29 May
2020
29 May
'20
7:38 a.m.
Dear Igor,
thanks a lot for your assistance. We're still trying to bring OSDs back
up... the cluster is not in a great shape right now.
so the log from the ticket I can see a huge ((400+ MB)
bluefs log
kept over many small non-adjustent extents.
Presumably it was caused by either setting small
bluefs_alloc_size or
high disk space fragmentation or both. Now I'd like more details on
your OSDs.
Could you please collect OSD startup log with
debug_bluefs set to 20?
Yes, I now have such a log from an OSD that crashed with the assertion
in the subject after about 30 seconds. The log file is about 850'000
lines / 100 MB in size. How can I make it available to you?
Also please run the following commands for broken OSD
(need results
only, no need to collect the log unless they're failing):
ceph-bluestore-tool --path <path-to-osd>
--command bluefs-bdev-sizes
----------------------------------------------------------------------
inferring bluefs devices from bluestore path
slot 2 /var/lib/ceph/osd/ceph-46/block -> /dev/dm-7
slot 1 /var/lib/ceph/osd/ceph-46/block.db -> /dev/dm-17
1 : device size 0xa74c00000 : own 0x[2000~6b4bfe000] = 0x6b4bfe000 : using 0x6b4bfe000(27
GiB)
2 : device size 0x74702000000 : own 0x[37e3e600000~4a85400000] = 0x4a85400000 : using
0x4a85400000(298 GiB)
----------------------------------------------------------------------
ceph-bluestore-tool --path <path-to-osd>
--command free-score
----------------------------------------------------------------------
block:
{
"fragmentation_rating": 0.84012572151981013
}
bluefs-db:
{
"fragmentation_rating": -nan
}
failure querying 'bluefs-wal'
2020-05-29 16:31:54.882 7fec3c89cd80 -1 asok(0x55c4ec574000) AdminSocket: request
'{"prefix": "bluestore allocator score bluefs-wal"}' not
defined
----------------------------------------------------------------------
See anything interesting?
--
Simon.
Thanks,
Igor
On 5/29/2020 1:05 PM, Simon Leinen wrote:
> Colleague of Harry's here...
>
> Harald Staub writes:
>> This is again about our bad cluster, with too much objects, and the
>> hdd OSDs have a DB device that is (much) too small (e.g. 20 GB, i.e. 3
>> GB usable). Now several OSDs do not come up any more.
>> Typical error message:
>> /build/ceph-14.2.8/src/os/bluestore/BlueFS.cc: 2261: FAILED
>> ceph_assert(h->file->fnode.ino != 1)
> The context of that line is "we should never run out of log space here":
>
> // previously allocated extents.
> bool must_dirty = false;
> if (allocated < offset + length) {
> // we should never run out of log space here; see the min runway check
> // in _flush_and_sync_log.
> ceph_assert(h->file->fnode.ino != 1);
>
> So I guess we are violating that "should", and the Bluestore code
> doesn't handle that case. And the "min runway" check may not be
> reliable. Should we file a bug?
>
> Again, help on how to proceed would be greatly appreciated...