Bug 16463 - aic7xxx: fails to notice if a disk is unplugged
Summary: aic7xxx: fails to notice if a disk is unplugged
Status: RESOLVED OBSOLETE
Alias: None
Product: SCSI Drivers
Classification: Unclassified
Component: Other (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: scsi_drivers-other
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2010-07-25 21:27 UTC by Rich Ercolani
Modified: 2012-08-09 15:01 UTC (History)
1 user (show)

See Also:
Kernel Version: 2.6.32-24-generic
Subsystem:
Regression: No
Bisected commit-id:

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Description Rich Ercolani 2010-07-25 21:27:18 UTC 
I have an external 7-disk array of SCA disks, connected to a backplane, with a disk module that speaks 40-pin Fast SCSI:
[   15.992335] scsi0 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 7.0
[   15.992336]         <Adaptec 2940 SCSI adapter>
[   15.992337]         aic7870: Single Channel A, SCSI Id=7, 16/253 SCBs

I was testing my RAID-6 setup on these, so I yanked one of them while they were in an MD. dmesg didn't report any change in disk status, and while any IO to the disk stalled in state D forever, Linux never noticed the disk was gone.

I tried using the convenient script I keep around for forcing rescans of SCSI and its related friends, which can be found at http://bash.cyberciti.biz/diskadmin/rescan-linux-scsi-bus/, but even after running that, the controller still didn't notice the disk was missing.
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