thanks. That's the behavior I was hoping for.
From: Gregory Farnum
Sent: Thursday, December 8, 2022 12:57 PM
To: Charles Hedrick
Cc: Manuel Holtgrewe ; Dhairya Parmar
; ceph-users@ceph.io
Subject: Re: [ceph-users] Re: what happens if a server crashes with
Ceph clients keep updates buffered until they receive server
notification that the update is persisted to disk. On server crash,
the client connects to either the newly-responsible OSD (for file
data) or the standby/restarted MDS (for file metadata) and replays
outstanding operations. This is all
I'm aware that the file system will remain available. My concern is about long
jobs using it failing because a single operation returns an error. While none
of the discussion so far has been explicit, I assume this can happen if an OSD
fails, since it might have done an async acknowledgement
Hi Charles,
are you concerned with a single Ceph cluster server crash or the whole
server crashing? If you have sufficient redundancy, nothing bad should
happen but the file system should remain available. The same should be true
if you perform an upgrade in the "correct" way, e.g., through the
network and local file systems have different requirements. If I have a long
job and the machine I'm running on crashes, I have to rerun it. The fact that
the last 500 msec of data didn't get flushed to disk is unlikely to matter.
If I have a long job using a network file system, and the server
This page is a nice summary:
https://brooker.co.za/blog/2014/07/04/iostat-pct.html
> On Dec 8, 2022, at 11:05 AM, Sven Kieske wrote:
>
> On Mi, 2022-12-07 at 14:25 -0500, Anthony D'Atri wrote:
>> Especially on SSDs.
>>
>>> On Dec 7, 2022, at 14:16, Matthias Ferdinand wrote:
>>>
>>> The
On Thu, Dec 8, 2022 at 8:42 AM Manuel Holtgrewe wrote:
>
> Hi Charles,
>
> as far as I know, CephFS implements POSIX semantics. That is, if the CephFS
> server cluster dies for whatever reason then this will translate in I/O
> errors. This is the same as if your NFS server dies or you run the
Hi Charles,
as far as I know, CephFS implements POSIX semantics. That is, if the CephFS
server cluster dies for whatever reason then this will translate in I/O
errors. This is the same as if your NFS server dies or you run the program
locally on a workstation/laptop and the machine loses power.
thanks. I'm evaluating cephfs for a computer science dept. We have users that
run week-long AI training jobs. They use standard packages, which they probably
don't want to modify. At the moment we use NFS. It uses synchronous I/O, so if
somethings goes wrong, the users' jobs pause until we
On Mi, 2022-12-07 at 14:25 -0500, Anthony D'Atri wrote:
> Especially on SSDs.
>
> > On Dec 7, 2022, at 14:16, Matthias Ferdinand wrote:
> >
> > The usefulness of %util is limited anyway.
Interesting,
this is the first time I read such claims about limited usefulness of %util.
Can you back
Hi,
When I want to enable this module it is missing:
https://docs.ceph.com/en/quincy/mgr/rgw.html
Looked in the mgr module list but nothing there.
What is the reason?
Istvan Szabo
Senior Infrastructure Engineer
---
Agoda Services Co., Ltd.
e:
Hello,
in case anyone finds this post while trying to find an answer to the
same question, I believe the answer is here:
https://lists.ceph.io/hyperkitty/list/ceph-users@ceph.io/message/DBJRYTMQURANFFWSS4QDCKD5KULJQ46X/
As far as I understand it:
Creating a snapshot requires to acquire the
Hi,
Running a simple
`echo 1>a;sync;rm a;sync;fstrim --all`
Triggers the problem. No need to have the mount point mounted with discard.
On Thu, Dec 8, 2022 at 12:33 AM Josef Johansson wrote:
>
> Hi,
>
> I've updated https://tracker.ceph.com/issues/57396 with some more
> info, it seems that
Hi all,
I'm on a evaluation stage and implementing a fully virtualized ceph
quincy test cluster.
I successfully deployed the first two mon and three osd; on the first
mon I also deployed the manager and the dashboard. All the deployments
was carried out without any automation (ansible or
Hi,
if you value your data you shouldn't set it to k (in your case 6). The
docs [1] are pretty clear about that:
min_size
Sets the minimum number of replicas required for I/O. See Set the
Number of Object Replicas for further details. In the case of
Erasure Coded pools this should
Hi,
do the MONs use the same SAS interface? They store the mon db on local
disk, so it might be related. But without any logs or more details
it's just guessing.
Regards,
Eugen
Zitat von Mevludin Blazevic :
Hi all,
I'm running Pacific with cephadm.
After installation, ceph
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