PowerFlex：如何在 Linux 中將「scini」裝置設為多路徑裝置

步驟

1. 重新命名 60-scini.rules 檔，如下所示： 

   mv /etc/udev/rules.d/60-scini.rules /etc/udev/rules.d/20-scini.rules

2. 編輯 /etc/udev/rules.d/20-scini.rules 並將其所有內容替換為以下內容：

   1. Red Hat Enterprise Linux：

      KERNEL=="scini*[!0-9]", SUBSYSTEM=="block", PROGRAM="/bin/emc/scaleio/drv_cfg --query_block_device_id --block_device $tempnode", SYMLINK+="disk/by-id/emc-vol-%c", ENV{ID_BUS}="scsi", ENV{ID_SERIAL}="%c"
      KERNEL=="scini*[0-9]", SUBSYSTEM=="block", PROGRAM="/bin/emc/scaleio/drv_cfg --query_block_device_id --block_device $tempnode", SYMLINK+="disk/by-id/emc-vol-%c-part%n"
      ACTION=="add", DEVPATH=="*scini*[!0-9]", RUN+="/bin/sh -c 'echo noop > /sys$DEVPATH/queue/scheduler'"
      ACTION=="add", DEVPATH=="*scini*[!0-9]", RUN+="/bin/sh -c 'echo 1024 > /sys$DEVPATH/queue/max_sectors_kb'"
      ACTION=="add", DEVPATH=="*scini*[!0-9]", RUN+="/bin/sh -c 'echo 512 > /sys$DEVPATH/queue/nr_requests'"

      然後，重新啟動”scini」服務：

      適用於 Red Hat Enterprise Linux 6.x：

      service scini restart

      適用於 Red Hat Enterprise Linux 7.x：

      systemctl restart scini

   2. 蘇塞：特別是對於 SLES 12， /etc/udev/rules.d/20-scini.rules 必須符合：

      KERNEL=="scini*[!0-9]", SUBSYSTEM=="block", PROGRAM="/bin/emc/scaleio/drv_cfg --query_block_device_id --block_device $tempnode", SYMLINK+="disk/by-id/emc-vol-%c", ENV{ID_BUS}="scsi", ENV{ID_SERIAL}="%c", ENV{ID_WWN}="%c"
      KERNEL=="scini*[0-9]", SUBSYSTEM=="block", PROGRAM="/bin/emc/scaleio/drv_cfg --query_block_device_id --block_device $tempnode", SYMLINK+="disk/by-id/emc-vol-%c-part%n"
      ACTION=="add", DEVPATH=="*scini*[!0-9]", RUN+="/bin/sh -c 'echo noop > /sys$DEVPATH/queue/scheduler'"
      ACTION=="add", DEVPATH=="*scini*[!0-9]", RUN+="/bin/sh -c 'echo 1024 > /sys$DEVPATH/queue/max_sectors_kb'"
      ACTION=="add", DEVPATH=="*scini*[!0-9]", RUN+="/bin/sh -c 'echo 512 > /sys$DEVPATH/queue/nr_requests'"

      和 /etc/multipath.conf 必須包含：

      retain_attached_hw_handler "no"

      因此，如果 中沒有定義任何其他內容 /etc/mutlipath.conf，它看起來像：

      defaults {
          retain_attached_hw_handler "no"
      }

      啟用並啟動多重路徑：

      systemctl enable multipathd.service
      systemctl start multipathd.service

      確認它已啟動：

      sles12:~ # systemctl status multipathd.service
      ● multipathd.service - Device-Mapper Multipath Device Controller
         Loaded: loaded (/usr/lib/systemd/system/multipathd.service; enabled; vendor preset: disabled)
         Active: active (running) since Sat 2019-05-18 16:15:26 EDT; 2min 8s ago
        Process: 852 ExecStartPre=/sbin/modprobe -a scsi_dh_alua scsi_dh_emc scsi_dh_rdac dm-multipath (code=exited, status=0/SUCCESS)
       Main PID: 856 (multipathd)
         Status: "idle"
          Tasks: 7 (limit: 512)
         CGroup: /system.slice/multipathd.service
                 └─856 /sbin/multipathd -d -s
      
      May 18 16:15:26 sles12 systemd[1]: Starting Device-Mapper Multipath Device Controller...
      May 18 16:15:26 sles12 multipathd[856]: path checkers start up
      May 18 16:15:26 sles12 systemd[1]: Started Device-Mapper Multipath Device Controller.
      May 18 16:15:33 sles12 multipathd[856]: scinia: add path (uevent)
      May 18 16:15:33 sles12 multipathd[856]: 1da395ed13deb1d5-54d2a00700000007: load table [0 33554432 multipath 0 0 1 1 service-time 0 1 1 253:0 1]
      May 18 16:15:33 sles12 multipathd[856]: 1da395ed13deb1d5-54d2a00700000007: event checker started
      May 18 16:15:33 sles12 multipathd[856]: scinia [253:0]: path added to devmap 1da395ed13deb1d5-54d2a00700000007

3. 將 PowerFlex 磁碟區對應到 Linux 機器，執行「multipath -ll“，您現在能夠看到您的”scini」表示為多路徑磁碟的裝置：

   mpathl (20086602f23bbab85df8eb89900000001) dm-10 ,
   size=24G features='0' hwhandler='0' wp=rw
   `-+- policy='round-robin 0' prio=1 status=active
   `- #:#:#:# scinia 252:0 active ready running