A bit late to the game, but I'm not sure if it is your drives. I had a very
similar issue to yours on enterprise drives (not that means much outside of
support).
What I was seeing is that a rebuild would kick off, PGs would instantly start
to become laggy and then our clients (openstack rbd) wo
Hey
I have seen that kind of behavior in the past and we manage to flash the
firmware to increase the cache size, which will kill the drive a little bit
faster so only to use in lab environments. I'm unaware if the Samsung
magician software can do that.
btw, a few evo's 9xx are listed by Samsung to
Hi,
I'm just writing to share some old knowledge, which is:
never, ever use consumer ssd for ceph!
see e.g.
https://old.reddit.com/r/Proxmox/comments/izg6e5/questions_on_running_ceph_using_consumer_ssds/g6it9uv/
--
Mit freundlichen Grüßen / Regards
Sven Kieske
Systementwickler / systems engin
ry likely there is a SLC cache in use.
Best regards,
Michael
-Ursprüngliche Nachricht-
Von: Marc
Gesendet: Dienstag, 21. Februar 2023 11:27
An: Michael Wodniok ; ceph-users@ceph.io; Phil Regnauld
Betreff: RE: [ceph-users] Re: Do not use SSDs with (small) SLC cache
What fio test woul
drive
>
> Best regards,
> Michael
>
> -Ursprüngliche Nachricht-----
> Von: mailing-lists
> Gesendet: Dienstag, 21. Februar 2023 10:21
> An: ceph-users@ceph.io
> Betreff: [ceph-users] Re: Do not use SSDs with (small) SLC cache
>
> Dear Michael,
>
> I don'
Michael Wodniok (wodniok) writes:
> Hi all,
>
> digging around debugging, why our (small: 10 Hosts/~60 OSDs) cluster is so
> slow even while recovering I found out one of our key issues are some SSDs
> with SLC cache (in our case Samsung SSD 870 EVO) - which we just recycled
> from other use ca
solid-state-drive
Best regards,
Michael
-Ursprüngliche Nachricht-
Von: mailing-lists
Gesendet: Dienstag, 21. Februar 2023 10:21
An: ceph-users@ceph.io
Betreff: [ceph-users] Re: Do not use SSDs with (small) SLC cache
Dear Michael,
I don't have an explanation for your problem
Dear Michael,
I don't have an explanation for your problem unfortunately, but I just
wondered that you experience a drop in performance, that this SSD
shouldn't have. Your SSDs drives (Samsung 870 EVO) should not get slower
on large writes. You can verify this on the post you've attached [1] o
