Hi Igor
We'll take a look at disabling swap on the nodes and see if that
improves the situation.
Having checked across all osds we're not seeing
bluestore_reads_with_retries as anything other than a zero value.
We get the error anywhere from 3 - 10 occurrences of the error a
week, but it's usually only one or two PGs that are inconsistent
at any one time.
Thanks
Welby
On Mon, Sep 14, 2020 at 12:17 PM Igor Fedotov <ifedotov@xxxxxxx
<mailto:ifedotov@xxxxxxx>> wrote:
Hi David,
you might want to try to disable swap for your nodes. Look
like there is
some implicit correlation between such read errors and
enabled swapping.
Also wondering whether you can observe non-zero values for
"bluestore_reads_with_retries" performance counters over your
OSDs. How
wide-spread these cases are present? How high this counter
might get?
Thanks,
Igor
On 9/9/2020 4:59 PM, David Orman wrote:
> Right, you can see the previously referenced ticket/bug in
the link I had
> provided. It's definitely not an unknown situation.
>
> We have another one today:
>
> debug 2020-09-09T06:49:36.595+0000 7f570871d700 -1
> bluestore(/var/lib/ceph/osd/ceph-123) _verify_csum bad
crc32c/0x1000
> checksum at blob offset 0x60000, got 0x6706be76, expected
0x929a618, device
> location [0x2f387d70000~1000], logical extent 0xe0000~1000,
object
> 0#2:7ff493bc:::rbd_data.3.20d195d612942.0000000004228a96:head#
>
> debug 2020-09-09T06:49:36.611+0000 7f570871d700 -1
> bluestore(/var/lib/ceph/osd/ceph-123) _verify_csum bad
crc32c/0x1000
> checksum at blob offset 0x60000, got 0x6706be76, expected
0x929a618, device
> location [0x2f387d70000~1000], logical extent 0xe0000~1000,
object
> 0#2:7ff493bc:::rbd_data.3.20d195d612942.0000000004228a96:head#
>
> debug 2020-09-09T06:49:36.611+0000 7f570871d700 -1
> bluestore(/var/lib/ceph/osd/ceph-123) _verify_csum bad
crc32c/0x1000
> checksum at blob offset 0x60000, got 0x6706be76, expected
0x929a618, device
> location [0x2f387d70000~1000], logical extent 0xe0000~1000,
object
> 0#2:7ff493bc:::rbd_data.3.20d195d612942.0000000004228a96:head#
>
> debug 2020-09-09T06:49:36.611+0000 7f570871d700 -1
> bluestore(/var/lib/ceph/osd/ceph-123) _verify_csum bad
crc32c/0x1000
> checksum at blob offset 0x60000, got 0x6706be76, expected
0x929a618, device
> location [0x2f387d70000~1000], logical extent 0xe0000~1000,
object
> 0#2:7ff493bc:::rbd_data.3.20d195d612942.0000000004228a96:head#
>
> debug 2020-09-09T06:49:37.315+0000 7f570871d700 -1
log_channel(cluster) log
> [ERR] : 2.3fe shard 123(0) soid
> 2:7ff493bc:::rbd_data.3.20d195d612942.0000000004228a96:head
: candidate had
> a read error
>
> debug 2020-09-09T06:57:08.930+0000 7f570871d700 -1
log_channel(cluster) log
> [ERR] : 2.3fes0 deep-scrub 0 missing, 1 inconsistent objects
>
> debug 2020-09-09T06:57:08.930+0000 7f570871d700 -1
log_channel(cluster) log
> [ERR] : 2.3fe deep-scrub 1 errors
>
> This happens across the entire cluster, not just one
server, so we don't
> think it's faulty hardware.
>
> On Wed, Sep 9, 2020 at 12:51 AM Janne Johansson
<icepic.dz@xxxxxxxxx <mailto:icepic.dz@xxxxxxxxx>> wrote:
>
>> I googled "got 0x6706be76, expected" and found some hits
regarding ceph,
>> so whatever it is, you are not the first, and that number
has some internal
>> meaning.
>> Redhat solution for similar issue says that checksum is
for seeing all
>> zeroes, and hints at a bad write cache on the controller
or something that
>> ends up clearing data instead of writing the correct
information on
>> shutdowns.
>>
>>
>> Den tis 8 sep. 2020 kl 23:21 skrev David Orman
<ormandj@xxxxxxxxxxxx <mailto:ormandj@xxxxxxxxxxxx>>:
>>
>>>
>>> We're seeing repeated inconsistent PG warnings, generally
on the order of
>>> 3-10 per week.
>>>
>>> pg 2.b9 is active+clean+inconsistent, acting
[25,117,128,95,151,15]
>>>
>>>
>>
>>> Every time we look at them, we see the same checksum
(0x6706be76):
>>>
>>> debug 2020-08-13T18:39:01.731+0000 7fbc037a7700 -1
>>> bluestore(/var/lib/ceph/osd/ceph-25) _verify_csum bad
crc32c/0x1000
>>> checksum at blob offset 0x0, got 0x6706be76, expected
0x61f2021c, device
>>> location [0x12b403c0000~1000], logical extent 0x0~1000,
object
>>>
2#2:0f1a338f:::rbd_data.3.20d195d612942.0000000001db869b:head#
>>>
>>> This looks a lot like: https://tracker.ceph.com/issues/22464
>>> That said, we've got the following versions in play
(cluster was created
>>> with 15.2.3):
>>> ceph version 15.2.4
(7447c15c6ff58d7fce91843b705a268a1917325c) octopus
>>> (stable)
>>>
>>
>> --
>> May the most significant bit of your life be positive.
>>
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