Hi Wesley,
You can also just run:
$ ceph fs get MyFS|grep flags
flags 32 joinable allow_snaps allow_multimds_snaps allow_standby_replay
And if you can see "allow_standby_replay" flag as above that means it's
enabled, or disabled already.
- Xiubo
On 21/10/2022 05:58, Wesley Dillingham wrote:
Thanks Dhairya, what version are you using? I am 16.2.10
[root@alma3-4 ~]# ceph fs dump | grep -i replay
dumped fsmap epoch 90
[mds.alma3-6{0:10340349} state up:standby-replay seq 1 addr [v2:
10.0.24.6:6803/937383171,v1:10.0.24.6:6818/937383171] compat
{c=[1],r=[1],i=[7ff]}]
as you can see i have a MDS in replay mode and standby replay is enabled
but my output is different from yours.
Respectfully,
*Wes Dillingham*
wes@xxxxxxxxxxxxxxxxx
LinkedIn <http://www.linkedin.com/in/wesleydillingham>
On Thu, Oct 20, 2022 at 2:43 PM Dhairya Parmar <dparmar@xxxxxxxxxx> wrote:
Hi Wesley,
You can find if the `allow_standby_replay` is turned on or off by looking
at the fs dump,
run `ceph fs dump | grep allow_standby_replay` and if it is turned on you
will find something like:
$ ./bin/ceph fs dump | grep allow_standby_replay
*** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
2022-10-21T00:06:14.656+0530 7fbed4fc3640 -1 WARNING: all dangerous and
experimental features are enabled.
2022-10-21T00:06:14.663+0530 7fbed4fc3640 -1 WARNING: all dangerous and
experimental features are enabled.
dumped fsmap epoch 8
flags 32 joinable allow_snaps allow_multimds_snaps *allow_standby_replay*
turn it to false and it will be gone:
$ ./bin/ceph fs set a allow_standby_replay false
*** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
2022-10-21T00:10:38.668+0530 7f68b66f0640 -1 WARNING: all dangerous and
experimental features are enabled.
2022-10-21T00:10:38.675+0530 7f68b66f0640 -1 WARNING: all dangerous and
experimental features are enabled.
$ ./bin/ceph fs dump | grep allow_standby_replay
*** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
2022-10-21T00:10:43.938+0530 7fe6b3e7a640 -1 WARNING: all dangerous and
experimental features are enabled.
2022-10-21T00:10:43.945+0530 7fe6b3e7a640 -1 WARNING: all dangerous and
experimental features are enabled.
dumped fsmap epoch 15
Hope it helps.
On Thu, Oct 20, 2022 at 11:09 PM Wesley Dillingham <wes@xxxxxxxxxxxxxxxxx>
wrote:
I am building some automation for version upgrades of MDS and part of the
process I would like to determine if a filesystem has allow_standby_replay
set to true and if so then disable it. Granted I could just issue: "ceph
fs
set MyFS allow_standby_replay false" and be done with it but Its got me
curious that there is not the equivalent command: "ceph fs get MyFS
allow_standby_replay" to check this information. So where can an operator
determine this?
I tried a diff of "ceph fs get MyFS" with this configurable in both true
and false and found:
diff /tmp/true /tmp/false
3,4c3,4
< epoch 66
< flags 32
---
epoch 67
flags 12
and Im guessing this information is encoded in the "flags" field. I am
working with 16.2.10. Thanks.
Respectfully,
*Wes Dillingham*
wes@xxxxxxxxxxxxxxxxx
LinkedIn <http://www.linkedin.com/in/wesleydillingham>
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--
*Dhairya Parmar*
He/Him/His
Associate Software Engineer, CephFS
Red Hat Inc. <https://www.redhat.com/>
dparmar@xxxxxxxxxx
<https://www.redhat.com/>
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