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authorEd Cashin <ecashin@coraid.com>2012-10-05 00:16:49 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-05 18:05:30 (GMT)
commit5b8c4be381a81617b60488ac3bd1b3e5cda32218 (patch)
tree819879dc69962d7f73f9a97aa11e0e11c8ceeb16 /Documentation/aoe
parent1ac9e602625817b0c16cc70ea496875f7bd58a4d (diff)
aoe: update documentation to better reflect aoe-plus-udev usage
Signed-off-by: Ed Cashin <ecashin@coraid.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/aoe')
-rw-r--r--Documentation/aoe/aoe.txt49
-rw-r--r--Documentation/aoe/mkdevs.sh41
-rw-r--r--Documentation/aoe/mkshelf.sh28
-rw-r--r--Documentation/aoe/status.sh3
4 files changed, 35 insertions, 86 deletions
diff --git a/Documentation/aoe/aoe.txt b/Documentation/aoe/aoe.txt
index b3e4756..bfc9cb1 100644
--- a/Documentation/aoe/aoe.txt
+++ b/Documentation/aoe/aoe.txt
@@ -1,3 +1,8 @@
+ATA over Ethernet is a network protocol that provides simple access to
+block storage on the LAN.
+
+ http://support.coraid.com/documents/AoEr11.txt
+
The EtherDrive (R) HOWTO for 2.6 and 3.x kernels is found at ...
http://support.coraid.com/support/linux/EtherDrive-2.6-HOWTO.html
@@ -26,20 +31,12 @@ CREATING DEVICE NODES
There is a udev-install.sh script that shows how to install these
rules on your system.
- If you are not using udev, two scripts are provided in
- Documentation/aoe as examples of static device node creation for
- using the aoe driver.
-
- rm -rf /dev/etherd
- sh Documentation/aoe/mkdevs.sh /dev/etherd
-
- ... or to make just one shelf's worth of block device nodes ...
-
- sh Documentation/aoe/mkshelf.sh /dev/etherd 0
-
There is also an autoload script that shows how to edit
/etc/modprobe.d/aoe.conf to ensure that the aoe module is loaded when
- necessary.
+ necessary. Preloading the aoe module is preferable to autoloading,
+ however, because AoE discovery takes a few seconds. It can be
+ confusing when an AoE device is not present the first time the a
+ command is run but appears a second later.
USING DEVICE NODES
@@ -54,9 +51,9 @@ USING DEVICE NODES
"echo > /dev/etherd/discover" tells the driver to find out what AoE
devices are available.
- These character devices may disappear and be replaced by sysfs
- counterparts. Using the commands in aoetools insulates users from
- these implementation details.
+ In the future these character devices may disappear and be replaced
+ by sysfs counterparts. Using the commands in aoetools insulates
+ users from these implementation details.
The block devices are named like this:
@@ -79,8 +76,8 @@ USING SYSFS
The netif attribute is the network interface on the localhost
through which we are communicating with the remote AoE device.
- There is a script in this directory that formats this information
- in a convenient way. Users with aoetools can use the aoe-stat
+ There is a script in this directory that formats this information in
+ a convenient way. Users with aoetools should use the aoe-stat
command.
root@makki root# sh Documentation/aoe/status.sh
@@ -124,3 +121,21 @@ DRIVER OPTIONS
usage example for the module parameter.
modprobe aoe_iflist="eth1 eth3"
+
+ The aoe_deadsecs module parameter determines the maximum number of
+ seconds that the driver will wait for an AoE device to provide a
+ response to an AoE command. After aoe_deadsecs seconds have
+ elapsed, the AoE device will be marked as "down".
+
+ The aoe_maxout module parameter has a default of 128. This is the
+ maximum number of unresponded packets that will be sent to an AoE
+ target at one time.
+
+ The aoe_dyndevs module parameter defaults to 1, meaning that the
+ driver will assign a block device minor number to a discovered AoE
+ target based on the order of its discovery. With dynamic minor
+ device numbers in use, a greater range of AoE shelf and slot
+ addresses can be supported. Users with udev will never have to
+ think about minor numbers. Using aoe_dyndevs=0 allows device nodes
+ to be pre-created using a static minor-number scheme with the
+ aoe-mkshelf script in the aoetools.
diff --git a/Documentation/aoe/mkdevs.sh b/Documentation/aoe/mkdevs.sh
deleted file mode 100644
index 44c0ab7..0000000
--- a/Documentation/aoe/mkdevs.sh
+++ /dev/null
@@ -1,41 +0,0 @@
-#!/bin/sh
-
-n_shelves=${n_shelves:-10}
-n_partitions=${n_partitions:-16}
-
-if test "$#" != "1"; then
- echo "Usage: sh `basename $0` {dir}" 1>&2
- echo " n_partitions=16 sh `basename $0` {dir}" 1>&2
- exit 1
-fi
-dir=$1
-
-MAJOR=152
-
-echo "Creating AoE devnode files in $dir ..."
-
-set -e
-
-mkdir -p $dir
-
-# (Status info is in sysfs. See status.sh.)
-# rm -f $dir/stat
-# mknod -m 0400 $dir/stat c $MAJOR 1
-rm -f $dir/err
-mknod -m 0400 $dir/err c $MAJOR 2
-rm -f $dir/discover
-mknod -m 0200 $dir/discover c $MAJOR 3
-rm -f $dir/interfaces
-mknod -m 0200 $dir/interfaces c $MAJOR 4
-rm -f $dir/revalidate
-mknod -m 0200 $dir/revalidate c $MAJOR 5
-rm -f $dir/flush
-mknod -m 0200 $dir/flush c $MAJOR 6
-
-export n_partitions
-mkshelf=`echo $0 | sed 's!mkdevs!mkshelf!'`
-i=0
-while test $i -lt $n_shelves; do
- sh -xc "sh $mkshelf $dir $i"
- i=`expr $i + 1`
-done
diff --git a/Documentation/aoe/mkshelf.sh b/Documentation/aoe/mkshelf.sh
deleted file mode 100644
index 3261581..0000000
--- a/Documentation/aoe/mkshelf.sh
+++ /dev/null
@@ -1,28 +0,0 @@
-#! /bin/sh
-
-if test "$#" != "2"; then
- echo "Usage: sh `basename $0` {dir} {shelfaddress}" 1>&2
- echo " n_partitions=16 sh `basename $0` {dir} {shelfaddress}" 1>&2
- exit 1
-fi
-n_partitions=${n_partitions:-16}
-dir=$1
-shelf=$2
-nslots=16
-maxslot=`echo $nslots 1 - p | dc`
-MAJOR=152
-
-set -e
-
-minor=`echo $nslots \* $shelf \* $n_partitions | bc`
-endp=`echo $n_partitions - 1 | bc`
-for slot in `seq 0 $maxslot`; do
- for part in `seq 0 $endp`; do
- name=e$shelf.$slot
- test "$part" != "0" && name=${name}p$part
- rm -f $dir/$name
- mknod -m 0660 $dir/$name b $MAJOR $minor
-
- minor=`expr $minor + 1`
- done
-done
diff --git a/Documentation/aoe/status.sh b/Documentation/aoe/status.sh
index 751f3be..eeec7ba 100644
--- a/Documentation/aoe/status.sh
+++ b/Documentation/aoe/status.sh
@@ -1,5 +1,8 @@
#! /bin/sh
# collate and present sysfs information about AoE storage
+#
+# A more complete version of this script is aoe-stat, in the
+# aoetools.
set -e
format="%8s\t%8s\t%8s\n"

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