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2. Fibre Channel
This section discusses the fibre channel API, native Red Hat Enterprise Linux 5 fibre channel
drivers, and the fibre channel capabilities of these drivers.
2.1. Fibre Channel API
Below is a list of
/sys/class/
In each item, host numbers are designated by
are
, and remote port numbers are
<L>
Transport:
/sys/class/fc_transport/target<H>:<B>:<T>/
•
— 24-bit port ID/address
port_id
•
— 64-bit node name
node_name
•
— 64-bit port name
port_name
Remote Port:
/sys/class/fc_remote_ports/rport-<H>:<B>-<R>/
•
port_id
•
node_name
•
port_name
•
— number of seconds to wait before marking a link as "bad". Once a link
dev_loss_tmo
is marked bad, IO running on its corresponding path (along with any new IO on that path)
will be failed.
The default
dev_loss_tmo
Qlogic adapter is used, the default is 35 seconds, while if an Emulex adapter is used, it is
30 seconds. The
module parameter
The maximum
dev_loss_tmo
value greater than 600, the driver's internal timeouts will be used instead.
•
fast_io_fail_tmo
problem is detected. IO that reaches the driver will fail. If IO is in a blocked queue, it will
not be failed until
Host:
/sys/class/fc_host/host<H>/
•
port_id
•
— instructs the driver to rediscover remote ports.
issue_lip
directories that contain files used to provide the userspace API.
.
<R>
value varies, depending on which driver/device is used. If a
value can be changed via the
dev_loss_tmo
, although the driver can override this timeout value.
dev_loss_tmo
value is 600 seconds. If
— length of time to wait before failing IO executed when a link
expires and the queue is unblocked.
dev_loss_tmo
, bus numbers are
<H>
dev_loss_tmo
Fibre Channel API
, targets are
, LUNs
<B>
<T>
scsi_transport_fc
is set to zero or any
5
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