Hi Vladimir,
This issue looks like the one I am working on now in [1], which is also
a infinitely stuck bug when creating a new file and then writes
something to it.
The issue [1] was caused by setting the max_mds > 1 and enabling the
inline_data and then create a file and then write to it. It seems a
deadlock in MDS vs kernel.
BTW, what's your setup for:
a), max_mds > 1 ?
b), inline_data enabled ?
c), how to reproduce it, could you provide the detail steps ?
d), could you enable the kernel debug log and set the debug_mds to 25 in
MDSes and share the logs ?
[1] https://tracker.ceph.com/issues/55377
Thanks
BRs
-- Xiubo
On 4/25/22 5:25 AM, Vladimir Brik wrote:
Hello
We are experiencing an issue where, sometimes, when users write to
cephfs an empty file is created and then the application hangs,
seemingly indefinitely. I am sometimes able to reproduce with dd.
Does anybody know what might be going on?
Some details:
- ceph health complains about 100+ slow metadata IOs
- CPU utilization of ceph-mds is low
- We have almost 200 kernel cephfs clients
- Cephfs metadata is stored on 3 OSDs that use NVMe flash AICs
Vlad
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