ISTR that the Ceph slow op threshold defaults to 30 or 32 seconds. Naturally an op over the threshold often means there are more below the reporting threshold. 120s I think is the default Linux op timeout. > On Apr 6, 2024, at 10:53 AM, David C. <david.casier@xxxxxxxx> wrote: > > Hi, > > Do slow ops impact data integrity => No > Can I generally ignore it => No :) > > This means that some client transactions are blocked for 120 sec (that's a > lot). > This could be a lock on the client side (CephFS, essentially), an incident > on the infrastructure side (a disk about to fall, network instability, > etc.), ... > > When this happens, you need to look at the blocked requests. > If you systematically see an osd ID, then look at dmesg and the SMART of > the disk. > > This can also be an architectural problem (for example, high IOPS load with > osdmap on HDD, all multiplied by the erasure code) > > *David* > > >> Le ven. 5 avr. 2024 à 19:42, adam.ther <adam.ther@xxxxxxx> a écrit : >> >> Hello, >> >> Do slow ops impact data integrity or can I generally ignore it? I'm >> loading 3 hosts with a 10GB link and it saturating the disks or the OSDs. >> >> 2024-04-05T15:33:10.625922+0000 mon.CEPHADM-1 [WRN] Health check >> update: 3 slow ops, oldest one blocked for 117 sec, daemons >> [osd.0,osd.13,osd.14,osd.17,osd.3,osd.4,osd.9] have slow ops. >> (SLOW_OPS) >> >> 2024-04-05T15:33:15.628271+0000 mon.CEPHADM-1 [WRN] Health check >> update: 2 slow ops, oldest one blocked for 123 sec, daemons >> [osd.0,osd.1,osd.14,osd.17,osd.3,osd.4,osd.9] have slow ops. (SLOW_OPS) >> >> I guess more to the point, what the impact here? >> >> Thanks, >> >> Adam >> >> >> _______________________________________________ >> ceph-users mailing list -- ceph-users@xxxxxxx >> To unsubscribe send an email to ceph-users-leave@xxxxxxx >> > _______________________________________________ > ceph-users mailing list -- ceph-users@xxxxxxx > To unsubscribe send an email to ceph-users-leave@xxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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