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aoe: update documentation to better reflect aoe-plus-udev usage

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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>
This commit is contained in:
Ed Cashin 2012-10-04 17:16:49 -07:00 committed by Linus Torvalds
parent 1ac9e60262
commit 5b8c4be381
4 changed files with 35 additions and 86 deletions
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49
Documentation/aoe/aoe.txt
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@ -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.

41
Documentation/aoe/mkdevs.sh
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@ -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

28
Documentation/aoe/mkshelf.sh
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@ -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

3
Documentation/aoe/status.sh
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@ -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"