On Thu, Dec 21, 2017 at 7:33 PM, Webert de Souza Lima
<webert.boss@xxxxxxxxx> wrote:
> I have upgraded the kernel on a client node (one that has close-to-zero
> traffic) used for tests.
>
> {
> "reconnecting" : false,
> "id" : 1620266,
> "num_leases" : 0,
> "inst" : "client.1620266 10.0.0.111:0/3921220890",
> "state" : "open",
> "completed_requests" : 0,
> "num_caps" : 1402490,
> "client_metadata" : {
> "kernel_version" : "4.4.0-104-generic",
> "hostname" : "suppressed",
> "entity_id" : "admin"
> },
> "replay_requests" : 0
> },
>
> still 1.4M caps used.
>
> is upgrading the client kernel enough ?
>
See http://tracker.ceph.com/issues/22446. We haven't implemented that
feature. "echo 3 >/proc/sys/vm/drop_caches" should drop most caps.
>
>
> Regards,
>
> Webert Lima
> DevOps Engineer at MAV Tecnologia
> Belo Horizonte - Brasil
> IRC NICK - WebertRLZ
>
> On Fri, Dec 15, 2017 at 11:16 AM, Webert de Souza Lima
> <webert.boss@xxxxxxxxx> wrote:
>>
>> So,
>>
>> On Fri, Dec 15, 2017 at 10:58 AM, Yan, Zheng <ukernel@xxxxxxxxx> wrote:
>>>
>>>
>>> 300k are ready quite a lot. opening them requires long time. does you
>>> mail server really open so many files?
>>
>>
>> Yes, probably. It's a commercial solution. A few thousand domains, dozens
>> of thousands of users and god knows how any mailboxes.
>> From the daemonperf you can see the write workload is high, so yes, too
>> much files opening (dovecot mdbox stores multiple e-mails per file, split
>> into many files).
>>
>>> I checked 4.4 kernel, it includes the code that trim cache when mds
>>> recovers.
>>
>>
>> Ok, all nodes are running 4.4.0-75-generic. The fix might have been
>> included in a newer version.
>> I'll upgrade it asap.
>>
>>
>> Regards,
>>
>> Webert Lima
>> DevOps Engineer at MAV Tecnologia
>> Belo Horizonte - Brasil
>> IRC NICK - WebertRLZ
>
>
>
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