Instalar os pacotes abaixo:
# aptitude install multipath-tools-boot multipath-tools firmware-qlogic firmware-bnx2 sysfsutils
# reboot
Criar o arquivo multipath.conf com o conteudo abaixo:
###############################################################################
# Multipath.conf file for IBM Storage
# IMPORTANT: If you change multipath.conf settings after the DM MPIO devices
# have already been configured, be sure to rerun "multipath".
###############################################################################
#
#
# defaults:
#
# polling_interval : The interval between two path checks in seconds.
#
# failback : The failback policy should be set to "immediate"
# to have automatic failback, i.e. if a higher
# priority path that previously failed is restored,
# I/O automatically and immediately fails back to
# the preferred path.
#
# no_path_retry : Use this setting in order to deal with transient
# total path failure scenarios. Indicates that the if
# all paths are failed for 10 checks (iterations of
# the checkerloop) then will set the device to
# .fail_if_no_path. so that I/O will not stay queued
# forever and I/O errors are returned back to the
# application. This value should be adjusted based on
# the value of the polling_interval. Basically, with a
# larger polling_interval, this means that the amount
# of time of allowed total path failure will be
# longer, since the tolerance time is
# (no_path_retry * polling_interval) seconds.
# SHOULD NOT BE USED WITH .features..
#
# rr_min_io : The number of IOs to route to a path before switching
# to the next path in the same path group
#
# path_checker : The default 'readsector0' path checker uses SCSI
# READ (opcode 0x28) which doesn't work in clustered
# environments. TUR (Test Unit Ready) does work in
# clustered environments with storage that subscribes
# to the SCSI-3 spec.
#
# user_friendly_names : With this value set to .yes., DM MPIO devices will
# be named as .mpath0., .mpath1., .mpath2., etc. ...
# The /var/lib/mulitpath/bindings file is
# automatically generated, mapping the .mpathX. name
# to the wwid of the LUN. If set to "no", use the
# WWID as the alias. In either case this be will be
# overriden by any specific aliases in this file.
#
#
defaults {
polling_interval 30
failback immediate
no_path_retry 5
no_path_retry 5
rr_min_io 100
path_checker tur
user_friendly_names yes
}
#
# devices : List of per storage controler settings, overrides default
# settings (device_maps block), overriden by per multipath
# settings (multipaths block)
#
# vendor : Vendor Name
#
# product : Product Name
#
# path_grouping_policy : Path grouping policy to apply to multipath hosted
# by this storage controller
#
# prio_callout : The program and args to callout to obtain a path
# weight. Weights are summed for each path group to
# determine the next PG to use case of failure.
# NOTE: If no callout then all paths have equals weight.
#
#
devices {
device {
vendor "IBM"
product "2810XIV"
selector "round-robin 0"
path_grouping_policy multibus
rr_min_io 15
path_checker tur
failback 15
no_path_retry queue
polling_interval 3
}
}
multipaths {
multipath {
wwid <lun do disco do sistema>
alias system
path_grouping_policy failover
path_selector "round-robin 0"
}
}
devnode_blacklist {
devnode "*"
}
blacklist {
devnode "sda"
}
Após a criação do arquivo, execute os comandos abaixo:
# multipath -F
# /etc/init.d/multipath-tools restart
# multipath -ll
Verifique se foi criado os dispositivos
# ls /dev/mapper/
Após isso devemos atualizar o grub.
# update-initramfs -u
# update-grub
# reboot
