[Gluster-users] high (sys) cpu util and high load

[Ingard Mevåg]

2017-09-05 19:58 GMT+02:00 Vijay Bellur <vbellur at redhat.com>:

> On 09/04/2017 10:00 AM, Ingard Mevåg wrote:
>
>> Hi
>>
>> I'm seeing quite high cpu sys utilisation and an increased system load
>> the past few days on my servers. It appears it doesn't start at exactly the
>> same time for the different servers, but I've not (yet) been able to pin
>> the cpu usage to a specific task or entries in the logs.
>>
>> The cluster is running distribute with 8nodes and 4 bricks each version
>> 3.10
>> The nodes have 32 (HT) cores and 64 gigs of ram.
>>
>> Does anyone know what I can attribute this behaviour to? Or how I can
>> figure out what is causing it?
>>
>>
> Looking for logs of servers and clients around the spike interval is a
> good place to start. Operations like self-heal in gluster can cause higher
> resource utilization than normal.
>

I did think that it might be related to self-heal or rebalance or something
similar as it seemingly started at different times for the different
members of the cluster. But I couldn't find anything in the logs that
suggested that some background operation was running. I did notice the call
log saying that a lot of the bricks had Pending tasks. Could it be
connected to that? Or some other resource being starved?
Would gluster volume status show self heal or distribute running?


>
> HTH,
> Vijay
>
>
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