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DRBD接続障害 - 技術メモ
ç¾è±¡ãƒ‘ターン１ çªç„¶æ¬¡ã®ã‚ˆã†ãªçŠ¶æ…‹ã«ãªã£ã¦ã—ã¾ã„ã€ã©ã†ã—ã¦ã‚‚相手をèªè˜ã—ãªã„ # cat /proc/drbd version: 8.3.8 (api:88/proto:86-94) GIT-hash: d78846e52224fd00562f7c225bcc25b2d422321d build by mockbuild@builder10.centos.org, 2010-06-04 08:04:16 0: cs:StandAlone ro:Secondary/Unknown ds:UpToDate/DUnknown r---- ns:0 nr:0 dw:0 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:b oos:12ãã‚“ãªã¨ãã€DRBD+Keepalived+iscsi　障害　復旧 - メモã«å¾“ã„ [root@z151 ~]# drbdadm
drbd.conf
ストレージã«ã¯å¯¿å‘½ãŒã‚ã‚Šã€ä¿å˜ã•ã‚ŒãŸæƒ…å ±ã¯æ°¸é ã«æ£å¸¸æ€§ã‚’ä¿è¨¼ã•ã‚Œã‚‹ã‚ã‘ã§ã¯ã‚ã‚Šã¾ã›ã‚“。ãã®ç‚ºã«åˆ¥ã®ã‚¹ãƒˆãƒ¬ãƒ¼ã‚¸ã«ãƒ‡ãƒ¼ã‚¿ã‚’ãƒãƒƒã‚¯ã‚¢ãƒƒãƒ—ã—ãŸã‚Šã€ã‚¹ãƒˆãƒ¬ãƒ¼ã‚¸ãã®ã‚‚ã®ã‚’多é‡åŒ–ã—ã¦ãƒ‡ãƒ¼ã‚¿ã‚’ä¿è·ã™ã‚‹ã“ã¨ãŒé‡è¦ã§ã™ã€‚今回紹介ã™ã‚‹ã¯ã€ã‚¹ãƒˆãƒ¬ãƒ¼ã‚¸ãƒ‡ãƒã‚¤ã‚¹ã‚’多é‡åŒ–ã—ã€ãƒ‡ãƒ¼ã‚¿ã‚’複数ã®ã‚¹ãƒˆãƒ¬ãƒ¼ã‚¸ã«ä¿å˜ã™ã‚‹ä»•çµ„ã¿ã§ã€DRBD(Distributed Replicated Block Device)ã¨å‘¼ã°ã‚Œã¦ã„ã‚‹ã‚‚ã®ã§ã™ã€‚åŒæ§˜ã®ä»•çµ„ã¿ã«ã‚½ãƒ•ãƒˆã‚¦ã‚§ã‚¢ï¼ãƒãƒ¼ãƒ‰ã‚¦ã‚§ã‚¢RAIDãŒã‚ã‚Šã¾ã™ã€‚ DRBD(Distributed Replicated Block Device)ã¨ã¯ã€TCP/IPãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã‚’通ã˜ã¦è¤‡æ•°ã®ã‚µãƒ¼ãƒã®ã‚¹ãƒˆãƒ¬ãƒ¼ã‚¸ï¼ˆãƒ‘ーティション）をリアルタイムã«ãƒŸãƒ©ãƒ¼ãƒªãƒ³ã‚°ï¼ˆè¤‡è£½ï¼‰ã™ã‚‹ã‚½ãƒ•ãƒˆã‚¦ã‚§ã‚¢ã§ã™ã€‚RAID1ã®ã‚ˆã†ãªãƒŸãƒ©ãƒ¼ãƒ‡ã‚£ã‚¹ã‚¯ã‚’構築ã™ã‚‹ã“ã¨ãŒã§ãã¾ã™ã€‚ソフトウェアï¼ãƒãƒ¼ãƒ‰ã‚¦ã‚§ã‚¢RAIDã¯åŒã˜ã‚µãƒ¼ãƒå†…ã®ã‚¹ãƒˆãƒ¬ãƒ¼ã‚¸ã‚’使
2008-07-13 - ãµãŸã¤ã®å·ã†ã‚‹ãŠã†æ—¥è¨˜
DRBDã¨ã‚¯ãƒ©ã‚¹ã‚¿ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã®ãƒ†ã‚¹ãƒˆã§æ‰‹è©°ã¾ã‚Šä¸ã§æ›¸ã„ãŸDRBD (Primary/Primary)ã§æ§‹æˆã—ãŸ2ノードã®ã†ã¡ã€1ノードè½ã¨ã™ã¨ã‚‚ã†1ノードã§GFS2é ˜åŸŸã«ã‚¢ã‚¯ã‚»ã‚¹ã§ããªããªã‚‹ã®ã¯ã€ã‚³ãƒ¡ãƒ³ãƒˆã«ã‚ã‚‹RAã•ã‚“ã®æƒ…å ±ã‚’ã‚‚ã¨ã«Quorumをよã調ã¹ã‚‹ã“ã¨ã§è§£æ±ºã—ã¾ã—ãŸã€‚ Red Hat Cluster Suite(GFS/GFS2ã¯ã“ã®ä¸€éƒ¨)ã§ã¯ã€Quorumを次ã®å¼ã§æ±ºå®šã—ã€ã“ã®æ•°å—よりå°ã•ã„ノード数ã«ãªã‚‹ã¨ã‚µãƒ¼ãƒ“スãŒåœæ¢ã™ã‚‹ä½œã‚Šã«ãªã£ã¦ã„ã¾ã™ã€‚ Quorum = 稼åƒã—ã¦ã„ãŸãƒŽãƒ¼ãƒ‰å°æ•° / 2 + 1 具体的ãªæ•°å—を書ãã¨æ¬¡ã®ã¨ãŠã‚Šã€‚ 6å°æ§‹æˆ: 6/2+1 = 4å°ä»¥ä¸Šç¨¼åƒã—続ã‘ã¦ã„ã‚Œã°OKã€3å°ä»¥ä¸‹ã«ãªã£ãŸã‚‰ã‚¢ã‚¦ãƒˆ 3å°æ§‹æˆ: 3/2+1 = 2å°ä»¥ä¸Šç¨¼åƒã—続ã‘ã¦ã„ã‚Œã°OKã€1å°ä»¥ä¸‹ã«ãªã£ãŸã‚‰ã‚¢ã‚¦ãƒˆ ã“ã“ã§ä»Šå›žã‚„ã£ã¦ã„ãŸDRBDã®å ´åˆã€2å°æ§‹æˆãªã®ã§æ¬¡ã®ã‚ˆã†ã«ãªã‚Šã¾ã™ã€‚
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