#8 megasasctl Crash on Degraded Array.

v1.0 (example)
open
antibozo
None
5
2014-01-22
2014-01-21
Pat Suwalski
No

When my controller has a failed disk, megasasctl fails.

# megasasctl 
me so crazy, me think adapter crazy too. sorry, mister.
/usr/sbin/megasasctl: line 15: 28073 Segmentation fault      /usr/lib/megactl/megasasctl $@

I have tracked the problem down to a bad assumption, that the various disk enumeration loops would use the number of currently online drives as the basis for the iterator.

This number decreases when a disk fails. It is not noticeable in many cases, because on many some controllers pinfo->pd_present_count is one higher than the actual number of disks. However, the same situation would be encountered in a RAID1 system with two failed disks.

The attached one-line patch uses the number of ports on the controller as the basis.

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Discussion

  • Pat Suwalski
    Pat Suwalski
    2014-01-22

    My patch apparently broke one of my PERC6e with external storage shelf, because the number of ports is not properly defined for this hardware.

    The updated patch attached deals with the case where the number of ports reported is less than the number of known currently active drives.

     
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