Hey Venky, thank you for your reply!
Am 16.02.2026 um 08:34 schrieb Venky Shankar via ceph-users <ceph-users@ceph.io>:
Hi Martin,
Could you additionally do a minute worth of MDS perf dump captures at 5 second intervals during the observed slowness? This can be done using
ceph tell mds.<id> perf dump
and pipe the result to separate (time-stamped) files and share those.
I am attaching a tarball with the perf dumps alongside the wall clock profiles generated at the same time. Please note that when running gdbpmp on the MDS, it appears to stall / hang so that after a while, the MONs declare the rank failed and initiate a fail-over. I am not sure that is supposed to be this way … I am seeing SIGINT messages in those moments in the logs. At such events, the „perf dump“ Generated would be empty. Best regards Martin -- Martin Gerhard Loschwitz Geschäftsführer / CEO, True West IT Services GmbH Phone: +49 2433 5253130 Mobile: +49 176 61832178 Address: Schmiedegasse 24a, 41836 Hückelhoven, Germany Legal: HRB 21985, Amtsgericht Mönchengladbach VAT: DE363893844 True West IT Services GmbH is compliant with the GDPR regulation on data protection and privacy in the European Union and the European Economic Area. You can request the information on how we collect and process your private data according to the law by contacting the email sender.
On Wed, Feb 18, 2026 at 6:05 PM Martin Gerhard Loschwitz <martin.loschwitz@true-west.com> wrote:
Hey Venky,
thank you for your reply!
Am 16.02.2026 um 08:34 schrieb Venky Shankar via ceph-users <ceph-users@ceph.io>:
Hi Martin,
Could you additionally do a minute worth of MDS perf dump captures at 5 second intervals during the observed slowness? This can be done using
ceph tell mds.<id> perf dump
and pipe the result to separate (time-stamped) files and share those.
I am attaching a tarball with the perf dumps alongside the wall clock profiles generated at the same time. Please note that when running gdbpmp on the MDS, it appears to stall / hang so that after a while, the MONs declare the rank failed and initiate a fail-over. I am not sure that is supposed to be this way … I am seeing SIGINT messages in those moments in the logs. At such events, the „perf dump“ Generated would be empty.
Noted. I shall have a look today.
Best regards Martin
-- Martin Gerhard Loschwitz Geschäftsführer / CEO, True West IT Services GmbH Phone: +49 2433 5253130 Mobile: +49 176 61832178 Address: Schmiedegasse 24a, 41836 Hückelhoven, Germany Legal: HRB 21985, Amtsgericht Mönchengladbach VAT: DE363893844
True West IT Services GmbH is compliant with the GDPR regulation on data protection and privacy in the European Union and the European Economic Area. You can request the information on how we collect and process your private data according to the law by contacting the email sender.
-- Cheers, Venky
participants (2)
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Martin Gerhard Loschwitz
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Venky Shankar