Add num_disks into stat

[xiaoxichen]

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[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.28%. Comparing base (1746bcc) to head (31cf583).
Report is 9 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #239      +/-   ##
==========================================
+ Coverage   63.15%   65.28%   +2.12%     
==========================================
  Files          32       32              
  Lines        1900     1982      +82     
  Branches      204      213       +9     
==========================================
+ Hits         1200     1294      +94     
+ Misses        600      581      -19     
- Partials      100      107       +7     

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