sø Campus
Bygning 109, rum S14
From: Dietmar Rieder
Sent: 20 January 2021 14:18:19
To: Frank Schilder; ceph-users@ceph.io
Subject: Re: [ceph-users] Re: cephfs: massive drop in MDS requests per second
with increasing number of caps
Hi Frank,
yes I ran several tests going down from the
===
> Frank Schilder
> AIT Risø Campus
> Bygning 109, rum S14
>
>
> From: Dietmar Rieder
> Sent: 18 January 2021 21:01:50
> To: ceph-users@ceph.io
> Subject: [ceph-users] Re: cephfs: massive drop in MDS requests per second
> with increasin
: Dietmar Rieder
Sent: 19 January 2021 13:24:15
To: Frank Schilder; ceph-users@ceph.io
Subject: Re: [ceph-users] Re: cephfs: massive drop in MDS requests per second
with increasing number of caps
Hi Frank,
you don't need to remount the fs. The kernel driver should react to the
change on th
From: Dietmar Rieder
Sent: 18 January 2021 21:01:50
To: ceph-users@ceph.io
Subject: [ceph-users] Re: cephfs: massive drop in MDS requests per second with
increasing number of caps
Hi Burkhard, hi list,
I checked the 'mds_max_caps_per_client' setting and it turned out that
i
rmance impact.
Best regards,
=
Frank Schilder
AIT Risø Campus
Bygning 109, rum S14
From: Dietmar Rieder
Sent: 18 January 2021 21:01:50
To: ceph-users@ceph.io
Subject: [ceph-users] Re: cephfs: massive drop in MDS requests per second with
incre
Hi Burkhard, hi list,
I checked the 'mds_max_caps_per_client' setting and it turned out that
it was set to the default value of 1 million. The
'mds_cache_memory_limit' setting, however I had previously set to 40GB.
Given this, I now started to play around with the max_caps and set
'mds_max
Hi Burkhard,
thanks so much for the quick reply and the explanation and suggestions.
I'll check these settings and eventually change them and report back.
Best
Dietmar
On 1/18/21 6:00 PM, Burkhard Linke wrote:
Hi,
On 1/18/21 5:46 PM, Dietmar Rieder wrote:
Hi all,
we noticed a massive drop
Hi,
On 1/18/21 5:46 PM, Dietmar Rieder wrote:
Hi all,
we noticed a massive drop in requests per second a cephfs client is
able to perform when we do a recursive chown over a directory with
millions of files. As soon as we see about 170k caps on the MDS, the
client performance drops from abou
