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# -*- mode: YAML -*-
---
options:
- name: crimson_osd_obc_lru_size
type: uint
level: advanced
desc: Number of obcs to cache
default: 512
- 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_cpu_cores
type: str
level: advanced
desc: CPU cores on which seastar reactor threads will run in cpuset(7) format, smp::count is deduced from this option
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
flags:
- startup
- name: crimson_seastar_num_threads
type: uint
level: advanced
default: 0
desc: The number of threads for serving seastar reactors without CPU pinning, overridden if crimson_seastar_cpu_cores is set
flags:
- startup
min: 0
max: 32
- name: crimson_osd_stat_interval
type: int
level: advanced
default: 0
desc: Report OSD status periodically in seconds, 0 to disable
- 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
# TODO: implement sub-extent checksum and deprecate this configuration.
- name: seastore_full_integrity_check
type: bool
level: dev
desc: Whether seastore need to fully check the integrity of each extent,
non-full integrity check means the integrity check might be skipped
during extent remapping for better performance, disable with caution
default: false
# TODO: seastore_max_data_allocation_size should be dropped once the sub-extent
# read/checksum is implemented.
- name: seastore_max_data_allocation_size
type: size
level: advanced
desc: Max size in bytes that an extent can be
default: 32_K
- 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
# TODO: seastore_obj_data_write_amplification is no longer correct if
# seastore_data_delta_based_overwrite is enabled. So, this should be reconsidered.
- 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
- name: seastore_data_delta_based_overwrite
type: size
level: dev
desc: overwrite the existing data block based on delta if the overwrite size is equal to or less than the value, otherwise do overwrite based on remapping, set to 0 to enforce the remap-based overwrite.
default: 0
- name: seastore_disable_end_to_end_data_protection
type: bool
level: dev
desc: When false, upon mkfs, try to discover whether the nvme device supports
internal checksum feature without using sever CPU then enable if available,
set to true to disable unconditionally.
default: true
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