Linux SAN Multipathing (HP Storage)

Instead of installing the original device-mapper-multipath package there is a simillar package from HP called HPDMmultipath-[version].tar.gz that has already a configuration for HP EVA and XP storage devices. The HPDMmultipath-[version].tar.gz can be downloaded from http://www.hp.com -> Software and Drivers -> Enter Linux as Search String.

 # tar -zxvf HPDMmultipath-3.0.0.tar.gz
 # cd HPDMmultipath-3.0.0/RPMS
 # rpm -ivh HPDMmultipath-tools[version]-[Linux-Version]-[ARCH].rpm

 # vim /etc/multipath.conf

defaults {
        udev_dir                /dev
        polling_interval        10
        selector                "round-robin 0"
        path_grouping_policy    failover
        getuid_callout          "/sbin/scsi_id -g -u -s /block/%n"
        prio_callout            "/bin/true"
        path_checker            tur
        rr_min_io               100
        rr_weight               uniform
        failback                immediate
        no_path_retry           12
        user_friendly_names     yes
}

devnode_blacklist {
        devnode         "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
        devnode         "^hd[a-z]"
        devnode         "^cciss!c[0-9]d[0-9]*"
}

devices {

device {
        vendor                  "HP|COMPAQ"
        product                 "HSV1[01]1 \(C\)COMPAQ|HSV2[01]0"
        path_grouping_policy    group_by_prio
        getuid_callout          "/sbin/scsi_id -g -u -s /block/%n"
        path_checker            tur
        path_selector           "round-robin 0"
        prio_callout            "/sbin/mpath_prio_alua /dev/%n"
        rr_weight               uniform
        failback                immediate
        hardware_handler        "0"
        no_path_retry           12
}

device {
        vendor                  "HP"
        product                 "OPEN-.*"
        path_grouping_policy    multibus
        getuid_callout          "/sbin/scsi_id -g -u -s /block/%n"
        path_selector           "round-robin 0"
        rr_weight               uniform
        prio_callout            "/bin/true"
        path_checker            tur
        hardware_handler        "0"
        failback                immediate
        no_path_retry           12
}

}

Show paths to an EVA8000 storage array.

# multipath -ll
mpath0 (3600508b4001054a20001100001c70000)
[size=4.0G][features="1 queue_if_no_path"][hwhandler="0"]
\_ round-robin 0 [prio=200][active]
 \_ 0:0:1:1 sdd 8:48   [active][ready]
 \_ 0:0:3:1 sdj 8:144  [active][ready]
 \_ 1:0:2:1 sds 65:32  [active][ready]
 \_ 1:0:3:1 sdv 65:80  [active][ready]
\_ round-robin 0 [prio=40][enabled]
 \_ 0:0:0:1 sda 8:0    [active][ready]
 \_ 0:0:2:1 sdg 8:96   [active][ready]
 \_ 1:0:0:1 sdm 8:192  [active][ready]
 \_ 1:0:1:1 sdp 8:240  [active][ready]

ProLiant Support Pack (PSP)
While installing PSP from HP, unckeck the HBA failover driver in the installation screen, otherwise a new kernel will be installed and the above installed multipathing driver isn’t working correctly anomymore.