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Bug 2027719

Summary:	oVirt Managed Block Storage with Ceph backend is't support QoS options
Product:	[oVirt] ovirt-engine	Reporter:	Konstantin Shalygin <shalygin.k>
Component:	BLL.Storage	Assignee:	Nobody <nobody>
Status:	CLOSED WONTFIX	QA Contact:	Avihai <aefrat>
Severity:	high	Docs Contact:
Priority:	unspecified
Version:	4.4.8.4	CC:	ahadas, bugs, bzlotnik, michal.skrivanek
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	All
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-12-19 19:39:07 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	Storage	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Konstantin Shalygin 2021-11-30 13:36:01 UTC

Description of problem:

Managed Block Storage with Ceph backend is't support QoS options

Version-Release number of selected component (if applicable): 4.4.8


Actual results:

oVirt Host use kernel rbd driver to mount disk. And admin can't use different method.

Expected results:

oVirt administrator optionally can use libvirt rbd driver. The userspace driver can be easy updated without oVirt host downtime's for kernel reboot and librbd support all RBD QoS options:

rbd_qos_iops_limit
rbd_qos_bps_limit
rbd_qos_read_iops_limit
rbd_qos_write_iops_limit
rbd_qos_read_bps_limit
rbd_qos_write_bps_limit
rbd_qos_iops_burst
rbd_qos_bps_burst
rbd_qos_read_iops_burst
rbd_qos_write_iops_burst
rbd_qos_read_bps_burst
rbd_qos_write_bps_burst
rbd_qos_schedule_tick_min

Additional info:

RBD QoS settings: https://docs.ceph.com/en/pacific/rbd/rbd-config-ref/#qos-settings

libvirt rbd driver: https://libvirt.org/storage.html#StorageBackendRBD

Comment 1 RHEL Program Management 2021-11-30 17:19:44 UTC

The documentation text flag should only be set after 'doc text' field is provided. Please provide the documentation text and set the flag to '?' again.

Comment 2 Michal Skrivanek 2021-12-01 08:09:43 UTC

we have bigger gaps in feature parity for MBS/Ceph. Realistically we won't get to it any time soon, but patches are welcomed

Comment 4 Benny Zlotnik 2021-12-13 15:20:39 UTC

kRBD is our default because of superior performance, allowing choice between kRBD and librbd would require support for rbd-nbd from cinderlib

Comment 5 Arik 2021-12-19 19:39:07 UTC

Closing based on comment 4
If you like to contribute this change (choosing between kRBD and librbd), please feel free to reopen