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With bluestore, making the smallest write match min_alloc_size avoids write amplification. With EC pools this is the stripe unit, or stripe_width / num_data_chunks. Rather than requiring people to divide by k to get the smallest ec write, allow it to be specified directly via stripe_unit. Store it in the ec profile so changing a monitor config option isn't necessary to set it. This is particularly important for ec overwrites since they allow random i/o which should match bluestore's checksum granularity (aka min_alloc_size). Signed-off-by: Josh Durgin <jdurgin@redhat.com> |
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| .. | ||
| add-or-rm-mons.rst | ||
| add-or-rm-osds.rst | ||
| cache-tiering.rst | ||
| control.rst | ||
| crush-map.rst | ||
| data-placement.rst | ||
| erasure-code-isa.rst | ||
| erasure-code-jerasure.rst | ||
| erasure-code-lrc.rst | ||
| erasure-code-profile.rst | ||
| erasure-code-shec.rst | ||
| erasure-code.rst | ||
| index.rst | ||
| monitoring-osd-pg.rst | ||
| monitoring.rst | ||
| operating.rst | ||
| pg-concepts.rst | ||
| pg-states.rst | ||
| placement-groups.rst | ||
| pools.rst | ||
| user-management.rst | ||