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Building the multipath test driver module:
For a 2.6 kernel:
cd /usr/src/linux-2.6.0/
cp /usr/src/evms-2.2.1/tests/mpdev/2.6/*.[ch] drivers/block/
patch -p1 < /usr/src/evms-2.2.1/tests/mpdev/2.6/Makefile.patch
make
make modules_install
For a 2.4 kernel:
cd /usr/src/linux-2.4.24/
cp /usr/src/evms-2.2.1/tests/mpdev/2.4/*.[ch] drivers/block/
patch -p1 < /usr/src/evms-2.2.1/tests/mpdev/2.4/Makefile.patch
make dep
make modules
make modules_install
General stuff:
mpdev is a RAM-disk block device...
mknod /dev/mpa b 252 0
mknod /dev/mpb b 252 1
mknod /dev/mpc b 252 2
modprobe mpdev
module paramaters:
major: desired major number for the driver. Default = 252
paths: number of multipaths to activate. Default = 16.
size: size in kB of the ram-disk. Default = 1024.
Edit /etc/evms.conf ... change legacy section ... include {mpa mpb mpc hd? ...}
How to fail and recover a device ...
mp fail /dev/mpa
mp recover /dev/mpa
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