Yes I was also thinking of setting this configuration. But I am just wondering what are the drawbacks, if there are any? Why is the ceph team not making this a default setting if it is so good? -----Original Message----- To: ceph-users@ceph.io Subject: [ceph-users] Re: ceph mds slow requests Hi, although I've read many threads mentioning these two osd config options I didn't know what to expect of it. But since you explicitly referred the slow requests I decided to give it a try and changed 'osd op queue cut off' to "high" ('osd op queue' was already "wpq"). We've had two deep-scrub cycles since then, half of our PGs have been deep-scrubbed and I haven't seen a single slow request. So thanks again for pointing that out! Regards, Eugen Zitat von Andrej Filipcic <andrej.filipcic@ijs.si>:
Hi,
all our slow request issues were solved with: [osd] osd op queue = wpq osd op queue cut off = high
before we even had several hours old request, since the change it rarely gets above 30s even with the heaviest loads, eg >100 iops/hdd
Regards, Andrej
On 6/10/20 12:12 PM, Eugen Block wrote:
Hi,
we have this message almost daily, although in our case it's almost expected. We run a nightly compile job within a cephfs subtree and the OSDs (HDD with rocksDB on SSD) are saturated during those jobs. Also the deep-scrubs which also run during the night have a significant impact and the cluster reports slow requests, but since that happens outside our working hours we can live with it (for now).
You write the OSDs are on SSDs, is that true for both data and metadata pool?
Regards, Eugen
Zitat von locallocal <locallocal@163.com>:
hi,guys. we have a ceph cluster which version is luminous 12.2.13. and Recently we encountered a problem.here are some log infomations:
2020-06-08 12:33:52.706070 7f4097e2d700 0 log_channel(cluster) log [WRN] : slow request 30.518930 seconds old, received at 2020-06-08 12:33:22.186924: client_request(client.48978906:941633993 create #0x100028cab8a/.filename 2020-06-08 12:33:22.197434 caller_uid=0, caller_gid=0{}) currently submit entry: journal_and_reply ... 2020-06-08 13:12:17.826727 7f4097e2d700 0 log_channel(cluster) log [WRN] : slow request 2220.991833 seconds old, received at 2020-06-08 12:35:16.764233: client_request(client.42390705:788369155 create #0x1000224f999/.filename 2020-06-08 12:35:16.774553 caller_uid=0, caller_gid=0{}) currently submit entry: journal_and_reply
it looks like mds can't flush journal to osd of meta pool.but the osd type is ssd and the load is very low.this problem leads the client can't mount and the mds can't trim log. Is there anyone have encountered this problem.Please help!
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-- _____________________________________________________________ prof. dr. Andrej Filipcic, E-mail: Andrej.Filipcic@ijs.si Department of Experimental High Energy Physics - F9 Jozef Stefan Institute, Jamova 39, P.o.Box 3000 SI-1001 Ljubljana, Slovenia Tel.: +386-1-477-3674 Fax: +386-1-477-3166 ------------------------------------------------------------- _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-leave@ceph.io
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