Right ( but also was rebalancing cycle 2 day before pgs corrupted)
2015-08-21 2:23 GMT+03:00 Samuel Just <sjust@xxxxxxxxxx>:
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 <sjust@xxxxxxxxxx> 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.voloshanenko@xxxxxxxxx> wrote:
>> 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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