On 06/03/13 20:25, gurinder.shergill@xxxxxx wrote:
The dev_loss_tmo parameter controls how long the FC transport layer
insulates a loss of a remote port. It is defined to be between 1 and
SCSI_DEVICE_BLOCK_MAX_TIMEOUT (600). Different drivers do slightly different
checks when passed this parameter. This patch makes the dev_loss_tmo setting
uniform across all the drivers by pulling the common logic into the
transport layer function which is responsible for invoking the driver
provided callouts.
In addition, this patch also fixes a issue (see below), where dev_loss_tmo
could end up with a value more than SCSI_DEVICE_BLOCK_MAX_TIMEOUT when
fast_io_fail_tmo is enabled and then disabled. The change is to never
allow dev_loss_tmo to be out of its defined range. And, once that is a
given, then fast_io_fail_tmo can be capped by dev_loss_tmo.
Hello Sunny,
As far as I know some users set fast_io_fail_tmo such that dev_loss_tmo
can be set to a very large value in order to prevent that the SCSI host
number changes. Sorry but I'm not sure it's a good idea to remove that
functionality.
Bart.
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