1 Introduction
2 ============
3
4 ATA over Ethernet is a network protocol that p
5 block storage on the LAN.
6
7 http://support.coraid.com/documents/AoEr11.t
8
9 The EtherDrive (R) HOWTO for 2.6 and 3.x kerne
10
11 http://support.coraid.com/support/linux/Ethe
12
13 It has many tips and hints! Please see, espec
14 tunings for virtual memory:
15
16 http://support.coraid.com/support/linux/Ethe
17
18 The aoetools are userland programs that are de
19 driver. The aoetools are on sourceforge.
20
21 http://aoetools.sourceforge.net/
22
23 The scripts in this Documentation/admin-guide/
24 document the use of the driver and are not nec
25 the aoetools.
26
27
28 Creating Device Nodes
29 =====================
30
31 Users of udev should find the block device n
32 automatically, but to create all the necessa
33 udev configuration rules provided in udev.tx
34
35 There is a udev-install.sh script that shows
36 rules on your system.
37
38 There is also an autoload script that shows
39 /etc/modprobe.d/aoe.conf to ensure that the
40 necessary. Preloading the aoe module is pre
41 however, because AoE discovery takes a few s
42 confusing when an AoE device is not present
43 command is run but appears a second later.
44
45 Using Device Nodes
46 ==================
47
48 "cat /dev/etherd/err" blocks, waiting for er
49 like any retransmitted packets.
50
51 "echo eth2 eth4 > /dev/etherd/interfaces" te
52 limit ATA over Ethernet traffic to eth2 and
53 untrusted networks should be ignored as a ma
54 also the aoe_iflist driver option described
55
56 "echo > /dev/etherd/discover" tells the driv
57 devices are available.
58
59 In the future these character devices may di
60 by sysfs counterparts. Using the commands i
61 users from these implementation details.
62
63 The block devices are named like this::
64
65 e{shelf}.{slot}
66 e{shelf}.{slot}p{part}
67
68 ... so that "e0.2" is the third blade from t
69 first shelf (shelf address zero). That's th
70 partition on that disk would be "e0.2p1".
71
72 Using sysfs
73 ===========
74
75 Each aoe block device in /sys/block has the
76 state, mac, and netif. The state attribute
77 is ready for I/O and "down" if detected but
78 "down,closewait" state shows that the device
79 cannot come up again until it has been close
80
81 The mac attribute is the ethernet address of
82 The netif attribute is the network interface
83 through which we are communicating with the
84
85 There is a script in this directory that for
86 a convenient way. Users with aoetools shoul
87 command::
88
89 root@makki root# sh Documentation/admin-gu
90 e10.0 eth3 up
91 e10.1 eth3 up
92 e10.2 eth3 up
93 e10.3 eth3 up
94 e10.4 eth3 up
95 e10.5 eth3 up
96 e10.6 eth3 up
97 e10.7 eth3 up
98 e10.8 eth3 up
99 e10.9 eth3 up
100 e4.0 eth1 up
101 e4.1 eth1 up
102 e4.2 eth1 up
103 e4.3 eth1 up
104 e4.4 eth1 up
105 e4.5 eth1 up
106 e4.6 eth1 up
107 e4.7 eth1 up
108 e4.8 eth1 up
109 e4.9 eth1 up
110
111 Use /sys/module/aoe/parameters/aoe_iflist (o
112 option discussed below) instead of /dev/ethe
113 AoE traffic to the network interfaces in the
114 whitespace-separated list. Unlike the old c
115 sysfs entry can be read from as well as writ
116
117 It's helpful to trigger discovery after sett
118 interfaces. The aoetools package provides a
119 for this purpose. You can also directly use
120 /dev/etherd/discover special file described
121
122 Driver Options
123 ==============
124
125 There is a boot option for the built-in aoe
126 corresponding module parameter, aoe_iflist.
127 all network interfaces may be used for ATA o
128 usage example for the module parameter::
129
130 modprobe aoe_iflist="eth1 eth3"
131
132 The aoe_deadsecs module parameter determines
133 seconds that the driver will wait for an AoE
134 response to an AoE command. After aoe_deads
135 elapsed, the AoE device will be marked as "d
136 is supported for testing purposes and makes
137 trying AoE commands forever.
138
139 The aoe_maxout module parameter has a defaul
140 maximum number of unresponded packets that w
141 target at one time.
142
143 The aoe_dyndevs module parameter defaults to
144 driver will assign a block device minor numb
145 target based on the order of its discovery.
146 device numbers in use, a greater range of Ao
147 addresses can be supported. Users with udev
148 think about minor numbers. Using aoe_dyndev
149 to be pre-created using a static minor-numbe
150 aoe-mkshelf script in the aoetools.
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