13 Apr
2021
13 Apr
'21
2:18 p.m.
Backend:
XFS for the filestore back-end.
In our testing, we found the performance decreases when cluster usage exceed default
nearfull ratio(85%), is it by design?
14 Apr
14 Apr
12:40 a.m.
It might be more accurate to say that the default nearfull is 85% for
that reason, among others. Raising it will probably not get you enough
storage to be worth the hassle.
On Tue, Apr 13, 2021 at 7:18 AM zp_8483 <zp_8483(a)163.com> wrote:
>
> Backend:
>
> XFS for the filestore back-end.
>
>
> In our testing, we found the performance decreases when cluster usage exceed default
nearfull ratio(85%), is it by design?
>
>
>
> _______________________________________________
> ceph-users mailing list -- ceph-users(a)ceph.io
> To unsubscribe send an email to ceph-users-leave(a)ceph.io
3:29 a.m.
We noticed this degraded write performance too recently when the nearfull flag is present
(cephfs kernel client, kernel 4.19.154).
Appears to be due to forced synchronous writes when nearfull.
https://github.com/ceph/ceph-client/blob/558b4510f622a3d96cf9d95050a04e7793…
https://tracker.ceph.com/issues/49406
It might be more accurate to say that the default
nearfull is 85% for
that reason, among others. Raising it will probably not get you enough
storage to be worth the hassle.
On Tue, Apr 13, 2021 at 7:18 AM zp_8483 <zp_8483(a)163.com> wrote:
Backend:
XFS for the filestore back-end.
In our testing, we found the performance decreases when cluster usage exceed default
nearfull ratio(85%), is it by design?
_______________________________________________
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To unsubscribe send an email to ceph-users-leave(a)ceph.io
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To unsubscribe send an email to ceph-users-leave(a)ceph.io
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2 comments
3 participants
participants (3)
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Dylan McCulloch -
Nathan Fish -
zp_8483