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Re: [dm-devel] RH 4 and HSG80



Thanks for the help. Unfortunately, I don't have /sbin/mpath_prio_hp_sw. I have other mpath_prio files but not the hp one. I guess that means I need a newer version of multipath-tools. How can I upgrade to the latest version?

Eric

Stefan Bader wrote:
I have no access to HSGs but maybe this generic statements (plus some wisdom from hwtable.c) helps:

First, you are actually forcing multipath-tools to use all paths by stating "multibus" in you multipath section. Everything you put there will replace the defaults and the device sections. Just be minimalistic there. In the latest multipath-tools code there actually is a configuration for "DEC"/"HSG80". From this, does the following
multipath-conf help you?

defaults {
        rr_min_io                       64
        user_friendly_names     yes
}

multipaths {
        multipath {
                wwid    360001fe1000d85f000039341397602d2
                alias   disk1
        }
        multipath {
                wwid    360001fe1000d85f0000393413976024b
                alias   disk2
        }
}

devices {
        device {
                vendor                  "DEC"
                product                 "HSG80"
                path_grouping_policy    group_by_prio
                prio_callout            "/sbin/mpath_prio_hp_sw /dev/%n"
                hardware_handler                "1 hp_sw"
                path_checker            hp_sw
                no_path_retry           5
        }
        device {
                vendor                  "DEC"
                product                 "HSG80    (C) DEC"
                path_grouping_policy    group_by_prio
                prio_callout            "/sbin/mpath_prio_hp_sw /dev/%n"
                hardware_handler                "1 hp_sw"
                path_checker            hp_sw
                no_path_retry           5
        }
}


Mit freundlichem Gruß / Regards,
Stefan Bader

SW Linux on zSeries Development
Stefan Bader de ibm com

IBM Deutschland Entwicklung GmbH
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dm-devel-bounces redhat com wrote on 01.08.2007 16:53:55:

I trying to setup multipathing with HSG80s on a Redhat 4 update 5 host. I have it mostly working, the problem I'm having is that the 2 disks I've created on the HSGs only go through one controller. I set the preferred path for each disk to use a different controller but dm always

sets them to go through just one. I also can't find a way to move a disk

to the other controller, I thought multipathd -k switch would work but it doesn't. Does anyone have RedHat4 and HSG80s working properly with multipathing? Here is my multipath.conf file and multipath -ll output:

defaults {
        user_friendly_names yes
}

defaults {
        udev_dir                /dev
        polling_interval        10
        selector                "round-robin 0"
        path_grouping_policy    multibus
        getuid_callout          "/sbin/scsi_id -g -u -s /block/%n"
        prio_callout            /bin/true
        path_checker            readsector0
        rr_min_io               100
        rr_weight               priorities
        failback                immediate
        no_path_retry           fail
        user_friendly_name      yes
        features                "1 queue_if_no_path"
}
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]*"
}

multipaths {
        multipath {
                wwid 360001fe1000d85f000039341397602d2
                alias                   disk1
                path_grouping_policy    multibus
                path_checker            readsector0
                path_selector           "round-robin 0"
                failback                manual
                rr_weight               priorities
                no_path_retry           5
        }
        multipath {
                wwid 360001fe1000d85f0000393413976024b
                alias                   disk2
                path_grouping_policy    multibus
                path_checker            readsector0
                path_selector           "round-robin 0"
                failback                manual
                rr_weight               priorities
                no_path_retry           5
        }
}
devices {
        device {
                vendor                  DEC
                product                 HSG80
                path_grouping_policy    group_by_serial
getuid_callout "/sbin/scsi_id -g -u -s
/block/%n"
                path_checker            hp_sw
                features                "1 queue_if_no_path"
        }
        device {
                vendor                  DEC
                product                 "HSG80    (C) DEC"
                path_grouping_policy    group_by_serial
getuid_callout "/sbin/scsi_id -g -u -s
/block/%n"
                path_checker            hp_sw
                features                "1 queue_if_no_path"
        }
}

[root lin380g5-ib etc]# multipath -ll
disk2 (360001fe1000d85f0000393413976024b)
[size=339 GB][features="1 queue_if_no_path"][hwhandler="0"]
\_ round-robin 0 [active]
 \_ 0:0:4:11 sdb 8:16  [active][ready]
 \_ 0:0:5:11 sdd 8:48  [active][ghost]
 \_ 1:0:4:11 sdf 8:80  [active][ready]
 \_ 1:0:5:11 sdh 8:112 [active][ghost]

disk1 (360001fe1000d85f000039341397602d2)
[size=67 GB][features="1 queue_if_no_path"][hwhandler="0"]
\_ round-robin 0 [active]
 \_ 0:0:4:20 sda 8:0   [active][ready]
 \_ 0:0:5:20 sdc 8:32  [active][ghost]
 \_ 1:0:4:20 sde 8:64  [active][ready]
 \_ 1:0:5:20 sdg 8:96  [active][ghost]


Thanks

--
Eric Ritchie
Interactive Brokers LLC


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--
Eric Ritchie
Interactive Brokers LLC
203-618-5868


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