{"id":887,"date":"2012-12-10T15:27:32","date_gmt":"2012-12-10T07:27:32","guid":{"rendered":"http:\/\/www.wdsos.com\/index.php\/2012\/12\/10\/raid%e7%a3%81%e7%9b%98%e9%98%b5%e5%88%97%e6%95%b0%e6%8d%ae%e6%81%a2%e5%a4%8d%e7%9a%84%e5%8e%9f%e7%90%86%e7%ae%80%e4%bb%8b\/"},"modified":"2012-12-10T15:27:32","modified_gmt":"2012-12-10T07:27:32","slug":"raid%e7%a3%81%e7%9b%98%e9%98%b5%e5%88%97%e6%95%b0%e6%8d%ae%e6%81%a2%e5%a4%8d%e7%9a%84%e5%8e%9f%e7%90%86%e7%ae%80%e4%bb%8b","status":"publish","type":"post","link":"http:\/\/www.jointchina.com\/index.php\/uncategorized\/887\/","title":{"rendered":"RAID\u78c1\u76d8\u9635\u5217\u6570\u636e\u6062\u590d\u7684\u539f\u7406\u7b80\u4ecb"},"content":{"rendered":"

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u5982\u4f55\u589e\u52a0\u78c1\u76d8\u7684\u5b58\u53d6(access)\u901f\u5ea6,\u5982\u4f55\u9632\u6b62\u6570\u636e\u56e0\u78c1\u76d8\u7684\u6545\u969c\u800c\u5931\u843d\u53ca\u5982\u4f55\u6709\u6548\u7684\u5229\u7528\u78c1\u76d8\u7a7a\u95f4,\u4e00\u76f4\u662f\u7535\u8111\u4e13\u4e1a\u4eba\u5458\u548c\u7528\u6237\u7684\u56f0\u6270;\u800c\u5927\u5bb9\u91cf\u78c1\u76d8\u7684\u4ef7\u683c\u975e\u5e38\u6602\u8d35,\u5bf9\u7528\u6237\u5f62\u6210\u5f88\u5927\u7684\u8d1f\u62c5\u3002\u78c1\u76d8\u9635\u5217\u6280\u672f\u7684\u4ea7\u751f\u4e00\u4e3e\u89e3\u51b3\u4e86\u8fd9\u4e9b\u95ee\u9898\u3002
\u8fc7\u53bb\u5341\u51e0\u5e74\u6765,CPU\u7684\u5904\u7406\u901f\u5ea6\u589e\u52a0\u4e86\u4e94\u5341\u500d\u6709\u591a,\u5185\u5b58(memory)\u7684\u5b58\u53d6\u901f\u5ea6\u4ea6\u5927\u5e45\u589e\u52a0,\u800c\u6570\u636e\u50a8\u5b58\u88c5\u7f6e–\u4e3b\u8981\u662f\u78c1\u76d8(hard disk)–\u7684\u5b58\u53d6\u901f\u5ea6\u53ea\u589e\u52a0\u4e86\u4e09\u3001\u56db\u500d,\u5f62\u6210\u7535\u8111\u7cfb\u7edf\u7684\u74f6\u9888,\u62c9\u4f4e\u4e86\u7535\u8111\u7cfb\u7edf\u7684\u6574\u4f53\u6027\u80fd(through put),\u82e5\u4e0d\u80fd\u6709\u6548\u7684\u63d0\u5347\u78c1\u76d8\u7684\u5b58\u53d6\u901f\u5ea6,CPU\u3001\u5185\u5b58\u53ca\u78c1\u76d8\u95f4\u7684\u4e0d\u5e73\u8861\u5c06\u4f7fCPU\u53ca\u5185\u5b58\u7684\u6539\u8fdb\u5f62\u6210\u6d6a\u8d39\u3002
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u76ee\u524d\u6539\u8fdb\u78c1\u76d8\u5b58\u53d6\u901f\u5ea6\u7684\u7684\u65b9\u5f0f\u4e3b\u8981\u6709\u4e24\u79cd\u3002\u4e00\u662f\u78c1\u76d8\u5feb\u53d6\u63a7\u5236(disk cache controller),\u5b83\u5c06\u4ece\u78c1\u76d8\u8bfb\u53d6\u7684\u6570\u636e\u5b58\u5728\u5feb\u53d6\u5185\u5b58(cache memory)\u4e2d\u4ee5\u51cf\u5c11\u78c1\u76d8\u5b58\u53d6\u7684\u6b21\u6570,\u6570\u636e\u7684\u8bfb\u5199\u90fd\u5728\u5feb\u53d6\u5185\u5b58\u4e2d\u8fdb\u884c,\u5927\u5e45\u589e\u52a0\u5b58\u53d6\u7684\u901f\u5ea6,\u5982\u8981\u8bfb\u53d6\u7684\u6570\u636e\u4e0d\u5728\u5feb\u53d6\u5185\u5b58\u4e2d,\u6216\u8981\u5199\u6570\u636e\u5230\u78c1\u76d8\u65f6,\u624d\u505a\u78c1\u76d8\u7684\u5b58\u53d6\u52a8\u4f5c\u3002\u8fd9\u79cd\u65b9\u5f0f\u5728\u5355\u5de5\u73af\u5883(single- tasking envioronment)\u5982DOS\u4e4b\u4e0b,\u5bf9\u5927\u91cf\u6570\u636e\u7684\u5b58\u53d6\u6709\u5f88\u597d\u7684\u6027\u80fd(\u91cf\u5c0f\u4e14\u9891\u7e41\u7684\u5b58\u53d6\u5219\u4e0d\u7136),\u4f46\u5728\u591a\u5de5(multi-tasking)\u73af\u5883\u4e4b\u4e0b(\u56e0\u4e3a\u8981\u4e0d\u505c\u7684\u4f5c\u6570\u636e\u4ea4\u6362(swapping) \u7684\u52a8\u4f5c)\u6216\u6570\u636e\u5e93(database)\u7684\u5b58\u53d6(\u56e0\u4e3a\u6bcf\u4e00\u8bb0\u5f55\u90fd\u5f88\u5c0f)\u5c31\u4e0d\u80fd\u663e\u793a\u5176\u6027\u80fd\u3002\u8fd9\u79cd\u65b9\u5f0f\u6ca1\u6709\u4efb\u4f55\u5b89\u5168\u4fdd\u969c\u3002
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u5176\u4e8c\u662f\u4f7f\u7528\u78c1\u76d8\u9635\u5217\u7684\u6280\u672f\u3002\u78c1\u76d8\u9635\u5217\u662f\u628a\u591a\u4e2a\u78c1\u76d8\u7ec4\u6210\u4e00\u4e2a\u9635\u5217,\u5f53\u4f5c\u5355\u4e00\u78c1\u76d8\u4f7f\u7528,\u5b83\u5c06\u6570\u636e\u4ee5\u5206\u6bb5(striping)\u7684\u65b9\u5f0f\u50a8\u5b58\u5728\u4e0d\u540c\u7684\u78c1\u76d8\u4e2d,\u5b58\u53d6\u6570\u636e\u65f6,\u9635\u5217\u4e2d\u7684\u76f8\u5173\u78c1\u76d8\u4e00\u8d77\u52a8\u4f5c,\u5927\u5e45\u51cf\u4f4e\u6570\u636e\u7684\u5b58\u53d6\u65f6\u95f4,\u540c\u65f6\u6709\u66f4\u4f73\u7684\u7a7a\u95f4\u5229\u7528\u7387\u3002\u78c1\u76d8\u9635\u5217\u6240\u5229\u7528\u7684\u4e0d\u540c\u7684\u6280\u672f,\u79f0\u4e3aRAID level,\u4e0d\u540c\u7684level\u9488\u5bf9\u4e0d\u540c\u7684\u7cfb\u7edf\u53ca\u5e94\u7528,\u4ee5\u89e3\u51b3\u6570\u636e\u5b89\u5168
\u7684\u95ee\u9898\u3002
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u4e00\u822c\u9ad8\u6027\u80fd\u7684\u78c1\u76d8\u9635\u5217\u90fd\u662f\u4ee5\u786c\u4ef6\u7684\u5f62\u5f0f\u6765\u8fbe\u6210,\u8fdb\u4e00\u6b65\u7684\u628a\u78c1\u76d8\u5feb\u53d6\u63a7\u5236\u53ca\u78c1\u76d8\u9635\u5217\u7ed3\u5408\u5728\u4e00\u4e2a\u63a7\u5236\u5668(RAID controler\u6216\u63a7\u5236\u5361\u4e0a,\u9488\u5bf9\u4e0d\u540c\u7684\u7528\u6237\u89e3\u51b3\u4eba\u4eec\u5bf9\u78c1\u76d8\u8f93\u51fa\u5165\u7cfb\u7edf\u7684\u56db\u5927\u8981\u6c42:
(1)\u589e\u52a0\u5b58\u53d6\u901f\u5ea6,
(2)\u5bb9\u9519(fault tolerance),\u5373\u5b89\u5168\u6027
(3)\u6709\u6548\u7684\u5229\u7528\u78c1\u76d8\u7a7a\u95f4;
(4)\u5c3d\u91cf\u7684\u5e73\u8861CPU,\u5185\u5b58\u53ca\u78c1\u76d8\u7684\u6027\u80fd\u5dee\u5f02,\u63d0\u9ad8\u7535\u8111\u7684\u6574\u4f53\u5de5\u4f5c\u6027\u80fd\u3002<\/p>\n

2.\u78c1\u76d8\u9635\u5217\u539f\u7406
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u78c1\u76d8\u9635\u5217\u4e2d\u9488\u5bf9\u4e0d\u540c\u7684\u5e94\u7528\u4f7f\u7528\u7684\u4e0d\u540c\u6280\u672f,\u79f0\u4e3aRAID level,RAID\u662fRedundent Array of Inexpensive Disks\u7684\u7f29\u5199,\u800c\u6bcf\u4e00level\u4ee3\u8868\u4e00\u79cd\u6280\u672f,\u76ee\u524d\u4e1a\u754c\u516c\u8ba4\u7684\u6807\u51c6\u662fRAID 0~RAID 5\u3002\u8fd9\u4e2alevel\u5e76\u4e0d\u4ee3\u8868\u6280\u672f\u7684\u9ad8\u4f4e,level 5\u5e76\u4e0d\u9ad8\u4e8elevel 3,level 1\u4e5f\u4e0d\u4f4e\u8fc7level 4,\u81f3\u4e8e\u8981\u9009\u62e9\u90a3\u4e00\u79cdRAID level\u7684\u4ea7\u54c1,\u7eaf\u89c6\u7528\u6237\u7684\u64cd\u4f5c\u73af\u5883(operating environment)\u53ca\u5e94\u7528(application)\u800c\u5b9a,\u4e0elevel\u7684\u9ad8\u4f4e\u6ca1\u6709\u5fc5\u7136\u7684\u5173\u7cfb\u3002
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 RAID 0\u53caRAID 1\u9002\u7528\u4e8ePC\u53caPC\u76f8\u5173\u7684\u7cfb\u7edf\u5982\u5c0f\u578b\u7684\u7f51\u7edc\u670d\u52a1\u5668(network server)\u53ca\u9700\u8981\u9ad8\u78c1\u76d8\u5bb9\u91cf\u4e0e\u5feb\u901f\u78c1\u76d8\u5b58\u53d6\u7684\u5de5\u4f5c\u7ad9\u7b49,\u6bd4\u8f83\u4fbf\u5b9c;RAID 3\u53caRAID 4\u9002\u7528\u4e8e\u5927\u578b\u7535\u8111\u53ca\u5f71\u50cf\u3001CAD\/CAM\u7b49\u5904\u7406;RAID 5\u591a\u7528\u4e8eOLTP\uff08\u5728\u7ebf\u4e8b\u52a1\u5904\u7406\uff09,\u56e0\u6709\u91d1\u878d\u673a\u6784\u53ca\u5927\u578b\u6570\u636e\u5904\u7406\u4e2d\u5fc3\u7684\u8feb\u5207\u9700\u8981,\u6545\u4f7f\u7528\u8f83\u591a\u800c\u8f83\u6709\u540d\u6c14, RAID 2\u8f83\u5c11\u4f7f\u7528,\u5176\u4ed6\u5982RAID 6,RAID 7,\u4e43\u81f3RAID 10\u7b49,\u90fd\u662f\u5382\u5546\u5404\u505a\u5404\u7684,\u5e76\u65e0\u4e00\u81f4\u7684\u6807\u51c6,\u5728\u6b64\u4e0d\u4f5c\u8bf4\u660e\u3002\u4ecb\u7ecd\u5404\u4e2aRAID level\u4e4b\u524d, \u5148\u770b\u770b\u5f62\u6210\u78c1\u76d8\u9635\u5217\u7684\u4e24\u4e2a\u57fa\u672c\u6280\u672f:
\u78c1\u76d8\u5ef6\u4f38(Disk Spanning):
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u8bd1\u4e3a\u78c1\u76d8\u5ef6\u4f38,\u80fd\u786e\u5207\u7684\u8868\u793adisk spanning\u8fd9\u79cd\u6280\u672f\u7684\u542b\u4e49\u3002\u5982\u56fe\u78c1\u76d8\u9635\u5217\u63a7\u5236\u5668, \u8054\u63a5\u4e86\u56db\u4e2a\u78c1\u76d8,\u8fd9\u56db\u4e2a\u78c1\u76d8\u5f62\u6210\u4e00\u4e2a\u9635\u5217(array),\u800c\u78c1\u76d8\u9635\u5217\u7684\u63a7\u5236\u5668(RAID controller)\u662f\u5c06\u6b64\u56db\u4e2a\u78c1\u76d8\u89c6\u4e3a\u5355\u4e00\u7684\u78c1\u76d8,\u5982DOS\u73af\u5883\u4e0b\u7684C:\u76d8\u3002\u8fd9\u662fdisk spanning\u7684\u610f\u4e49,\u56e0\u4e3a\u628a\u5c0f\u5bb9\u91cf\u7684\u78c1\u76d8\u5ef6\u4f38\u4e3a\u5927\u5bb9\u91cf\u7684\u5355\u4e00\u78c1\u76d8,\u7528\u6237\u4e0d\u5fc5\u89c4\u5212\u6570\u636e\u5728\u5404\u78c1\u76d8\u7684\u5206\u5e03,\u800c\u4e14\u63d0\u9ad8\u4e86\u78c1\u76d8\u7a7a\u95f4\u7684\u4f7f\u7528\u7387\u3002\u5e76\u4f7f\u78c1\u76d8\u5bb9\u91cf\u51e0\u4e4e\u53ef\u4f5c\u65e0\u9650\u7684\u5ef6\u4f38;\u800c\u5404\u4e2a\u78c1\u76d8\u4e00\u8d77\u4f5c\u53d6\u5b58\u7684\u52a8\u4f5c,\u6bd4\u5355\u4e00\u78c1\u76d8\u66f4\u4e3a\u5feb\u6377\u3002\u5f88\u660e\u663e\u7684,\u6709\u6b64\u9635\u5217\u7684\u5f62\u6210\u800c\u4ea7\u751fRAID\u7684\u5404\u79cd\u6280\u672f\u3002
\u78c1\u76d8\u6216\u6570\u636e\u5206\u6bb5(Disk Striping or Data Striping):
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u56e0\u4e3a\u78c1\u76d8\u9635\u5217\u662f\u5c06\u540c\u4e00\u9635\u5217\u7684\u591a\u4e2a\u78c1\u76d8\u89c6\u4e3a\u5355\u4e00\u7684\u865a\u62df\u78c1\u76d8(virtual disk),\u6240\u4ee5\u5176\u6570\u636e\u662f\u4ee5\u5206\u6bb5(block or segment)\u7684\u65b9\u5f0f\u987a\u5e8f\u5b58\u653e\u5728\u78c1\u76d8\u9635\u5217\u4e2d,\u6570\u636e\u6309\u9700\u8981\u5206\u6bb5,\u4ece\u7b2c\u4e00\u4e2a\u78c1\u76d8\u5f00\u59cb\u653e,\u653e\u5230\u8f83\u5f8c\u4e00\u4e2a\u78c1\u76d8\u518d\u56de\u5230\u7b2c\u4e00\u4e2a\u78c1\u76d8\u653e\u8d77,\u76f4\u5230\u6570\u636e\u5206\u5e03\u5b8c\u6bd5\u3002\u81f3\u4e8e\u5206\u6bb5\u7684\u5927\u5c0f\u89c6\u7cfb\u7edf\u800c\u5b9a,\u6709\u7684\u7cfb\u7edf\u6216\u4ee51KB\u8f83\u6709\u6548\u7387,\u6216\u4ee54KB,\u6216\u4ee56KB,\u751a\u81f3\u662f4MB\u62168MB\u7684,\u4f46\u9664\u975e\u6570\u636e\u5c0f\u4e8e\u4e00\u4e2a\u6247\u533a(sector,\u5373512bytes),\u5426\u5219\u5176\u5206\u6bb5\u5e94\u662f512byte\u7684\u500d\u6570\u3002\u56e0\u4e3a\u78c1\u76d8\u7684\u8bfb\u5199\u662f\u4ee5\u4e00\u4e2a\u6247\u533a\u4e3a\u5355\u4f4d,\u82e5\u6570\u636e\u5c0f\u4e8e512bytes,\u7cfb\u7edf\u8bfb\u53d6\u8be5\u6247\u533a\u540e,\u8fd8\u8981\u505a\u7ec4\u5408\u6216\u5206\u7ec4(\u89c6\u8bfb\u6216\u5199\u800c\u5b9a)\u7684\u52a8\u4f5c,\u6d6a\u8d39\u65f6\u95f4\u3002\u4ece\u4e0a\u56fe\u6211\u4eec\u53ef\u4ee5\u770b\u51fa,\u6570\u636e\u4ee5\u5206\u6bb5\u4e8e\u5728\u4e0d\u540c\u7684\u78c1\u76d8,\u6574\u4e2a\u9635\u5217\u7684\u5404\u4e2a\u78c1\u76d8\u53ef\u540c\u65f6\u4f5c\u8bfb\u5199,\u6545\u6570\u636e\u5206\u6bb5\u4f7f\u6570\u636e\u7684\u5b58\u53d6\u6709\u8f83\u597d\u7684\u6548\u7387,\u7406\u8bba\u4e0a\u672c\u6765\u8bfb\u4e00\u4e2a\u5305\u542b\u56db\u4e2a\u5206\u6bb5\u7684\u6570\u636e\u6240\u9700\u8981\u7684\u65f6\u95f4\u7ea6=(\u78c1\u76d8\u7684access time+\u6570\u636e\u7684tranfer time)X4\u6b21,\u73b0\u5728\u53ea\u8981\u4e00\u6b21\u5c31\u53ef\u4ee5\u5b8c\u6210\u3002<\/p>\n

\u00a0<\/p>\n

\u897f\u6570\u79d1\u6280: \u53f8\u6cd5\u9274\u5b9a\/\u4ea7\u54c1\u8d28\u91cf\u9274\u5b9a\/\u68c0\u9a8c\u68c0\u6d4b\/\u6570\u636e\u6062\u590d\u4e13\u5bb6. 4006184118<\/p>\n\n\n

\n
\"RAID\u78c1\u76d8\u9635\u5217\u6570\u636e\u6062\u590d\u7684\u539f\u7406\u7b80\u4ecb\u63d2\u56fe\"<\/figure>\n\n\n\n
\"RAID\u78c1\u76d8\u9635\u5217\u6570\u636e\u6062\u590d\u7684\u539f\u7406\u7b80\u4ecb\u63d2\u56fe1\"<\/figure>\n\n\n\n
\"RAID\u78c1\u76d8\u9635\u5217\u6570\u636e\u6062\u590d\u7684\u539f\u7406\u7b80\u4ecb\u63d2\u56fe2\"<\/figure>\n<\/figure>\n","protected":false},"excerpt":{"rendered":"

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