linux 儲存多路徑軟體

gxlineji發表於2016-09-06
Linux
redhat linux儲存多路徑，目前我瞭解的有兩種方式：
（1）EMC powerpath
(2) HP securepath (沒用過不做介紹)
（3）device-mapper-multipath

EMC powerpath

 優勢在於能夠實現負載均衡，而其他廠家僅支援基本故障切換。 
 但要註冊，如果不註冊，只有基本的failover功能，沒有負責均衡功能,每次重啟都要 powermt config  來使多路徑生效。
備註： CLARiiON AX 系列陣列自動識別，不需要許可證註冊

以下是一整套 PowerPath 文件集；所有手冊均由 EMC Corporation 提供，
可以自己去百度或EMC官方網找：
◆PowerPath Product Guide
◆PowerPath Quick Reference
◆PowerPath for AIX Installation and Administration Guide
◆PowerPath for HP-UX Installation and Administration Guide
◆《PowerPath for Linux 安裝指南》
◆PowerPath for Solaris Installation and Administration Guide
◆《PowerPath for Windows 安裝和管理指南》
◆EMC PowerPath for AIX Release Notes
◆EMC PowerPath for HP-UX Release Notes
◆EMC PowerPath for Solaris Release Notes
◆EMC PowerPath for Linux Release Notes
◆EMC PowerPath for Windows Release Notes


device-mapper-multipath

  linux 自帶的多路徑軟體
yum install -y device-mapper device-mapper-multipath
cp /usr/share/doc/device-mapper-multipath-0.4.9/multipath.conf /etc/

/etc/multipath.conf 建議配置檔案：

點選(此處)摺疊或開啟

  1. # This is a basic configuration file with some examples, for device mapper
  2. # multipath.
  3. # For a complete list of the default configuration values, see
  4. # /usr/share/doc/device-mapper-multipath-0.4.9/multipath.conf.defaults
  5. # For a list of configuration options with descriptions, see
  6. # /usr/share/doc/device-mapper-multipath-0.4.9/multipath.conf.annotated
  7. #
  8. # REMEMBER: After updating multipath.conf, you must run
  9. #
  10. # service multipathd reload
  11. #
  12. # for the changes to take effect in multipathd
  14. ## By default, devices with vendor = "IBM" and product = "S/390.*" are
  15. ## blacklisted. To enable mulitpathing on these devies, uncomment the
  16. ## following lines.
  17. #blacklist_exceptions {
  18. # device {
  19. # vendor "IBM"
  20. # product "S/390.*"
  21. # }
  22. #}
  24. ## Use user friendly names, instead of using WWIDs as names.
  25. defaults {
  26. user_friendly_names yes
  27. }
  28. ##
  29. ## Here is an example of how to configure some standard options.
  30. ##
  31. #
  32. #defaults {
  33. # udev_dir /dev
  34. # polling_interval 10
  35. # path_selector "round-robin 0"
  36. # path_grouping_policy multibus
  37. # getuid_callout "/lib/udev/scsi_id --whitelisted --device=/dev/%n"
  38. # prio alua
  39. # path_checker readsector0
  40. # rr_min_io 100
  41. # max_fds 8192
  42. # rr_weight priorities
  43. # failback immediate
  44. # no_path_retry fail
  45. # user_friendly_names yes
  46. #}
  47. ##
  48. ## The wwid line in the following blacklist section is shown as an example
  49. ## of how to blacklist devices by wwid. The 2 devnode lines are the
  50. ## compiled in default blacklist. If you want to blacklist entire types
  51. ## of devices, such as all scsi devices, you should use a devnode line.
  52. ## However, if you want to blacklist specific devices, you should use
  53. ## a wwid line. Since there is no guarantee that a specific device will
  54. ## not change names on reboot (from /dev/sda to /dev/sdb for example)
  55. ## devnode lines are not recommended for blacklisting specific devices.
  56. ##
  57. #blacklist {
  58. # wwid 26353900f02796769
  59. # devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
  60. # devnode "^hd[a-z]"
  61. #}
  62. blacklist {
  63. devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
  64. devnode "^hd[a-z]"
  65. devnode "^cciss!c[0-9]d[0-9]*"
  66. }
  68. #multipaths {
  69. # multipath {
  70. # wwid 3600508b4000156d700012000000b0000
  71. # alias yellow
  72. # path_grouping_policy multibus
  73. # path_checker readsector0
  74. # path_selector "round-robin 0"
  75. # failback manual
  76. # rr_weight priorities
  77. # no_path_retry 5
  78. # }
  79. # multipath {
  80. # wwid 1DEC_____321816758474
  81. # alias red
  82. # }
  83. #}
  84. devices {
  85. # device {
  86. # vendor "COMPAQ "
  87. # product "HSV110 (C)COMPAQ"
  88. # path_grouping_policy multibus
  89. # getuid_callout "/lib/udev/scsi_id --whitelisted --device=/dev/%n"
  90. # path_checker readsector0
  91. # path_selector "round-robin 0"
  92. # hardware_handler "0"
  93. # failback 15
  94. # rr_weight priorities
  95. # no_path_retry queue
  96. # }
  97. # device {
  98. # vendor "COMPAQ "
  99. # product "MSA1000 "
  100. # path_grouping_policy multibus
  101. # }
  102. # Device attributed for EMC CLARiiON and VNX series ALUA
  103. device {
  104. vendor "DGC"
  105. product "*"
  106. prio_callout "/sbin/mpath_prio_alua /dev/%n"
  107. path_grouping_policy group_by_prio
  108. features "1 queue_if_no_path"
  109. failback immediate
  110. hardware_handler "1 alua"
  111. }
  112. }


service multipathd start
chkconfig multipathd on

備註：
檢視HBA卡：
cat /sys/class/fc_host/host*/node_name 

重新掃描
echo "1" > /sys/class/fc_host/host1/issue_lip
echo "- - -" > /sys/class/scsi_host/host1/scan

來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/10995764/viewspace-2124556/，如需轉載，請註明出處，否則將追究法律責任。

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