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How to speed up / slow down deep-scrubbing

This document (000019684) is provided subject to the disclaimer at the end of this document.


SUSE Enterprise Storage 5.5
SUSE Enterprise Storage 6


Customer has noticed that deep-scrubbing has fallen behind. 


If impacting ceph performance is not a concern, the following could be done:
Configure *osd max scrubs* and *osd scrub load threshold* to do more scrubbing work, but be careful as it will have a huge impact on performance.

Get current configuration by running the following command on an OSD node:

# ceph daemon osd.$osdID config show | egrep "osd_max_scrubs|osd_scrub_load"
# ceph daemon osd.22 config show | egrep "osd_max_scrubs|osd_scrub_load"
    "osd_max_scrubs": "1",
    "osd_scrub_load_threshold": "0.500000",

Assuming that impacting cluster clients is of no concern.
If system load average is above .5, then increase osd_scrub_load_threshold, 
For system load average see: uptime, cat /proc/loadavg, top, sar -q 1 5, w
if load average is above consider increasing "osd scrub load threshold=", but may want to check randomly through out the day.
salt -I roles:storage "sar -q 1 5"
salt -I roles:storage "cat /proc/loadavg"
salt -I roles:storage "uptime"

Otherwise increase osd_max_scrubs:
ceph tell 'osd.*' injectargs --osd_max_scrubs=2 --osd_scrub_load_threshold=3

Validate with:
# ceph daemon $osdID config show | egrep "osd_max_scrubs|osd_scrub_load"
# ceph daemon $osdID config diff

Values will vary on each cluster.
Monitor for desired results with "ceph -s", etc....
If need drop back values back down closer to defaults if the commands negatively impact the cluster.


Cluster may have been backfilling.
Cluster may have client load.


Top Issue


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  • Document ID:000019684
  • Creation Date: 14-Aug-2020
  • Modified Date:14-May-2024
    • SUSE Enterprise Storage

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