Deep scrubbing causes severe I/O stalling

[Kees Meijs <kees@xxxxxxxx>]

Hi Cephers,

Using Ceph 0.94.9-1trusty we noticed severe I/O stalling during deep scrubbing (vanilla parameters used in regards to scrubbing). I'm aware this has been discussed before, but I'd like to share the parameters we're going to evaluate:

• osd_scrub_begin_hour 1
• osd_scrub_end_hour 7
• osd_scrub_min_interval 259200
• osd_scrub_max_interval 1814400
• osd_scrub_chunk_max 5
• osd_scrub_sleep .1
• osd_deep_scrub_interval 1814400
• osd_deep_scrub_stride 1048576

Anyway, thoughts on the matter or specific parameter advice is more than welcome.

Cheers,
Kees

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