I mean in forward mode - it;s permanent problem - snapshots not working. And for writeback mode after we change max_bytes/object values, it;s around 30 by 70... 70% of time it;s works... 30% - not. Looks like for old images - snapshots works fine (images which already exists before we change values). For any new images - no
2015-08-21 2:21 GMT+03:00 Voloshanenko Igor <igor.voloshanenko@xxxxxxxxx>:
Right. But issues started...2015-08-21 2:20 GMT+03:00 Samuel Just <sjust@xxxxxxxxxx>:But that was still in writeback mode, right?
-Sam
On Thu, Aug 20, 2015 at 4:18 PM, Voloshanenko Igor
<igor.voloshanenko@xxxxxxxxx> 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 <sjust@xxxxxxxxxx>:
>>
>> 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.voloshanenko@xxxxxxxxx> 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 <sjust@xxxxxxxxxx>:
>> >>
>> >> 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.voloshanenko@xxxxxxxxx> wrote:
>> >> > Good joke )))))))))
>> >> >
>> >> > 2015-08-21 2:06 GMT+03:00 Samuel Just <sjust@xxxxxxxxxx>:
>> >> >>
>> >> >> Certainly, don't reproduce this with a cluster you care about :).
>> >> >> -Sam
>> >> >>
>> >> >> On Thu, Aug 20, 2015 at 4:02 PM, Samuel Just <sjust@xxxxxxxxxx>
>> >> >> 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.voloshanenko@xxxxxxxxx> 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.voloshanenko@xxxxxxxxx>:
>> >> >> >>>
>> >> >> >>> 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 <sjust@xxxxxxxxxx>:
>> >> >> >>>>
>> >> >> >>>> Also, can you include the kernel version?
>> >> >> >>>> -Sam
>> >> >> >>>>
>> >> >> >>>> On Thu, Aug 20, 2015 at 3:51 PM, Samuel Just <sjust@xxxxxxxxxx>
>> >> >> >>>> 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.panic@xxxxxxxxx> 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.voloshanenko@xxxxxxxxx>
>> >> >> >>>> >> 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@xxxxxxxxxxxxxx
>> >> >> >>>> >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>> >> >> >>>> >>>
>> >> >> >>>> >>
>> >> >> >>>> >>
>> >> >> >>>> >>
>> >> >> >>>> >> --
>> >> >> >>>> >>
>> >> >> >>>> >> Andrija Panić
>> >> >> >>>> >>
>> >> >> >>>> >> _______________________________________________
>> >> >> >>>> >> ceph-users mailing list
>> >> >> >>>> >> ceph-users@xxxxxxxxxxxxxx
>> >> >> >>>> >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>> >> >> >>>> >>
>> >> >> >>>
>> >> >> >>>
>> >> >> >>
>> >> >
>> >> >
>> >
>> >
>
>
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