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storage:legacy [2021/03/08 14:29] (current) – created - external edit 127.0.0.1
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 +====== Multipath ======
  
 +<code>
 +yum install device-mapper-multipath
 +</code>
 +
 +===== Mapping point =====
 +
 +<code>/dev/mapper/mpathN</code>
 +
 +===== Initialize multipath.conf =====
 +<code>mpathconf --enable --user_friendly_names y</code>
 +
 +===== Default Blacklist =====
 +
 +<code>
 +blacklist {     
 +  devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"     
 + }
 +</code>
 +
 +===== Block devices under two paths =====
 +<code>
 +defaults {
 +...
 +        find_multipaths yes
 +...
 +}
 +</code>
 +
 +===== ORACLE DB =====
 +<code>rescan-scsi-bus.sh</code>
 +<code>cd /dev/disk/by-id/
 +ls -lthr</code>
 +
 +grep scsi-xxxxxxxxxxxxxxxxxxx-part1
 +
 +<code>
 +devices {
 +    device {
 +    vendor "COMPELNT"
 +    product "Compellent Vol"
 +    features "0"
 +    hardware_handler "0"
 +    prio "const"
 +    no_path_retry 24
 +    path_grouping_policy "multibus"
 +    path_checker "tur"
 +    failback immediate
 +    rr_weight "uniform"
 +    fast_io_fail_tmo 5
 +    dev_loss_tmo infinity
 +    path_selector "round-robin 0"
 +    }
 +}
 +
 +multipaths {
 +    multipath {
 +    wwid 36000d310042cbc000000000000000004
 +    alias  DATA_01
 +    features "1 queue_if_no_path"
 +    }
 +}
 +
 +defaults {
 +    no_path_retry    fail
 +    find_multipaths yes
 +    user_friendly_names yes
 +    polling_interval 5
 +}
 +</code>
 +DATA_01 should be ASM name
 +===== Multipath info =====
 +<code>multipath -ll</code>
 +<code>
 +mpatha (36000d310042cbc000000000000000004) dm-2 COMPELNT,Compellent Vol
 +size=500G features='1 queue_if_no_path' hwhandler='0' wp=rw
 +`-+- policy='service-time 0' prio=1 status=active
 +  |- 7:0:0: sdb 8:16 active ready running
 +  |- 7:0:2: sdc 8:32 active ready running
 +  |- 16:0:0:1 sdd 8:48 active ready running
 +  `- 16:0:2:1 sde 8:64 active ready running
 +</code>
storage/legacy.txt · Last modified: 2021/03/08 14:29 by 127.0.0.1