# -*- mode: YAML -*-
---

options:
- name: crimson_osd_obc_lru_size
  type: uint
  level: advanced
  desc: Number of obcs to cache
  default: 10
- name: crimson_osd_scheduler_concurrency
  type: uint
  level: advanced
  desc: The maximum number concurrent IO operations, 0 for unlimited
  default: 0
- name: crimson_alien_op_num_threads
  type: uint
  level: advanced
  desc: The number of threads for serving alienized ObjectStore
  default: 6
  flags:
  - startup
- name: crimson_seastar_smp
  type: uint
  level: advanced
  desc: Number of seastar reactor threads to use for the osd
  default: 1
  flags:
  - startup
- name: crimson_alien_thread_cpu_cores
  type: str
  level: advanced
  desc: CPU cores on which alienstore threads will run in cpuset(7) format
- name: seastore_segment_size
  type: size
  desc: Segment size to use for SegmentManager
  level: advanced
  default: 64_M
- name: seastore_device_size
  type: size
  desc: Total size to use for SegmentManager block file if created
  level: dev
  default: 50_G
- name: seastore_block_create
  type: bool
  level: dev
  desc: Create SegmentManager file if it doesn't exist
  default: true
  see_also:
  - seastore_device_size
- name: seastore_journal_batch_capacity
  type: uint
  level: dev
  desc: The number limit of records in a journal batch
  default: 16
- name: seastore_journal_batch_flush_size
  type: size
  level: dev
  desc: The size threshold to force flush a journal batch
  default: 16_M
- name: seastore_journal_iodepth_limit
  type: uint
  level: dev
  desc: The io depth limit to submit journal records
  default: 5
- name: seastore_journal_batch_preferred_fullness
  type: float
  level: dev
  desc: The record fullness threshold to flush a journal batch
  default: 0.95
- name: seastore_default_max_object_size
  type: uint
  level: dev
  desc: default logical address space reservation for seastore objects' data
  default: 16777216
- name: seastore_default_object_metadata_reservation
  type: uint
  level: dev
  desc: default logical address space reservation for seastore objects' metadata
  default: 16777216
- name: seastore_cache_lru_size
  type: size
  level: advanced
  desc: Size in bytes of extents to keep in cache.
  default: 64_M
- name: seastore_obj_data_write_amplification
  type: float
  level: advanced
  desc: split extent if ratio of total extent size to write size exceeds this value
  default: 1.25
- name: seastore_max_concurrent_transactions
  type: uint
  level: advanced
  desc: maximum concurrent transactions that seastore allows
  default: 8
- name: seastore_main_device_type
  type: str
  level: dev
  desc: The main device type seastore uses (SSD or RANDOM_BLOCK_SSD)
  default: SSD
- name: seastore_cbjournal_size
  type: size
  level: dev
  desc: Total size to use for CircularBoundedJournal if created, it is valid only if seastore_main_device_type is RANDOM_BLOCK
  default: 5_G
- name: seastore_multiple_tiers_stop_evict_ratio
  type: float
  level: advanced
  desc: When the used ratio of main tier is less than this value, then stop evict cold data to the cold tier.
  default: 0.5
- name: seastore_multiple_tiers_default_evict_ratio
  type: float
  level: advanced
  desc: Begin evicting cold data to the cold tier when the used ratio of the main tier reaches this value.
  default: 0.6
- name: seastore_multiple_tiers_fast_evict_ratio
  type: float
  level: advanced
  desc: Begin fast eviction when the used ratio of the main tier reaches this value.
  default: 0.7