Hi Reed, Lenz, John
I've just tried disabling the balancer, so far ceph-mgr is keeping it's
CPU mostly under 20%, even with both the iostat and dashboard back on.
# ceph balancer off
was
[root@ceph-s1 backup]# ceph balancer status
{
"active": true,
"plans": [],
"mode": "upmap"
}
now
[root@ceph-s1 backup]# ceph balancer status
{
"active": false,
"plans": [],
"mode": "upmap"
}
We are using 8:2 erasure encoding across 324 12TB OSD, plus 4 NVMe OSD
for a replicated cephfs metadata pool.
let me know if the balancer is your problem too...
best,
Jake
On 8/27/19 3:57 PM, Jake Grimmett wrote:
> Yes, the problem still occurs with the dashboard disabled...
>
> Possibly relevant, when both the dashboard and iostat plugins are
> disabled, I occasionally see ceph-mgr rise to 100% CPU.
>
> as suggested by John Hearns, the output of gstack ceph-mgr when at 100%
> is here:
>
> http://p.ip.fi/52sV
>
> many thanks
>
> Jake
>
> On 8/27/19 3:09 PM, Reed Dier wrote:
>> I'm currently seeing this with the dashboard disabled.
>>
>> My instability decreases, but isn't wholly cured, by disabling
>> prometheus and rbd_support, which I use in tandem, as the only thing I'm
>> using the prom-exporter for is the per-rbd metrics.
>>
>>> ceph mgr module ls
>>> {
>>> "enabled_modules": [
>>> "diskprediction_local",
>>> "influx",
>>> "iostat",
>>> "prometheus",
>>> "rbd_support",
>>> "restful",
>>> "telemetry"
>>> ],
>>
>> I'm on Ubuntu 18.04, so that doesn't corroborate with some possible OS
>> correlation.
>>
>> Thanks,
>>
>> Reed
>>
>>> On Aug 27, 2019, at 8:37 AM, Lenz Grimmer <[email protected]
>>> <mailto:[email protected]>> wrote:
>>>
>>> Hi Jake,
>>>
>>> On 8/27/19 3:22 PM, Jake Grimmett wrote:
>>>
>>>> That exactly matches what I'm seeing:
>>>>
>>>> when iostat is working OK, I see ~5% CPU use by ceph-mgr
>>>> and when iostat freezes, ceph-mgr CPU increases to 100%
>>>
>>> Does this also occur if the dashboard module is disabled? Just wondering
>>> if this is isolatable to the iostat module. Thanks!
>>>
>>> Lenz
>>>
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>
>
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