Re: Discussion to change SD_TIMEOUT in the sd driver

[dhjohnso]

I think there needs to be a command or setable parameter that allows
setting the default timeout for a SCSI disk device to a value
in seconds. The system should supply a default of something like 30
seconds. Keep in mind that some SCSI disks will actually be virtualized
luns in a disk subsystem, like the IBM ESS (Shark). It can be useful in
this case to raise the default timeout value to
allow subsystem conditions that hold off I/O to not result in timeouts.

There also needs to be a setable parameter per device of the maximum tag
queue depth allowed because again luns inside
a disk subsystem may support and exploit very large queue depths. Much
larger than a JBOD can provide.

Dick Johnson, IBM



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