Right ( but also was rebalancing cycle 2 day before pgs corrupted) 2015-08-21 2:23 GMT+03:00 Samuel Just <sj...@redhat.com>:
> Specifically, the snap behavior (we already know that the pgs went > inconsistent while the pool was in writeback mode, right?). > -Sam > > On Thu, Aug 20, 2015 at 4:22 PM, Samuel Just <sj...@redhat.com> wrote: > > Yeah, I'm trying to confirm that the issues did happen in writeback mode. > > -Sam > > > > On Thu, Aug 20, 2015 at 4:21 PM, Voloshanenko Igor > > <igor.voloshane...@gmail.com> wrote: > >> Right. But issues started... > >> > >> 2015-08-21 2:20 GMT+03:00 Samuel Just <sj...@redhat.com>: > >>> > >>> But that was still in writeback mode, right? > >>> -Sam > >>> > >>> On Thu, Aug 20, 2015 at 4:18 PM, Voloshanenko Igor > >>> <igor.voloshane...@gmail.com> wrote: > >>> > WE haven't set values for max_bytes / max_objects.. and all data > >>> > initially > >>> > writes only to cache layer and not flushed at all to cold layer. > >>> > > >>> > Then we received notification from monitoring that we collect about > >>> > 750GB in > >>> > hot pool ) So i changed values for max_object_bytes to be 0,9 of disk > >>> > size... And then evicting/flushing started... > >>> > > >>> > And issue with snapshots arrived > >>> > > >>> > 2015-08-21 2:15 GMT+03:00 Samuel Just <sj...@redhat.com>: > >>> >> > >>> >> Not sure what you mean by: > >>> >> > >>> >> but it's stop to work in same moment, when cache layer fulfilled > with > >>> >> data and evict/flush started... > >>> >> -Sam > >>> >> > >>> >> On Thu, Aug 20, 2015 at 4:11 PM, Voloshanenko Igor > >>> >> <igor.voloshane...@gmail.com> wrote: > >>> >> > No, when we start draining cache - bad pgs was in place... > >>> >> > We have big rebalance (disk by disk - to change journal side on > both > >>> >> > hot/cold layers).. All was Ok, but after 2 days - arrived scrub > >>> >> > errors > >>> >> > and 2 > >>> >> > pgs inconsistent... > >>> >> > > >>> >> > In writeback - yes, looks like snapshot works good. but it's stop > to > >>> >> > work in > >>> >> > same moment, when cache layer fulfilled with data and evict/flush > >>> >> > started... > >>> >> > > >>> >> > > >>> >> > > >>> >> > 2015-08-21 2:09 GMT+03:00 Samuel Just <sj...@redhat.com>: > >>> >> >> > >>> >> >> So you started draining the cache pool before you saw either the > >>> >> >> inconsistent pgs or the anomalous snap behavior? (That is, > >>> >> >> writeback > >>> >> >> mode was working correctly?) > >>> >> >> -Sam > >>> >> >> > >>> >> >> On Thu, Aug 20, 2015 at 4:07 PM, Voloshanenko Igor > >>> >> >> <igor.voloshane...@gmail.com> wrote: > >>> >> >> > Good joke ))))))))) > >>> >> >> > > >>> >> >> > 2015-08-21 2:06 GMT+03:00 Samuel Just <sj...@redhat.com>: > >>> >> >> >> > >>> >> >> >> Certainly, don't reproduce this with a cluster you care about > :). > >>> >> >> >> -Sam > >>> >> >> >> > >>> >> >> >> On Thu, Aug 20, 2015 at 4:02 PM, Samuel Just < > sj...@redhat.com> > >>> >> >> >> wrote: > >>> >> >> >> > What's supposed to happen is that the client transparently > >>> >> >> >> > directs > >>> >> >> >> > all > >>> >> >> >> > requests to the cache pool rather than the cold pool when > there > >>> >> >> >> > is > >>> >> >> >> > a > >>> >> >> >> > cache pool. If the kernel is sending requests to the cold > >>> >> >> >> > pool, > >>> >> >> >> > that's probably where the bug is. Odd. It could also be a > bug > >>> >> >> >> > specific 'forward' mode either in the client or on the osd. > >>> >> >> >> > Why > >>> >> >> >> > did > >>> >> >> >> > you have it in that mode? > >>> >> >> >> > -Sam > >>> >> >> >> > > >>> >> >> >> > On Thu, Aug 20, 2015 at 3:58 PM, Voloshanenko Igor > >>> >> >> >> > <igor.voloshane...@gmail.com> wrote: > >>> >> >> >> >> We used 4.x branch, as we have "very good" Samsung 850 pro > in > >>> >> >> >> >> production, > >>> >> >> >> >> and they don;t support ncq_trim... > >>> >> >> >> >> > >>> >> >> >> >> And 4,x first branch which include exceptions for this in > >>> >> >> >> >> libsata.c. > >>> >> >> >> >> > >>> >> >> >> >> sure we can backport this 1 line to 3.x branch, but we > prefer > >>> >> >> >> >> no > >>> >> >> >> >> to > >>> >> >> >> >> go > >>> >> >> >> >> deeper if packege for new kernel exist. > >>> >> >> >> >> > >>> >> >> >> >> 2015-08-21 1:56 GMT+03:00 Voloshanenko Igor > >>> >> >> >> >> <igor.voloshane...@gmail.com>: > >>> >> >> >> >>> > >>> >> >> >> >>> root@test:~# uname -a > >>> >> >> >> >>> Linux ix-s5 4.0.4-040004-generic #201505171336 SMP Sun > May 17 > >>> >> >> >> >>> 17:37:22 > >>> >> >> >> >>> UTC > >>> >> >> >> >>> 2015 x86_64 x86_64 x86_64 GNU/Linux > >>> >> >> >> >>> > >>> >> >> >> >>> 2015-08-21 1:54 GMT+03:00 Samuel Just <sj...@redhat.com>: > >>> >> >> >> >>>> > >>> >> >> >> >>>> Also, can you include the kernel version? > >>> >> >> >> >>>> -Sam > >>> >> >> >> >>>> > >>> >> >> >> >>>> On Thu, Aug 20, 2015 at 3:51 PM, Samuel Just > >>> >> >> >> >>>> <sj...@redhat.com> > >>> >> >> >> >>>> wrote: > >>> >> >> >> >>>> > Snapshotting with cache/tiering *is* supposed to work. > >>> >> >> >> >>>> > Can > >>> >> >> >> >>>> > you > >>> >> >> >> >>>> > open a > >>> >> >> >> >>>> > bug? > >>> >> >> >> >>>> > -Sam > >>> >> >> >> >>>> > > >>> >> >> >> >>>> > On Thu, Aug 20, 2015 at 3:36 PM, Andrija Panic > >>> >> >> >> >>>> > <andrija.pa...@gmail.com> wrote: > >>> >> >> >> >>>> >> This was related to the caching layer, which doesnt > >>> >> >> >> >>>> >> support > >>> >> >> >> >>>> >> snapshooting per > >>> >> >> >> >>>> >> docs...for sake of closing the thread. > >>> >> >> >> >>>> >> > >>> >> >> >> >>>> >> On 17 August 2015 at 21:15, Voloshanenko Igor > >>> >> >> >> >>>> >> <igor.voloshane...@gmail.com> > >>> >> >> >> >>>> >> wrote: > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> Hi all, can you please help me with unexplained > >>> >> >> >> >>>> >>> situation... > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> All snapshot inside ceph broken... > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> So, as example, we have VM template, as rbd inside > ceph. > >>> >> >> >> >>>> >>> We can map it and mount to check that all ok with it > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> root@test:~# rbd map > >>> >> >> >> >>>> >>> cold-storage/0e23c701-401d-4465-b9b4-c02939d57bb5 > >>> >> >> >> >>>> >>> /dev/rbd0 > >>> >> >> >> >>>> >>> root@test:~# parted /dev/rbd0 print > >>> >> >> >> >>>> >>> Model: Unknown (unknown) > >>> >> >> >> >>>> >>> Disk /dev/rbd0: 10.7GB > >>> >> >> >> >>>> >>> Sector size (logical/physical): 512B/512B > >>> >> >> >> >>>> >>> Partition Table: msdos > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> Number Start End Size Type File system > >>> >> >> >> >>>> >>> Flags > >>> >> >> >> >>>> >>> 1 1049kB 525MB 524MB primary ext4 > >>> >> >> >> >>>> >>> boot > >>> >> >> >> >>>> >>> 2 525MB 10.7GB 10.2GB primary > >>> >> >> >> >>>> >>> lvm > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> Than i want to create snap, so i do: > >>> >> >> >> >>>> >>> root@test:~# rbd snap create > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> > cold-storage/0e23c701-401d-4465-b9b4-c02939d57bb5@new_snap > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> And now i want to map it: > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> root@test:~# rbd map > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> > cold-storage/0e23c701-401d-4465-b9b4-c02939d57bb5@new_snap > >>> >> >> >> >>>> >>> /dev/rbd1 > >>> >> >> >> >>>> >>> root@test:~# parted /dev/rbd1 print > >>> >> >> >> >>>> >>> Warning: Unable to open /dev/rbd1 read-write > (Read-only > >>> >> >> >> >>>> >>> file > >>> >> >> >> >>>> >>> system). > >>> >> >> >> >>>> >>> /dev/rbd1 has been opened read-only. > >>> >> >> >> >>>> >>> Warning: Unable to open /dev/rbd1 read-write > (Read-only > >>> >> >> >> >>>> >>> file > >>> >> >> >> >>>> >>> system). > >>> >> >> >> >>>> >>> /dev/rbd1 has been opened read-only. > >>> >> >> >> >>>> >>> Error: /dev/rbd1: unrecognised disk label > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> Even md5 different... > >>> >> >> >> >>>> >>> root@ix-s2:~# md5sum /dev/rbd0 > >>> >> >> >> >>>> >>> 9a47797a07fee3a3d71316e22891d752 /dev/rbd0 > >>> >> >> >> >>>> >>> root@ix-s2:~# md5sum /dev/rbd1 > >>> >> >> >> >>>> >>> e450f50b9ffa0073fae940ee858a43ce /dev/rbd1 > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> Ok, now i protect snap and create clone... but same > >>> >> >> >> >>>> >>> thing... > >>> >> >> >> >>>> >>> md5 for clone same as for snap,, > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> root@test:~# rbd unmap /dev/rbd1 > >>> >> >> >> >>>> >>> root@test:~# rbd snap protect > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> > cold-storage/0e23c701-401d-4465-b9b4-c02939d57bb5@new_snap > >>> >> >> >> >>>> >>> root@test:~# rbd clone > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> > cold-storage/0e23c701-401d-4465-b9b4-c02939d57bb5@new_snap > >>> >> >> >> >>>> >>> cold-storage/test-image > >>> >> >> >> >>>> >>> root@test:~# rbd map cold-storage/test-image > >>> >> >> >> >>>> >>> /dev/rbd1 > >>> >> >> >> >>>> >>> root@test:~# md5sum /dev/rbd1 > >>> >> >> >> >>>> >>> e450f50b9ffa0073fae940ee858a43ce /dev/rbd1 > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> .... but it's broken... > >>> >> >> >> >>>> >>> root@test:~# parted /dev/rbd1 print > >>> >> >> >> >>>> >>> Error: /dev/rbd1: unrecognised disk label > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> ========= > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> tech details: > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> root@test:~# ceph -v > >>> >> >> >> >>>> >>> ceph version 0.94.2 > >>> >> >> >> >>>> >>> (5fb85614ca8f354284c713a2f9c610860720bbf3) > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> We have 2 inconstistent pgs, but all images not > placed > >>> >> >> >> >>>> >>> on > >>> >> >> >> >>>> >>> this > >>> >> >> >> >>>> >>> pgs... > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> root@test:~# ceph health detail > >>> >> >> >> >>>> >>> HEALTH_ERR 2 pgs inconsistent; 18 scrub errors > >>> >> >> >> >>>> >>> pg 2.490 is active+clean+inconsistent, acting > [56,15,29] > >>> >> >> >> >>>> >>> pg 2.c4 is active+clean+inconsistent, acting > [56,10,42] > >>> >> >> >> >>>> >>> 18 scrub errors > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> ============ > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> root@test:~# ceph osd map cold-storage > >>> >> >> >> >>>> >>> 0e23c701-401d-4465-b9b4-c02939d57bb5 > >>> >> >> >> >>>> >>> osdmap e16770 pool 'cold-storage' (2) object > >>> >> >> >> >>>> >>> '0e23c701-401d-4465-b9b4-c02939d57bb5' -> pg > 2.74458f70 > >>> >> >> >> >>>> >>> (2.770) > >>> >> >> >> >>>> >>> -> up > >>> >> >> >> >>>> >>> ([37,15,14], p37) acting ([37,15,14], p37) > >>> >> >> >> >>>> >>> root@test:~# ceph osd map cold-storage > >>> >> >> >> >>>> >>> 0e23c701-401d-4465-b9b4-c02939d57bb5@snap > >>> >> >> >> >>>> >>> osdmap e16770 pool 'cold-storage' (2) object > >>> >> >> >> >>>> >>> '0e23c701-401d-4465-b9b4-c02939d57bb5@snap' -> pg > >>> >> >> >> >>>> >>> 2.793cd4a3 > >>> >> >> >> >>>> >>> (2.4a3) > >>> >> >> >> >>>> >>> -> up > >>> >> >> >> >>>> >>> ([12,23,17], p12) acting ([12,23,17], p12) > >>> >> >> >> >>>> >>> root@test:~# ceph osd map cold-storage > >>> >> >> >> >>>> >>> 0e23c701-401d-4465-b9b4-c02939d57bb5@test-image > >>> >> >> >> >>>> >>> osdmap e16770 pool 'cold-storage' (2) object > >>> >> >> >> >>>> >>> '0e23c701-401d-4465-b9b4-c02939d57bb5@test-image' > -> pg > >>> >> >> >> >>>> >>> 2.9519c2a9 > >>> >> >> >> >>>> >>> (2.2a9) > >>> >> >> >> >>>> >>> -> up ([12,44,23], p12) acting ([12,44,23], p12) > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> Also we use cache layer, which in current moment - in > >>> >> >> >> >>>> >>> forward > >>> >> >> >> >>>> >>> mode... > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> Can you please help me with this.. As my brain stop > to > >>> >> >> >> >>>> >>> understand > >>> >> >> >> >>>> >>> what is > >>> >> >> >> >>>> >>> going on... > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> Thank in advance! > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >>> _______________________________________________ > >>> >> >> >> >>>> >>> ceph-users mailing list > >>> >> >> >> >>>> >>> ceph-users@lists.ceph.com > >>> >> >> >> >>>> >>> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > >>> >> >> >> >>>> >>> > >>> >> >> >> >>>> >> > >>> >> >> >> >>>> >> > >>> >> >> >> >>>> >> > >>> >> >> >> >>>> >> -- > >>> >> >> >> >>>> >> > >>> >> >> >> >>>> >> Andrija Panić > >>> >> >> >> >>>> >> > >>> >> >> >> >>>> >> _______________________________________________ > >>> >> >> >> >>>> >> ceph-users mailing list > >>> >> >> >> >>>> >> ceph-users@lists.ceph.com > >>> >> >> >> >>>> >> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > >>> >> >> >> >>>> >> > >>> >> >> >> >>> > >>> >> >> >> >>> > >>> >> >> >> >> > >>> >> >> > > >>> >> >> > > >>> >> > > >>> >> > > >>> > > >>> > > >> > >> >
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