What are default and maximum values of dev_loss_tmo in Red Hat Enterprise Linux 6

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环境

• Red Hat Enterprise Linux 5
• Red Hat Enterprise Linux 6

问题

What’s the default value of dev_loss_tmo?

What’s the maximum value of dev_loss_tmo?

决议

The default dev_loss_tmo value varies, depending on which driver/device is used. If a Qlogic adapter is used, the default is 35 seconds, while if an Emulex adapter is used, it is 30 seconds. The dev_loss_tmo value can be changed via the scsi_transport_fc module parameter dev_loss_tmo, although the driver can override this timeout value.