> If a CephFS client receive a cap release request and it is able to
> perform it (no processes accessing the file at the moment), the client
> cleaned up its internal state and allows the MDS to release the cap.
> This cleanup also involves removing file data from the page cache.
>
> If your MDS
Hi,
On 03.11.18 10:31, jes...@krogh.cc wrote:
I suspect that mds asked client to trim its cache. Please run
following commands on an idle client.
In the mean time - we migrated to the RH Ceph version and deliered the MDS
both SSD's and more memory and the problem went away.
It still puzzles
> I suspect that mds asked client to trim its cache. Please run
> following commands on an idle client.
In the mean time - we migrated to the RH Ceph version and deliered the MDS
both SSD's and more memory and the problem went away.
It still puzzles my mind a bit - why is there a connection
On Mon, Oct 15, 2018 at 9:54 PM Dietmar Rieder
wrote:
>
> On 10/15/18 1:17 PM, jes...@krogh.cc wrote:
> >> On 10/15/18 12:41 PM, Dietmar Rieder wrote:
> >>> No big difference here.
> >>> all CentOS 7.5 official kernel 3.10.0-862.11.6.el7.x86_64
> >>
> >> ...forgot to mention: all is luminous
On 10/15/18 1:17 PM, jes...@krogh.cc wrote:
>> On 10/15/18 12:41 PM, Dietmar Rieder wrote:
>>> No big difference here.
>>> all CentOS 7.5 official kernel 3.10.0-862.11.6.el7.x86_64
>>
>> ...forgot to mention: all is luminous ceph-12.2.7
>
> Thanks for your time in testing, this is very valueable
> On 10/15/18 12:41 PM, Dietmar Rieder wrote:
>> No big difference here.
>> all CentOS 7.5 official kernel 3.10.0-862.11.6.el7.x86_64
>
> ...forgot to mention: all is luminous ceph-12.2.7
Thanks for your time in testing, this is very valueable to me in the
debugging. 2 questions:
Did you "sleep
On 10/15/18 12:41 PM, Dietmar Rieder wrote:
> On 10/15/18 12:02 PM, jes...@krogh.cc wrote:
On Sun, Oct 14, 2018 at 8:21 PM wrote:
how many cephfs mounts that access the file? Is is possible that some
program opens that file in RW mode (even they just read the file)?
>>>
>>>
>>> The
On 10/15/18 12:02 PM, jes...@krogh.cc wrote:
>>> On Sun, Oct 14, 2018 at 8:21 PM wrote:
>>> how many cephfs mounts that access the file? Is is possible that some
>>> program opens that file in RW mode (even they just read the file)?
>>
>>
>> The nature of the program is that it is "prepped" by
>> On Sun, Oct 14, 2018 at 8:21 PM wrote:
>> how many cephfs mounts that access the file? Is is possible that some
>> program opens that file in RW mode (even they just read the file)?
>
>
> The nature of the program is that it is "prepped" by one-set of commands
> and queried by another, thus
> On Sun, Oct 14, 2018 at 8:21 PM wrote:
> how many cephfs mounts that access the file? Is is possible that some
> program opens that file in RW mode (even they just read the file)?
The nature of the program is that it is "prepped" by one-set of commands
and queried by another, thus the RW case
On Sun, Oct 14, 2018 at 8:21 PM wrote:
>
> Hi
>
> We have a dataset of ~300 GB on CephFS which as being used for computations
> over and over agian .. being refreshed daily or similar.
>
> When hosting it on NFS after refresh, they are transferred, but from
> there - they would be sitting in the
> Actual amount of memory used by VFS cache is available through 'grep
> Cached /proc/meminfo'. slabtop provides information about cache
> of inodes, dentries, and IO memory buffers (buffer_head).
Thanks, that was also what I got out of it. And why I reported "free"
output in the first as it also
Actual amount of memory used by VFS cache is available through 'grep Cached
/proc/meminfo'. slabtop provides information about cache of inodes, dentries,
and IO memory buffers (buffer_head).
> On 14.10.2018, at 17:28, jes...@krogh.cc wrote:
>
>> Try looking in /proc/slabinfo / slabtop during
> Try looking in /proc/slabinfo / slabtop during your tests.
I need a bit of guidance here.. Does the slabinfo cover the VFS page
cache ? .. I cannot seem to find any traces (sorting by size on
machines with a huge cache does not really give anything). Perhaps
I'm holding the screwdriver wrong?
Try looking in /proc/slabinfo / slabtop during your tests.
> On 14.10.2018, at 15:21, jes...@krogh.cc wrote:
>
> Hi
>
> We have a dataset of ~300 GB on CephFS which as being used for computations
> over and over agian .. being refreshed daily or similar.
>
> When hosting it on NFS after
On 14 Oct 2018, at 15.26, John Hearns wrote:
>
> This is a general question for the ceph list.
> Should Jesper be looking at these vm tunables?
> vm.dirty_ratio
> vm.dirty_centisecs
>
> What effect do they have when using Cephfs?
This situation is a read only, thus no dirty data in page cache.
This is a general question for the ceph list.
Should Jesper be looking at these vm tunables?
vm.dirty_ratio
vm.dirty_centisecs
What effect do they have when using Cephfs?
On Sun, 14 Oct 2018 at 14:24, John Hearns wrote:
> Hej Jesper.
> Sorry I do not have a direct answer to your question.
>
Hej Jesper.
Sorry I do not have a direct answer to your question.
When looking at memory usage, I often use this command:
watch cat /rpoc/meminfo
On Sun, 14 Oct 2018 at 13:22, wrote:
> Hi
>
> We have a dataset of ~300 GB on CephFS which as being used for computations
> over and over agian
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