Hi *,
I'm curious if this idea [1] of quotas on namespace level for rbd will
be implemented. I couldn't find any existing commands in my lab
Octopus cluster so I guess it's still just an idea, right?
If there's any information I missed please point me to it.
Thanks!
Eugen
[1]
https://trello.com/c/Y1n75zpy/396-rbd-per-pool-per-namespace-provision-quot…
Hi Roman,
Yes, you're right - OSDs list all objects during peering and take the latest full version of each object. Full version is a version that has at least min_size parts for XOR/EC, or any version for replicated setups which is OK because writes are atomic. If there is a newer "committed" ("stabilized") version of the object, but it doesn't have sufficient number of parts, the object is marked as incomplete.
By the way, did you receive my reply that I sent directly to your email? - it could've ended up in spam because yourcmc.ru is my own mail server.
> Hi Vitaliy,
>
> Awesome what you did. I like the minimalistic approach focused on
> performance very much. A long way you've passed implementing the
> whole stack from client to storage.
>
> Could you please describe peering process and object recovery in more
> details? You write in the README that there is no PGLog in your
> storage. After a brief glance into osd_ops.h and blockstore_impl.cpp I
> see there is a 'version' field. I can assume that every object is
> marked with a version and recovery happens taking the whole up-to-date
> object, right?
>
> --
> Roman
>
> On 2020-09-23 00:44, vitalif(a)yourcmc.ru wrote:
>
>> Hi!
>> After almost a year of development in my spare time I present my own
>> software-defined block storage system: Vitastor - https://vitastor.io
>> I designed it similar to Ceph in many ways, it also has Pools, PGs,
>> OSDs, different coding schemes, rebalancing and so on. However it's
>> much simpler and much faster. In a test cluster with SATA SSDs it
>> achieved Q1T1 latency of 0.14ms which is especially great compared to
>> Ceph RBD's 1ms for writes and 0.57ms for reads. In an "iops
>> saturation" parallel load benchmark it reached 895k read / 162k write
>> iops, compared to Ceph's 480k / 100k on the same hardware, but the
>> most interesting part was CPU usage: Ceph OSDs were using 40 CPU cores
>> out of 64 on each node and Vitastor was only using 4.
>> Of course it's an early pre-release which means that, for example, it
>> lacks snapshot support and other useful features. However the base is
>> finished - it works and runs QEMU VMs. I like the design and I plan to
>> develop it further.
>> There are more details in the README file which currently opens from
>> the domain https://vitastor.io
>> Sorry if it was a bit off-topic, I just thought it could be
>> interesting for you :)
Hi,
Is it possible to remove an existing WAL device from an OSD? I saw that
ceph-bluestore-tool has a command bluefs-bdev-migrate, but it's not
clear to me if this can only move a WAL device or if it can be used to
remove it ...
Regards,
Michael
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Hello, I got this error after I tried upgrade from ceph:v15.2.4 to ceph:v15.2.5 with dead osd.6
cluster:
id: 4e01640b-951b-4f75-8dca-0bad4faf1b11
health: HEALTH_ERR
Module 'cephadm' has failed: auth get failed: failed to find osd.6 in keyring retval: -2
In short I added osd.6 on centos, but due network problems osd.6 failed to start, at a time I didint understand why and there was similar looking problem fixed in ceph:v15.2.5. So I tried to upgrade with cephadm, upgrade got stuck with this error, I canceled upgrade.
Now osd.6 is fixed and working, but I still have this error. "ceph auth ls" shows osd.6 like every other osd it is working fine. I tried to upgrade again but this error keeps appearing in ceph -w and upgrade gets stuck again(everything is upgraded to ceph:v15.2.5 anyway)
osd.6 is on separate host which has no other daemons.
Hello,
does anyone tried to update 15.2.4 on Centos7 to 15.2.5?
I did a full: yum -y update on my first OSD node and after this no OSD
on this want to start anymore. No log will be written, so osd process
stops immediately i think.
Starting osd daemon in forground shows that no tmpfs will be mountet
under /var/lib/ceph/osd/ No kyering will be found!
[root@ceph1n011 ~]# ceph-osd --id 10
2020-09-23T15:20:47.380+0200 7f1e0a018bc0 -1 auth: unable to find a
keyring on /var/lib/ceph/osd/ceph-10/keyring: (2) No such file or directory
2020-09-23T15:20:47.380+0200 7f1e0a018bc0 -1
AuthRegistry(0x560ee2ab8938) no keyring found at
/var/lib/ceph/osd/ceph-10/keyring, disabling cephx
2020-09-23T15:20:47.382+0200 7f1e0a018bc0 -1 auth: unable to find a
keyring on /var/lib/ceph/osd/ceph-10/keyring: (2) No such file or directory
2020-09-23T15:20:47.382+0200 7f1e0a018bc0 -1
AuthRegistry(0x7ffe06f76400) no keyring found at
/var/lib/ceph/osd/ceph-10/keyring, disabling cephx
failed to fetch mon config (--no-mon-config to skip)
I checked all systemd realated files and found no differences so far.
This is quite strange and i look for some time to find the reason ..!?
Other OSD on other (untouched) node shows this on startup....
[root@ceph1n012 ~]# ceph-osd --id 24
2020-09-23T15:15:23.514+0200 7f55ae95abc0 -1 Falling back to public
interface
2020-09-23T15:15:43.143+0200 7f55ae95abc0 -1 osd.24 2154072
log_to_monitors {default=true}
[root@ceph1n012 ~]#
After some seconds osd process fork itself to background and works fine....
Does anybody have a clever hint for me?
Best regards,
Christoph
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