Documentation/aoe/aoe.txt

   1 The 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
   7 CREATING 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
  31 USING 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
  56 USING 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