On Aug 9, 2013, at 12:58 , Frank Kardel wrote:
> Module Name: src
> Committed By: kardel
> Date: Fri Aug 9 19:58:44 UTC 2013
>
> Modified Files:
> src/sys/dev/scsipi: ch.c
>
> Log Message:
> bump command timeout to 5 minutes. several
> types of changers (Overland PowerLoader, Dell
> PowerVault) have been exceeding the 100 sec
> limit aborting a perfectly (slowly) progressing
> operation.
Upon further reflection, I believe that this timeout value should be a
device-specific tunable parameter because there is such wide variation in
changer behavior/performance; perhaps by kernel config, or by sysctl(8) on a
per-device-node basis. Or some other mechanism you prefer.
I believe that baking it into the kernel as a constant is not good design
because we'll just see another commit just like this one at some later date,
continuing to patch around the design problem.
Erik