Document filesystem-smaller-than-partition failure mode for persistent disks

[neddp]

When a persistent disk is resized, the partition resize can succeed while the filesystem grow fails (e.g. resize2fs: Permission denied due to pre-existing ext4 errors). Subsequent deploys then silently succeed, leaving the filesystem undersized with no visible error.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

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Run ID: e37a62f3-285f-4360-9d7c-5130ecaed5e1

📥 Commits

Reviewing files that changed from the base of the PR and between 304c4aa and 7d1fa28.

📒 Files selected for processing (1)

• content/persistent-disks.md

Walkthrough

Added documentation for persistent-disk resize failures where partition growth succeeds but filesystem growth fails. The documentation describes the resulting partition and filesystem size mismatch, explains why later deployments cannot retry the resize, and includes representative Director and kernel error messages.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the documented persistent disk failure mode involving a filesystem smaller than its partition.
Description check	✅ Passed	The description directly explains the persistent disk resizing failure and its impact on subsequent deployments.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch document-filesystem-smaller-than-partition

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Actionable comments posted: 1

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Inline comments:
In `@content/persistent-disks.md`:
- Around line 129-132: Revise the persistent-disk resize description to scope
the partition-then-filesystem sequence and its failure consequences to the
native resize path governed by the resize_disk contract. Clarify that this
applies only when director.enable_cpi_resize_disk is enabled and the CPI
supports native resizing, while distinguishing the fallback path that creates a
new disk and copies data.

Apply the same fix in `@content/persistent-disks.md` around lines 131 - 132.

Apply the same fix in `@content/persistent-disks.md` at line 152.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

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Run ID: 1291ce5b-9a4f-4a74-9999-ddca869576ad

📥 Commits

Reviewing files that changed from the base of the PR and between f504727 and 304c4aa.

📒 Files selected for processing (1)

• content/persistent-disks.md

[rkoster]

Maybe it would be good to also document how to get out of this situation