Right. But issues started... 2015-08-21 2:20 GMT+03:00 Samuel Just <[email protected]>:
> But that was still in writeback mode, right? > -Sam > > On Thu, Aug 20, 2015 at 4:18 PM, Voloshanenko Igor > <[email protected]> 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 <[email protected]>: > >> > >> 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 > >> <[email protected]> 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 <[email protected]>: > >> >> > >> >> 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 > >> >> <[email protected]> wrote: > >> >> > Good joke ))))))))) > >> >> > > >> >> > 2015-08-21 2:06 GMT+03:00 Samuel Just <[email protected]>: > >> >> >> > >> >> >> Certainly, don't reproduce this with a cluster you care about :). > >> >> >> -Sam > >> >> >> > >> >> >> On Thu, Aug 20, 2015 at 4:02 PM, Samuel Just <[email protected]> > >> >> >> 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 > >> >> >> > <[email protected]> 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 > >> >> >> >> <[email protected]>: > >> >> >> >>> > >> >> >> >>> 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 <[email protected]>: > >> >> >> >>>> > >> >> >> >>>> Also, can you include the kernel version? > >> >> >> >>>> -Sam > >> >> >> >>>> > >> >> >> >>>> On Thu, Aug 20, 2015 at 3:51 PM, Samuel Just < > [email protected]> > >> >> >> >>>> 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 > >> >> >> >>>> > <[email protected]> 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 > >> >> >> >>>> >> <[email protected]> > >> >> >> >>>> >> 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 > >> >> >> >>>> >>> [email protected] > >> >> >> >>>> >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > >> >> >> >>>> >>> > >> >> >> >>>> >> > >> >> >> >>>> >> > >> >> >> >>>> >> > >> >> >> >>>> >> -- > >> >> >> >>>> >> > >> >> >> >>>> >> Andrija Panić > >> >> >> >>>> >> > >> >> >> >>>> >> _______________________________________________ > >> >> >> >>>> >> ceph-users mailing list > >> >> >> >>>> >> [email protected] > >> >> >> >>>> >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > >> >> >> >>>> >> > >> >> >> >>> > >> >> >> >>> > >> >> >> >> > >> >> > > >> >> > > >> > > >> > > > > > >
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