/Documentation/aoe/aoe.txt

 1The EtherDrive (R) HOWTO for users of 2.6 kernels is found at ...
 2
 3  http://www.coraid.com/support/linux/EtherDrive-2.6-HOWTO.html
 4
 5  It has many tips and hints!
 6
 7CREATING DEVICE NODES
 8
 9  Users of udev should find the block device nodes created
10  automatically, but to create all the necessary device nodes, use the
11  udev configuration rules provided in udev.txt (in this directory).
12
13  There is a udev-install.sh script that shows how to install these
14  rules on your system.
15
16  If you are not using udev, two scripts are provided in
17  Documentation/aoe as examples of static device node creation for
18  using the aoe driver.
19
20    rm -rf /dev/etherd
21    sh Documentation/aoe/mkdevs.sh /dev/etherd
22
23  ... or to make just one shelf's worth of block device nodes ...
24
25    sh Documentation/aoe/mkshelf.sh /dev/etherd 0
26
27  There is also an autoload script that shows how to edit
28  /etc/modprobe.conf to ensure that the aoe module is loaded when
29  necessary.
30
31USING DEVICE NODES
32
33  "cat /dev/etherd/err" blocks, waiting for error diagnostic output,
34  like any retransmitted packets.
35
36  "echo eth2 eth4 > /dev/etherd/interfaces" tells the aoe driver to
37  limit ATA over Ethernet traffic to eth2 and eth4.  AoE traffic from
38  untrusted networks should be ignored as a matter of security.
39
40  "echo > /dev/etherd/discover" tells the driver to find out what AoE
41  devices are available.
42
43  These character devices may disappear and be replaced by sysfs
44  counterparts, so distribution maintainers are encouraged to create
45  scripts that use these devices.
46
47  The block devices are named like this:
48
49	e{shelf}.{slot}
50	e{shelf}.{slot}p{part}
51
52  ... so that "e0.2" is the third blade from the left (slot 2) in the
53  first shelf (shelf address zero).  That's the whole disk.  The first
54  partition on that disk would be "e0.2p1".
55
56USING SYSFS
57
58  Each aoe block device in /sys/block has the extra attributes of
59  state, mac, and netif.  The state attribute is "up" when the device
60  is ready for I/O and "down" if detected but unusable.  The
61  "down,closewait" state shows that the device is still open and
62  cannot come up again until it has been closed.
63
64  The mac attribute is the ethernet address of the remote AoE device.
65  The netif attribute is the network interface on the localhost
66  through which we are communicating with the remote AoE device.
67
68  There is a script in this directory that formats this information
69  in a convenient way.
70
71  root@makki root# sh Documentation/aoe/status.sh 
72     e10.0            eth3              up
73     e10.1            eth3              up
74     e10.2            eth3              up
75     e10.3            eth3              up
76     e10.4            eth3              up
77     e10.5            eth3              up
78     e10.6            eth3              up
79     e10.7            eth3              up
80     e10.8            eth3              up
81     e10.9            eth3              up
82      e4.0            eth1              up
83      e4.1            eth1              up
84      e4.2            eth1              up
85      e4.3            eth1              up
86      e4.4            eth1              up
87      e4.5            eth1              up
88      e4.6            eth1              up
89      e4.7            eth1              up
90      e4.8            eth1              up
91      e4.9            eth1              up