0000-0000-0000-000000000000)

Wed Jan 25 08:00:36 CET Ignoring stale resume trigger (Backup UUID 00000000-0000-0000-0000-000000000000)

<cut>

Wed Jan 25 11:53:14 CET Ignoring stale resume trigger (Backup UUID 00000000-0000-0000-0000-000000000000)

Wed Jan 25 11:53:14 CET Ignoring stale resume trigger (Backup UUID 00000000-0000-0000-0000-000000000000)

Wed Jan 25 11:53:16 CET Ignoring stale resume trigger (Backup UUID 00000000-0000-0000-0000-000000000000)

Wed Jan 25 11:53:16 CET Ignoring stale resume trigger (Backup UUID 00000000-0000-0000-0000-000000000000)

Wed Jan 25 11:53:16 CET Ignoring stale resume trigger (Backup UUID 00000000-0000-0000-0000-000000000000)

These are the first and last entries in that log (of a total of 105321 lines!), and indeed the system now seems back to normal after 12:00.

Has anyone seen anything like this before? Could it happen again? This is an 8.0.2P3 7-mode release I might add.

Thanks and best regards,

Peter

Re: High CPU-load - caused by "Ignoring stale resume trigger"?

Hi,

Since you have not gotten an answer, you may want to ask this question in the NetApp Support Community.  The current customers, partners and internal Subject Matter Experts are addressing technical product questions there.

Mike