Hi Adam. Just tried to extend the hosts memory to 48gb, and it stopped
throwing the error, and set it to 3.something gb instead
Thank you so much for you time and explainations
On Tue, Apr 9, 2024 at 9:30 PM Adam King <adking@xxxxxxxxxx> wrote:
> The same experiment with the mds daemons pulling 4GB instead of the 16GB,
> and me fixing the starting total memory (I accidentally used the
> memory_available_kb instead of memory_total_kb the first time) gives us
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> *DEBUG cephadm.autotune:autotune.py:35 Autotuning OSD memory with given
> parameters:Total memory: 23530995712Daemons: [<DaemonDescription>(crash.a),
> <DaemonDescription>(grafana.a), <DaemonDescription>(mds.a),
> <DaemonDescription>(mds.b), <DaemonDescription>(mds.c),
> <DaemonDescription>(mgr.a), <DaemonDescription>(mon.a),
> <DaemonDescription>(node-exporter.a), <DaemonDescription>(osd.1),
> <DaemonDescription>(osd.2), <DaemonDescription>(osd.3),
> <DaemonDescription>(osd.4), <DaemonDescription>(prometheus.a)]DEBUG
> cephadm.autotune:autotune.py:50 Subtracting 134217728 from total for crash
> daemonDEBUG cephadm.autotune:autotune.py:52 new total: 23396777984DEBUG
> cephadm.autotune:autotune.py:50 Subtracting 1073741824 from total for
> grafana daemonDEBUG cephadm.autotune:autotune.py:52 new total:
> 22323036160DEBUG cephadm.autotune:autotune.py:40 Subtracting 4294967296
> from total for mds daemonDEBUG cephadm.autotune:autotune.py:42 new
> total: 18028068864DEBUG cephadm.autotune:autotune.py:40 Subtracting
> 4294967296 from total for mds daemonDEBUG
> cephadm.autotune:autotune.py:42 new total: 13733101568DEBUG
> cephadm.autotune:autotune.py:40 Subtracting 4294967296 from total for mds
> daemonDEBUG cephadm.autotune:autotune.py:42 new total: 9438134272DEBUG
> cephadm.autotune:autotune.py:50 Subtracting 4294967296 from total for mgr
> daemonDEBUG cephadm.autotune:autotune.py:52 new total: 5143166976DEBUG
> cephadm.autotune:autotune.py:50 Subtracting 1073741824 from total for mon
> daemonDEBUG cephadm.autotune:autotune.py:52 new total: 4069425152DEBUG
> cephadm.autotune:autotune.py:50 Subtracting 1073741824 from total for
> node-exporter daemonDEBUG cephadm.autotune:autotune.py:52 new total:
> 2995683328DEBUG cephadm.autotune:autotune.py:50 Subtracting 1073741824
> from total for prometheus daemonDEBUG cephadm.autotune:autotune.py:52
> new total: 1921941504DEBUG cephadm.autotune:autotune.py:66 Final total
> is 1921941504 to be split among 4 OSDsDEBUG
> cephadm.autotune:autotune.py:68 Result is 480485376 per OSD*
>
> My understanding is, given starting memory_total_kb of *32827840*, we get
> *33615708160* total bytes. We multiply that by the 0.7 autotune ratio to
> get *23530995712 *bytes to be split among the daemons (something like
> 23-24 GB). Then the mgr and mds daemons all get 4GB, the mon,
> node-exporter, and prometheus all take 1GB, and the crash daemon gets
> 128KB. That leaves us with only 2GB to split among the 4 OSDs. That's how
> we arrive at that "480485376" number per OSD from the original error
> message you posted.
>
> Unable to set osd_memory_target on my-ceph01 to 480485376: error parsing
>> value: Value '480485376' is below minimum 939524096
>
>
> As that value is well below the minimum (it's only about half a GB), it
> reports that error when trying to set it.
>
> On Tue, Apr 9, 2024 at 12:58 PM Mads Aasted <mads2a@xxxxxxxxx> wrote:
>
>> Hi Adam
>>
>> Seems like the mds_cache_memory_limit both set globally through cephadm
>> and the hosts mds daemons are all set to approx. 4gb
>> root@my-ceph01:/# ceph config get mds mds_cache_memory_limit
>> 4294967296
>> same if query the individual mds daemons running on my-ceph01, or any of
>> the other mds daemons on the other hosts.
>>
>> On Tue, Apr 9, 2024 at 6:14 PM Mads Aasted <mads2a@xxxxxxxxx> wrote:
>>
>>> Hi Adam
>>>
>>> Let me just finish tucking in a devlish tyke here and i’ll get to it
>>> first thing
>>>
>>> tirs. 9. apr. 2024 kl. 18.09 skrev Adam King <adking@xxxxxxxxxx>:
>>>
>>>> I did end up writing a unit test to see what we calculated here, as
>>>> well as adding a bunch of debug logging (haven't created a PR yet, but
>>>> probably will). The total memory was set to (19858056 * 1024 * 0.7) (total
>>>> memory in bytes * the autotune target ratio) = 14234254540. What ended up
>>>> getting logged was (ignore the daemon id for the daemons, they don't affect
>>>> anything. Only the types matter)
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>>>> *DEBUG cephadm.autotune:autotune.py:35 Autotuning OSD memory with
>>>> given parameters:Total memory: 14234254540Daemons:
>>>> [<DaemonDescription>(crash.a), <DaemonDescription>(grafana.a),
>>>> <DaemonDescription>(mds.a), <DaemonDescription>(mds.b),
>>>> <DaemonDescription>(mds.c), <DaemonDescription>(mgr.a),
>>>> <DaemonDescription>(mon.a), <DaemonDescription>(node-exporter.a),
>>>> <DaemonDescription>(osd.1), <DaemonDescription>(osd.2),
>>>> <DaemonDescription>(osd.3), <DaemonDescription>(osd.4),
>>>> <DaemonDescription>(prometheus.a)]DEBUG cephadm.autotune:autotune.py:50
>>>> Subtracting 134217728 from total for crash daemonDEBUG
>>>> cephadm.autotune:autotune.py:52 new total: 14100036812DEBUG
>>>> cephadm.autotune:autotune.py:50 Subtracting 1073741824 from total for
>>>> grafana daemonDEBUG cephadm.autotune:autotune.py:52 new total:
>>>> 13026294988DEBUG cephadm.autotune:autotune.py:40 Subtracting 17179869184
>>>> from total for mds daemonDEBUG cephadm.autotune:autotune.py:42 new
>>>> total: -4153574196DEBUG cephadm.autotune:autotune.py:40 Subtracting
>>>> 17179869184 from total for mds daemonDEBUG
>>>> cephadm.autotune:autotune.py:42 new total: -21333443380DEBUG
>>>> cephadm.autotune:autotune.py:40 Subtracting 17179869184 from total for mds
>>>> daemonDEBUG cephadm.autotune:autotune.py:42 new total: -38513312564DEBUG
>>>> cephadm.autotune:autotune.py:50 Subtracting 4294967296 from total for
>>>> mgr daemonDEBUG cephadm.autotune:autotune.py:52 new total:
>>>> -42808279860DEBUG cephadm.autotune:autotune.py:50 Subtracting 1073741824
>>>> from total for mon daemonDEBUG cephadm.autotune:autotune.py:52 new
>>>> total: -43882021684DEBUG cephadm.autotune:autotune.py:50 Subtracting
>>>> 1073741824 from total for node-exporter daemonDEBUG
>>>> cephadm.autotune:autotune.py:52 new total: -44955763508DEBUG
>>>> cephadm.autotune:autotune.py:50 Subtracting 1073741824 from total for
>>>> prometheus daemonDEBUG cephadm.autotune:autotune.py:52 new total:
>>>> -46029505332*
>>>>
>>>> It looks like it was taking pretty much all the memory away for the mds
>>>> daemons. The amount, however, is taken from the "mds_cache_memory_limit"
>>>> setting for each mds daemon. The number it was defaulting to for the test
>>>> is quite large. I guess I'd need to know what that comes out to for the mds
>>>> daemons in your cluster to get a full picture. Also, you can see the total
>>>> go well into the negatives here. When that happens cephadm just tries to
>>>> remove the osd_memory_target config settings for the OSDs on the host, but
>>>> given the error message from your initial post, it must be getting some
>>>> positive value when actually running on your system.
>>>>
>>>> On Fri, Apr 5, 2024 at 2:21 AM Mads Aasted <mads2a@xxxxxxxxx> wrote:
>>>>
>>>>> Hi Adam
>>>>> No problem, i really appreciate your input :)
>>>>> The memory stats returned are as follows
>>>>> "memory_available_kb": 19858056,
>>>>> "memory_free_kb": 277480,
>>>>> "memory_total_kb": 32827840,
>>>>>
>>>>> On Thu, Apr 4, 2024 at 10:14 PM Adam King <adking@xxxxxxxxxx> wrote:
>>>>>
>>>>>> Sorry to keep asking for more info, but can I also get what `cephadm
>>>>>> gather-facts` on that host returns for "memory_total_kb". Might end up
>>>>>> creating a unit test out of this case if we have a calculation bug here.
>>>>>>
>>>>>> On Thu, Apr 4, 2024 at 4:05 PM Mads Aasted <mads2a@xxxxxxxxx> wrote:
>>>>>>
>>>>>>> sorry for the double send, forgot to hit reply all so it would
>>>>>>> appear on the page
>>>>>>>
>>>>>>> Hi Adam
>>>>>>>
>>>>>>> If we multiply by 0.7, and work through the previous example from
>>>>>>> that number, we would still arrive at roughly 2.5 gb for each osd. And the
>>>>>>> host in question is trying to set it to less than 500mb.
>>>>>>> I have attached a list of the processes running on the host.
>>>>>>> Currently you can even see that the OSD's are taking up the most memory by
>>>>>>> far, and at least 5x its proposed minimum.
>>>>>>> root@my-ceph01:/# ceph orch ps | grep my-ceph01
>>>>>>> crash.my-ceph01 my-ceph01 running (3w)
>>>>>>> 7m ago 13M 9052k - 17.2.6
>>>>>>> grafana.my-ceph01 my-ceph01 *:3000 running (3w)
>>>>>>> 7m ago 13M 95.6M - 8.3.5
>>>>>>> mds.testfs.my-ceph01.xjxfzd my-ceph01 running (3w)
>>>>>>> 7m ago 10M 485M - 17.2.6
>>>>>>> mds.prodfs.my-ceph01.rplvac my-ceph01 running (3w)
>>>>>>> 7m ago 12M 26.9M - 17.2.6
>>>>>>> mds.prodfs.my-ceph01.twikzd my-ceph01 running (3w)
>>>>>>> 7m ago 12M 26.2M - 17.2.6
>>>>>>> mgr.my-ceph01.rxdefe my-ceph01 *:8443,9283 running (3w)
>>>>>>> 7m ago 13M 907M - 17.2.6
>>>>>>> mon.my-ceph01 my-ceph01 running (3w)
>>>>>>> 7m ago 13M 503M 2048M 17.2.6
>>>>>>> node-exporter.my-ceph01 my-ceph01 *:9100 running (3w)
>>>>>>> 7m ago 13M 20.4M - 1.5.0
>>>>>>> osd.3 my-ceph01 running
>>>>>>> (3w) 7m ago 11M 2595M 4096M 17.2.6
>>>>>>> osd.5 my-ceph01 running
>>>>>>> (3w) 7m ago 11M 2494M 4096M 17.2.6
>>>>>>> osd.6 my-ceph01 running
>>>>>>> (3w) 7m ago 11M 2698M 4096M 17.2.6
>>>>>>> osd.9 my-ceph01 running
>>>>>>> (3w) 7m ago 11M 3364M 4096M 17.2.6
>>>>>>> prometheus.my-ceph01 my-ceph01 *:9095 running (3w)
>>>>>>> 7m ago 13M 164M - 2.42.0
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> On Thu, Mar 28, 2024 at 2:13 AM Adam King <adking@xxxxxxxxxx> wrote:
>>>>>>>
>>>>>>>> I missed a step in the calculation. The total_memory_kb I
>>>>>>>> mentioned earlier is also multiplied by the value of the
>>>>>>>> mgr/cephadm/autotune_memory_target_ratio before doing the subtractions for
>>>>>>>> all the daemons. That value defaults to 0.7. That might explain it seeming
>>>>>>>> like it's getting a value lower than expected. Beyond that, I'd think 'i'd
>>>>>>>> need a list of the daemon types and count on that host to try and work
>>>>>>>> through what it's doing.
>>>>>>>>
>>>>>>>> On Wed, Mar 27, 2024 at 10:47 AM Mads Aasted <mads2a@xxxxxxxxx>
>>>>>>>> wrote:
>>>>>>>>
>>>>>>>>> Hi Adam.
>>>>>>>>>
>>>>>>>>> So doing the calculations with what you are stating here I arrive
>>>>>>>>> at a total sum for all the listed processes at 13.3 (roughly) gb, for
>>>>>>>>> everything except the osds, leaving well in excess of +4gb for each OSD.
>>>>>>>>> Besides the mon daemon which i can tell on my host has a limit of
>>>>>>>>> 2gb , none of the other daemons seem to have a limit set according to ceph
>>>>>>>>> orch ps. Then again, they are nowhere near the values stated in
>>>>>>>>> min_size_by_type that you list.
>>>>>>>>> Obviously yes, I could disable the auto tuning, but that would
>>>>>>>>> leave me none the wiser as to why this exact host is trying to do this.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Tue, Mar 26, 2024 at 10:20 PM Adam King <adking@xxxxxxxxxx>
>>>>>>>>> wrote:
>>>>>>>>>
>>>>>>>>>> For context, the value the autotune goes with takes the value
>>>>>>>>>> from `cephadm gather-facts` on the host (the "memory_total_kb" field) and
>>>>>>>>>> then subtracts from that per daemon on the host according to
>>>>>>>>>>
>>>>>>>>>> min_size_by_type = {
>>>>>>>>>> 'mds': 4096 * 1048576,
>>>>>>>>>> 'mgr': 4096 * 1048576,
>>>>>>>>>> 'mon': 1024 * 1048576,
>>>>>>>>>> 'crash': 128 * 1048576,
>>>>>>>>>> 'keepalived': 128 * 1048576,
>>>>>>>>>> 'haproxy': 128 * 1048576,
>>>>>>>>>> 'nvmeof': 4096 * 1048576,
>>>>>>>>>> }
>>>>>>>>>> default_size = 1024 * 1048576
>>>>>>>>>>
>>>>>>>>>> what's left is then divided by the number of OSDs on the host to
>>>>>>>>>> arrive at the value. I'll also add, since it seems to be an issue on this
>>>>>>>>>> particular host, if you add the "_no_autotune_memory" label to the host,
>>>>>>>>>> it will stop trying to do this on that host.
>>>>>>>>>>
>>>>>>>>>> On Mon, Mar 25, 2024 at 6:32 PM <mads2a@xxxxxxxxx> wrote:
>>>>>>>>>>
>>>>>>>>>>> I have a virtual ceph cluster running 17.2.6 with 4 ubuntu 22.04
>>>>>>>>>>> hosts in it, each with 4 OSD's attached. The first 2 servers hosting mgr's
>>>>>>>>>>> have 32GB of RAM each, and the remaining have 24gb
>>>>>>>>>>> For some reason i am unable to identify, the first host in the
>>>>>>>>>>> cluster appears to constantly be trying to set the osd_memory_target
>>>>>>>>>>> variable to roughly half of what the calculated minimum is for the cluster,
>>>>>>>>>>> i see the following spamming the logs constantly
>>>>>>>>>>> Unable to set osd_memory_target on my-ceph01 to 480485376: error
>>>>>>>>>>> parsing value: Value '480485376' is below minimum 939524096
>>>>>>>>>>> Default is set to 4294967296.
>>>>>>>>>>> I did double check and osd_memory_base (805306368) +
>>>>>>>>>>> osd_memory_cache_min (134217728) adds up to minimum exactly
>>>>>>>>>>> osd_memory_target_autotune is currently enabled. But i cannot
>>>>>>>>>>> for the life of me figure out how it is arriving at 480485376 as a value
>>>>>>>>>>> for that particular host that even has the most RAM. Neither the cluster or
>>>>>>>>>>> the host is even approaching max utilization on memory, so it's not like
>>>>>>>>>>> there are processes competing for resources.
>>>>>>>>>>> _______________________________________________
>>>>>>>>>>> ceph-users mailing list -- ceph-users@xxxxxxx
>>>>>>>>>>> To unsubscribe send an email to ceph-users-leave@xxxxxxx
>>>>>>>>>>>
>>>>>>>>>>>
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