Add CephFS summary to ceph.md architecture page

[zdover23]

Add a CephFS summary to the ceph.md architecture page.

Summary by CodeRabbit

• Documentation
  • Expanded architecture documentation with comprehensive CephFS overview, including system design, metadata architecture, POSIX compliance, client access methods, performance characteristics, snapshots, quotas, security controls, and common use cases.

[coderabbitai]

📝 Walkthrough

Walkthrough

A new "CephFS in Summary" section has been added to the architecture documentation, covering CephFS introduction, architecture, POSIX compliance, client access methods, MDS design, performance characteristics, snapshots, security, and use cases. This is a documentation-only change with no code modifications.

Changes

Cohort / File(s)	Summary
Documentation Addition docs/architecture/ceph.md	Added comprehensive "CephFS in Summary" section covering architecture (MDS + RADOS separation), POSIX compliance, client access methods (kernel, FUSE, libcephfs), MDS design with failover capabilities, performance characteristics, snapshots/quotas, multi-filesystem support, security/access control (CephX, POSIX permissions, ACLs), and use cases.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Possibly related PRs

• doc: add architecture information to ceph.md #12: Adds architecture-focused content to docs/architecture/ceph.md with overlapping CephFS coverage, though this PR focuses specifically on a CephFS summary section.

Suggested reviewers

• senolcolak
• arttor

Poem

🐰 Through the warren of docs we hop,
CephFS knowledge, tip to top!
With architecture clear and bright,
The builders' path is now in sight! 📚✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding a CephFS summary section to the ceph.md architecture documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

🧹 Nitpick comments (1)

docs/architecture/ceph.md (1)

412-412: Consider specifying the CephFS version.

The phrase "Recent CephFS versions" is somewhat vague. If known, specifying the version that introduced multiple filesystem support (e.g., "CephFS Luminous and later" or "CephFS 12.x+") would be more helpful for readers.

🤖 Prompt for AI Agents

Verify each finding against the current code and only fix it if needed.

In `@docs/architecture/ceph.md` at line 412, Replace the vague phrase "Recent
CephFS versions" with a specific version reference: update the sentence to name
the release that added multiple independent filesystems (for example "CephFS
Luminous (v12.x) and later" or the exact version if known) so readers know which
CephFS release introduced this feature; locate and edit the sentence containing
"Recent CephFS versions" in the docs/architecture/ceph.md content and substitute
the precise version string while preserving the rest of the sentence.

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Nitpick comments:
In `@docs/architecture/ceph.md`:
- Line 412: Replace the vague phrase "Recent CephFS versions" with a specific
version reference: update the sentence to name the release that added multiple
independent filesystems (for example "CephFS Luminous (v12.x) and later" or the
exact version if known) so readers know which CephFS release introduced this
feature; locate and edit the sentence containing "Recent CephFS versions" in the
docs/architecture/ceph.md content and substitute the precise version string
while preserving the rest of the sentence.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d5d51d38-fef0-4d49-bf01-8c7f2ac5717b

📥 Commits

Reviewing files that changed from the base of the PR and between a281444 and fd96264.

📒 Files selected for processing (1)

• docs/architecture/ceph.md