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[DOC-14595][AI] Document disk_io_optimized for reader and writer threads - #4158

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[DOC-14595][AI] Document disk_io_optimized for reader and writer threads#4158
TimLFletcher wants to merge 1 commit into
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DOC-14595

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@TimLFletcher TimLFletcher commented Sep 4, 2026

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Fixes DOC-14595.

What changed

modules/rest-api/pages/rest-reader-writer-thread-config.adoc (Setting Storage Thread Allocations).

num_reader_threads and num_writer_threads were described only as taking a number of threads. Neither mentioned disk_io_optimized, so a reader working from the REST reference had no way to discover it. Added the accepted value to both parameter descriptions and to the curl syntax block, with a link to Data Settings for guidance on when to use it.

Where the facts came from

Nothing here is invented. Every claim traces to the ticket or to existing pages in this repository:

Claim Source
disk_io_optimized is accepted by both parameters Ticket, including a working curl example
It allocates threads equal to the number of CPU cores manage/manage-settings/general-settings.adoc:224
Recommended for Magma buckets learn/buckets-memory-and-storage/storage-engines.adoc:49

I deliberately did not add default as a documented value. The UI has a Default option and the sibling num_nonio_threads parameter documents a default value, so it is probably accepted here too, but neither the ticket nor this repository states it. Worth a follow-up if someone can confirm.

Verification

Anchor [#data-settings] confirmed at general-settings.adoc:196, by inspection, since Antora validates xref page targets but not #fragment anchors.

PASS[docs-server @ DOC-14595]: no new build diagnostics.

🤖 Generated with Claude Code

The Setting Storage Thread Allocations reference described
num_reader_threads and num_writer_threads as taking a number of threads,
without mentioning that they also accept disk_io_optimized. That value
corresponds to the Disk i/o optimized option already documented under Data
Settings, which storage-engines.adoc recommends for Magma buckets.

Adds the accepted value to both parameter descriptions and to the curl
syntax block, and links to Data Settings for guidance on when to use it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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