Dear all!
In our Hammer cluster we are planning to switch our failure domain from host to
chassis. We have performed some simulations, and regardless of the settings we
have used some slow requests have appeared all the time.
we had the the following settings:
"osd_max_backfills": "1",
"osd_backfill_full_ratio": "0.85",
"osd_backfill_retry_interval": "10",
"osd_backfill_scan_min": "1",
"osd_backfill_scan_max": "4",
"osd_kill_backfill_at": "0",
"osd_debug_skip_full_check_in_backfill_reservation": "false",
"osd_debug_reject_backfill_probability": "0",
"osd_min_recovery_priority": "0",
"osd_allow_recovery_below_min_size": "true",
"osd_recovery_threads": "1",
"osd_recovery_thread_timeout": "60",
"osd_recovery_thread_suicide_timeout": "300",
"osd_recovery_delay_start": "0",
"osd_recovery_max_active": "1",
"osd_recovery_max_single_start": "1",
"osd_recovery_max_chunk": "8388608",
"osd_recovery_forget_lost_objects": "false",
"osd_recovery_op_priority": "1",
"osd_recovery_op_warn_multiple": "16",
we have also tested it with the CFQ IO scheduler on the OSDs and the following
params:
"osd_disk_thread_ioprio_priority": "7"
"osd_disk_thread_ioprio_class": "idle"
and the nodeep-scrub set.
Is there anything else to try? Is there a good way to switch from one kind of
failure domain to an other without slow requests?
Thank you in advance for any suggestions.
Kind regards,
Laszlo
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