Attachment 290584 Details for Bug 409741 – multipath.conf

multipath.conf

multipath.conf (text/plain), 6.79 KB, created by Barrett Wendt on 2007-12-31 16:03:22 UTC

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Creator: Barrett Wendt

Created: 2007-12-31 16:03:22 UTC

Size: 6.79 KB

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obsolete

>##################################################################
># Multipath.conf file for IBM Storage 
>#
># Version 1.02
>#
># Please refer to the default "multipath.conf.annotated" file, which
># comes with the SLES10 DM MPIO package, for other setting parameters.
># The annotated file can be found at /usr/share/doc/packages/multipath-tools.
>#
># 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
>        rr_min_io           100
>        path_checker        tur
>        user_friendly_names yes 
>}
>
>#
># An example of blacklisting a local SCSI disk.
># Here a local disk with wwid SIBM-ESXSMAN3184MC_FUFR9P29044K2 is 
># blacklisted and will not appear when "multipath -l(l)" is invoked.
>#
>#
>#blacklist {
>#       wwid SIBM-ESXSMAN3184MC_FUFR9P29044K2
>#}
>
>#
># An example of using an alias. 
># NOTE: this will override the "user_friendly_name" for this LUN.
>#
># Here a LUN from IBM storage with wwid 3600507630efffe32000000000000120a
># is given an alias of "IBM-1750" and will appear as "IBM-1750 
>#(3600507630efffe32000000000000120a)", when "multipath -l(l)" is invoked.
>#
>#
>#multipaths {
>#       multipath {
>#               wwid 3600507630efffe32000000000000120a
>#               alias IBM-1750
>#       }
>#}
>
>#
>#  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 {
># DS6000 
>#       device {
>#               vendor                   "IBM"
>#               product                  "1750500"
>#               path_grouping_policy     group_by_prio
>#               prio_callout             "/sbin/mpath_prio_alua /dev/%n"
>#       }
># DS8000
>#       device {
>#               vendor                   "IBM"
>#               product                  "2107900"
>#               path_grouping_policy     group_by_serial
>#       }
># ESS 800
>       device {
>               vendor                   "IBM"
>               product                  "2105800"
>               path_grouping_policy     group_by_serial
>       }
>}
>devices {
># DS8000
>       device {
>               vendor                   "IBM"
>               product                  "2107900"
>               path_grouping_policy     group_by_serial
>               polling_interval    30 
>               failback            immediate
>               no_path_retry       5
>               rr_min_io           100
>               path_checker        tur
>               user_friendly_names yes 
>       }
>}
>devices {      
>        device {
>                vendor "HP"
>                product "HSV210"
>                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 %n"
>                rr_weight uniform
>                rr_min_io 100
>                failback immediate
>                no_path_retry 60
>        }
>devices {
>        device {
>                vendor                  "DGC"
>                product                 "*"
>                path_grouping_policy    group_by_prio
>                getuid_callout          "/sbin/scsi_id -g -u -s /block/%n"
>                prio_callout            "/sbin/mpath_prio_emc /dev/%n"
>                path_checker            emc_clariion
>                path_selector           "round-robin 0"
>                features                "1 queue_if_no_path"
>                no_path_retry           300
>                hardware_handler        "1 emc"
>                failback                immediate
>        }
>}

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