\u7b80\u4ecb<\/strong><\/div>\n
RAID\u5168\u79f0\u4e3a\u72ec\u7acb\u78c1\u76d8\u5197\u4f59\u9635\u5217(Rdeundant Array of Independent Disks),\u57fa\u672c\u601d\u60f3\u5c31\u662f\u628a \u591a\u4e2a\u76f8\u5bf9\u4fbf\u5b9c\u7684\u786c\u76d8\u7ec4\u5408\u8d77\u6765\uff0c\u6210\u4e3a\u4e00\u4e2a\u786c\u76d8\u9635\u5217\u7ec4\uff0c\u4f7f\u6027\u80fd\u8fbe\u5230\u751a\u81f3\u8d85\u8fc7\u4e00\u4e2a\u4ef7\u683c\u6602\u8d35\u3001 \u5bb9\u91cf\u5de8\u5927\u7684\u786c\u76d8\u3002RAID\u901a\u5e38\u88ab\u7528\u5728\u670d\u52a1\u5668\u7535\u8111\u4e0a\uff0c\u4f7f\u7528\u5b8c\u5168\u76f8\u540c\u7684\u786c\u76d8\u7ec4\u6210\u4e00\u4e2a\u903b\u8f91\u6247\u533a, \u56e0\u6b64\u64cd\u4f5c\u7cfb\u7edf\u53ea\u4f1a\u628a\u5b83\u5f53\u505a\u4e00\u4e2a\u786c\u76d8\u3002<\/p>\n
RAID\u5206\u4e3a\u4e0d\u540c\u7684\u7b49\u7ea7\uff0c\u5404\u4e2a\u4e0d\u540c\u7684\u7b49\u7ea7\u5747\u5728\u6570\u636e\u53ef\u9760\u6027\u53ca\u8bfb\u5199\u6027\u80fd\u4e0a\u505a\u4e86\u4e0d\u540c\u7684\u6743\u8861\u3002 \u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u53ef\u4ee5\u4f9d\u636e\u81ea\u5df1\u7684\u5b9e\u9645\u9700\u6c42\u9009\u62e9\u4e0d\u540c\u7684RAID\u65b9\u6848\u3002<\/p>\n
$\"\u57fa\u7840$ <\/p>\n
\u6807\u51c6RAID<\/strong><\/div>\n
RAID 0<\/strong><\/span><\/div>\n
RAID0\u79f0\u4e3a\u6761\u5e26\u5316(Striping)\u5b58\u50a8,\u5c06\u6570\u636e\u5206\u6bb5\u5b58\u50a8\u4e8e \u5404\u4e2a\u78c1\u76d8\u4e2d\uff0c\u8bfb\u5199\u5747\u53ef\u4ee5\u5e76\u884c\u5904\u7406\u3002\u56e0\u6b64\u5176\u8bfb\u5199\u901f\u7387\u4e3a\u5355\u4e2a\u78c1\u76d8\u7684N\u500d(N\u4e3a\u7ec4\u6210RAID0\u7684\u78c1\u76d8\u4e2a\u6570)\uff0c\u4f46\u662f\u5374\u6ca1\u6709\u6570 \u636e\u5197\u4f59\uff0c\u5355\u4e2a\u78c1\u76d8\u7684\u635f\u574f\u4f1a\u5bfc\u81f4\u6570\u636e\u7684\u4e0d\u53ef\u4fee\u590d\u3002<\/p>\n
$\"\u57fa\u7840$
\n\u5927\u591a\u6570striping\u7684\u5b9e\u73b0\u5141\u8bb8\u7ba1\u7406\u8005\u901a\u8fc7\u8c03\u8282\u4e24\u4e2a\u5173\u952e\u7684\u53c2\u6570\u6765\u5b9a\u4e49\u6570\u636e\u5206\u6bb5\u53ca\u5199\u5165\u78c1\u76d8\u7684 \u65b9\u5f0f,\u8fd9\u4e24\u4e2a\u53c2\u6570\u5bf9RAID0\u7684\u6027\u80fd\u6709\u5f88\u91cd\u8981\u7684\u5f71\u54cd\u3002
\nSTRIPE WIDTH<\/strong>
\nstripe width\u662f\u6307\u53ef\u88ab\u5e76\u884c\u5199\u5165\u7684 stripe \u7684\u4e2a\u6570,\u5373\u7b49\u4e8e\u78c1\u76d8\u9635\u5217\u4e2d\u78c1\u76d8\u7684\u4e2a\u6570\u3002
\nSTRIPE SIZE<\/strong>
\n\u4e5f\u53ef\u79f0\u4e3a\u00a0block size(chunk size,stripe length,granularity)\uff0c\u6307\u5199\u5165\u6bcf\u4e2a\u78c1 \u76d8\u7684\u6570\u636e\u5757\u5927\u5c0f\u3002\u4ee5\u5757\u5206\u6bb5\u7684RAID\u901a\u5e38\u53ef\u5141\u8bb8\u9009\u62e9\u7684\u5757\u5927\u5c0f\u4ece 2KB \u5230 512KB\u4e0d\u7b49\uff0c\u4e5f\u6709\u66f4 \u9ad8\u7684\uff0c\u4f46\u4e00\u5b9a\u8981\u662f2\u7684\u6307\u6570\u500d\u3002\u4ee5\u5b57\u8282\u5206\u6bb5\u7684(\u6bd4\u5982RAID3)\u4e00\u822c\u7684stripe size\u4e3a1\u5b57\u8282\u6216\u8005 512\u5b57\u8282\uff0c\u5e76\u4e14\u7528\u6237\u4e0d\u80fd\u8c03\u6574\u3002<\/p>\n
stripe size\u5bf9\u6027\u80fd\u7684\u5f71\u54cd\u662f\u5f88\u96be\u7b80\u5355\u4f30\u91cf\u7684\uff0c\u6700\u597d\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\u4f9d\u81ea\u5df1\u9700\u6c42\u591a\u591a\u8c03\u6574\u5e76 \u89c2\u5bdf\u5176\u5f71\u54cd\u3002\u901a\u5e38\u6765\u8bf4\uff0c\u51cf\u5c11stripe size,\u6587\u4ef6\u4f1a\u88ab\u5206\u6210\u66f4\u5c0f\u7684\u5757\uff0c\u4f20\u8f93\u6570\u636e\u4f1a\u66f4\u5feb\uff0c\u4f46 \u662f\u5374\u9700\u8981\u66f4\u591a\u7684\u78c1\u76d8\u6765\u4fdd\u5b58,\u589e\u52a0positioning performance,\u53cd\u4e4b\u5219\u76f8\u53cd\u3002\u5e94\u8be5\u8bf4\uff0c\u6ca1\u6709 \u4e00\u4e2a\u7406\u8bba\u4e0a\u7684\u6700\u4f18\u7684\u503c\u3002\u5f88\u591a\u65f6\u5019\uff0c\u4e5f\u8981\u8003\u8651\u78c1\u76d8\u63a7\u5236\u5668\u7684\u7b56\u7565,\u6bd4\u5982\u6709\u7684\u78c1\u76d8\u63a7\u5236\u5668\u4f1a\u7b49 \u7b49\u5230\u4e00\u5b9a\u6570\u636e\u91cf\u624d\u5f00\u59cb\u5f80\u78c1\u76d8\u5199\u5165\u3002<\/p>\n
RAID 1<\/strong><\/span><\/div>\n
\u955c\u50cf\u5b58\u50a8(mirroring)\uff0c\u6ca1\u6709\u6570\u636e\u6821\u9a8c\u3002\u6570\u636e\u88ab\u540c\u7b49\u5730\u5199\u5165\u4e24\u4e2a\u6216\u591a\u4e2a\u78c1\u76d8\u4e2d\uff0c\u53ef\u60f3\u800c\u77e5\uff0c\u5199\u5165\u901f\u5ea6\u4f1a\u6bd4\u8f83 \u6162\uff0c\u4f46\u8bfb\u53d6\u901f\u5ea6\u4f1a\u6bd4\u8f83\u5feb\u3002\u8bfb\u53d6\u901f\u5ea6\u53ef\u4ee5\u63a5\u8fd1\u6240\u6709\u78c1\u76d8\u541e\u5410\u91cf\u7684\u603b\u548c,\u5199\u5165\u901f\u5ea6\u53d7\u9650\u4e8e\u6700\u6162 \u7684\u78c1\u76d8\u3002<\/p>\n
RAID1\u4e5f\u662f\u78c1\u76d8\u5229\u7528\u7387\u6700\u4f4e\u7684\u4e00\u4e2a\u3002\u5982\u679c\u7528\u4e24\u4e2a\u4e0d\u540c\u5927\u5c0f\u7684\u78c1\u76d8\u5efa\u7acbRAID1,\u53ef\u4ee5\u7528\u7a7a\u95f4\u8f83\u5c0f\u7684\u90a3\u4e00\u4e2a\uff0c\u8f83\u5927\u7684\u78c1\u76d8\u591a\u51fa\u6765\u7684\u90e8\u5206\u53ef\u4ee5\u4f5c\u4ed6\u7528\uff0c\u4e0d\u4f1a\u6d6a\u8d39\u3002<\/p>\n
$\"\u57fa\u7840$ <\/p>\n
RAID 2<\/strong><\/span><\/div>\n
RAID0\u7684\u6539\u826f\u7248\uff0c\u52a0\u5165\u4e86\u6c49\u660e\u7801(Hanmming Code)\u9519\u8bef\u6821\u9a8c\u3002<\/p>\n
$\"\u57fa\u7840$
\n\u6c49\u660e\u7801\u80fd\u591f\u68c0\u6d4b\u6700\u591a\u4e24\u4e2a\u540c\u65f6\u53d1\u751f\u7684\u6bd4\u7279\u9519\u8bef\uff0c\u5e76\u4e14\u80fd\u591f\u66f4\u6b63\u5355\u4e00\u6bd4\u7279\u7684\u9519\u8bef\u3002\u6c49\u660e\u7801\u7684\u4f4d \u6570\u4e0e\u6570\u636e\u7684\u4f4d\u6570\u6709\u4e00\u4e2a\u4e0d\u7b49\u5f0f\u5173\u7cfb\uff0c\u5373:
\n2^P \u2265 P + D +1
\nP\u4ee3\u8868\u6c49\u660e\u7801\u7684\u4e2a\u6570\uff0cD\u4ee3\u8868\u6570\u636e\u4f4d\u7684\u4e2a\u6570,\u6bd4\u59824\u4f4d\u6570\u636e\u9700\u89813\u4f4d\u6c49\u660e\u7801\uff0c7\u4f4d\u6570\u636e\u9700\u89814\u4f4d\u6c49 \u660e\u7801\uff0c64\u4f4d\u6570\u636e\u65f6\u5c31\u9700\u89817\u4f4d\u6c49\u660e\u7801\u3002RAID2\u662f\u63091bit\u6765\u5206\u5272\u6570\u636e\u5199\u5165\u7684\uff0c\u800cP:D\u5c31\u4ee3\u8868\u4e86\u6570\u636e \u76d8\u4e0e\u6821\u9a8c\u76d8\u7684\u4e2a\u6570\u3002\u6240\u4ee5\u5982\u679c\u6570\u636e\u4f4d\u5bbd\u8d8a\u5927\uff0c\u7528\u4e8e\u6821\u9a8c\u7684\u76d8\u7684\u6bd4\u4f8b\u5c31\u8d8a\u5c0f\u3002\u7531\u4e8e\u6c49\u660e\u7801\u80fd\u591f\u7ea0\u6b63\u5355\u4e00\u6bd4\u7279\u7684\u9519\u8bef\uff0c\u6240\u4ee5\u5f53\u5355\u4e2a\u78c1\u76d8\u635f\u574f\u65f6\uff0c\u6c49\u660e\u7801\u4fbf\u80fd\u591f\u7ea0\u6b63\u6570\u636e\u3002<\/p>\n
RAID 2 \u56e0\u4e3a\u6bcf\u6b21\u8bfb\u5199\u90fd\u9700\u8981\u5168\u7ec4\u78c1\u76d8\u8054\u52a8\uff0c\u6240\u4ee5\u4e3a\u4e86\u6700\u5927\u5316\u5176\u6027\u80fd\uff0c\u6700\u597d\u4fdd\u8bc1\u6bcf\u5757\u78c1\u76d8\u4e3b\u8f74\u540c\u6b65\uff0c\u4f7f\u540c\u4e00\u65f6\u523b\u6bcf\u5757\u78c1\u76d8\u78c1\u5934\u6240\u5904\u7684\u6247\u533a\u903b\u8f91\u7f16\u53f7\u90fd\u4e00\u81f4\uff0c\u5e76\u5b58\u5e76\u53d6\uff0c\u8fbe\u5230\u6700\u4f73\u6027\u80fd\u3002 \u5982\u679c\u4e0d\u80fd\u540c\u6b65\uff0c\u5219\u4f1a\u4ea7\u751f\u7b49\u5f85\uff0c\u5f71\u54cd\u901f\u5ea6\u3002<\/p>\n
\u4e0eRAID0\u76f8\u6bd4\uff0cRAID2\u7684\u4f20\u8f93\u7387\u66f4\u597d\u3002\u56e0\u4e3aRAID0\u4e00\u822cstripe size\u00a0\u76f8\u5bf9\u4e8eRAID2\u76841bit\u6765\u8bf4\u5b9e\u5728\u592a\u5927\uff0c\u5e76\u4e0d\u80fd\u4fdd\u8bc1\u6bcf\u6b21\u90fd\u662f\u591a\u78c1\u76d8\u5e76\u884c\u3002\u800cRAID2\u6bcf\u6b21IO\u90fd\u80fd\u4fdd\u8bc1\u662f\u591a\u78c1\u76d8\u5e76\u884c\uff0c\u4e3a\u4e86 \u53d1\u6325\u8fd9\u4e2a\u4f18\u52bf\uff0c\u78c1\u76d8\u7684\u5bfb\u9053\u65f6\u95f4\u4e00\u5b9a\u8981\u51cf\u5c11(\u5bfb\u9053\u65f6\u95f4\u6bd4\u6570\u636e\u4f20\u8f93\u65f6\u95f4\u8981\u5927\u51e0\u4e2a\u6570\u91cf\u7ea7),\u6240 \u4ee5RAID2\u9002\u5408\u4e8e\u8fde\u7eedIO,\u5927\u5757IO(\u6bd4\u5982\u89c6\u9891\u6d41\u670d\u52a1)\u7684\u60c5\u51b5\u3002<\/p>\n
RAID 3<\/strong><\/span><\/div>\n
\u7c7b\u4f3c\u4e8eRAID2,\u6570\u636e\u6761\u5e26\u5316(stripe)\u5b58\u50a8\u4e8e\u4e0d\u540c\u7684\u786c\u76d8,\u6570\u636e\u4ee5\u5b57\u8282\u4e3a\u5355\u4f4d\uff0c\u53ea\u662fRAID3\u4f7f\u7528\u5355\u5757\u78c1\u76d8\u5b58\u50a8\u7b80\u5355\u7684 \u5947\u5076\u6821\u9a8c\u4fe1\u606f\uff0c\u6240\u4ee5\u6700\u7ec8\u78c1\u76d8\u6570\u91cf\u4e3a N+1 \u3002\u5f53\u8fd9N+1\u4e2a\u786c\u76d8\u4e2d\u7684\u5176\u4e2d\u4e00\u4e2a\u786c\u76d8\u51fa\u73b0\u6545\u969c\u65f6\uff0c\u4ece\u5176\u5b83N\u4e2a\u786c\u76d8\u4e2d\u7684\u6570\u636e\u4e5f\u53ef\u4ee5\u6062\u590d\u539f\u59cb\u6570\u636e,\u5f53\u66f4\u6362\u4e00\u4e2a\u65b0\u786c\u76d8\u540e\uff0c\u7cfb\u7edf\u53ef\u4ee5\u91cd\u65b0\u6062\u590d\u5b8c\u6574 \u7684\u6821\u9a8c\u5bb9\u9519\u4fe1\u606f\u3002<\/p>\n
$\"\u57fa\u7840$ <\/p>\n
\u7531\u4e8e\u5728\u4e00\u4e2a\u786c\u76d8\u9635\u5217\u4e2d\uff0c\u591a\u4e8e\u4e00\u4e2a\u786c\u76d8\u540c\u65f6\u51fa\u73b0\u6545\u969c\u7387\u7684\u51e0\u7387\u5f88\u5c0f\uff0c\u6240\u4ee5\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528 RAID3\uff0c\u5b89\u5168\u6027\u662f\u53ef\u4ee5\u5f97\u5230\u4fdd\u969c\u7684\u3002RAID 3\u4f1a\u628a\u6570\u636e\u7684\u5199\u5165\u64cd\u4f5c\u5206\u6563\u5230\u591a\u4e2a\u78c1\u76d8\u4e0a\u8fdb\u884c\uff0c\u4e0d\u7ba1\u662f\u5411\u54ea\u4e00\u4e2a\u6570\u636e\u76d8\u5199\u5165\u6570\u636e\uff0c \u90fd\u9700\u8981\u540c\u65f6\u91cd\u5199\u6821\u9a8c\u76d8\u4e2d\u7684\u76f8\u5173\u4fe1\u606f\u3002\u56e0\u6b64\uff0c\u5bf9\u4e8e\u90a3\u4e9b\u7ecf\u5e38\u9700\u8981\u6267\u884c\u5927\u91cf\u5199\u5165\u64cd\u4f5c\u7684\u5e94\u7528\u6765\u8bf4\uff0c\u6821\u9a8c\u76d8\u7684\u8d1f\u8f7d\u5c06\u4f1a\u5f88\u5927\uff0c\u65e0\u6cd5\u6ee1\u8db3\u7a0b\u5e8f\u7684\u8fd0\u884c\u901f\u5ea6\uff0c\u4ece\u800c\u5bfc\u81f4\u6574\u4e2aRAID\u7cfb\u7edf\u6027\u80fd\u7684\u4e0b\u964d\u3002 \u9274\u4e8e\u8fd9\u79cd\u539f\u56e0\uff0cRAID 3\u66f4\u52a0\u9002\u5408\u5e94\u7528\u4e8e\u90a3\u4e9b\u5199\u5165\u64cd\u4f5c\u8f83\u5c11\uff0c\u8bfb\u53d6\u64cd\u4f5c\u8f83\u591a\u7684\u5e94\u7528\u73af\u5883\uff0c\u4f8b\u5982 \u6570\u636e\u5e93\u548cWEB\u670d\u52a1\u5668\u7b49\u3002<\/p>\n
RAID 4<\/strong><\/span><\/div>\n
\u4e0eRAID3\u7c7b\u4f3c\uff0c\u4f46RAID4\u662f\u6309\u5757(\u6247\u533a)\u5b58\u53d6\u3002\u65e0\u987b\u50cfRAID3\u90a3\u6837\uff0c\u54ea\u6015\u6bcf\u4e00\u6b21\u5c0fI\/O\u64cd\u4f5c\u4e5f\u8981\u6d89 \u53ca\u5168\u7ec4\uff0c\u53ea\u9700\u6d89\u53ca\u7ec4\u4e2d\u4e24\u5757\u786c\u76d8\uff08\u4e00\u5757\u6570\u636e\u76d8\uff0c\u4e00\u5757\u6821\u9a8c\u76d8\uff09\u5373\u53ef\uff0c\u4ece\u800c\u63d0\u9ad8\u4e86\u5c0f\u91cf\u6570\u636e I\/O\u901f\u5ea6\u3002
\n $\"\u57fa\u7840$ <\/p>\n
RAID 5<\/strong><\/span><\/div>\n
\u5947\u5076\u6821\u9a8c(XOR)\uff0c\u6570\u636e\u4ee5\u5757\u5206\u6bb5\u6761\u5e26\u5316\u5b58\u50a8\u3002\u6821\u9a8c\u4fe1\u606f\u4ea4\u53c9\u5730\u5b58\u50a8\u5728\u6240\u6709\u7684\u6570\u636e\u76d8\u4e0a\u3002
\n $\"\u57fa\u7840$
\nRAID5\u628a\u6570\u636e\u548c\u76f8\u5bf9\u5e94\u7684\u5947\u5076\u6821\u9a8c\u4fe1\u606f\u5b58\u50a8\u5230\u7ec4\u6210RAID5\u7684\u5404\u4e2a\u78c1\u76d8\u4e0a\uff0c\u5e76\u4e14\u5947\u5076\u6821\u9a8c\u4fe1\u606f\u548c \u76f8\u5bf9\u5e94\u7684\u6570\u636e\u5206\u522b\u5b58\u50a8\u4e8e\u4e0d\u540c\u7684\u78c1\u76d8\u4e0a\uff0c\u5176\u4e2d\u4efb\u610fN-1\u5757\u78c1\u76d8\u4e0a\u90fd\u5b58\u50a8\u5b8c\u6574\u7684\u6570\u636e\uff0c\u4e5f\u5c31\u662f \u8bf4\u6709\u76f8\u5f53\u4e8e\u4e00\u5757\u78c1\u76d8\u5bb9\u91cf\u7684\u7a7a\u95f4\u7528\u4e8e\u5b58\u50a8\u5947\u5076\u6821\u9a8c\u4fe1\u606f\u3002\u56e0\u6b64\u5f53RAID5\u7684\u4e00\u4e2a\u78c1\u76d8\u53d1\u751f\u635f\u574f \u540e\uff0c\u4e0d\u4f1a\u5f71\u54cd\u6570\u636e\u7684\u5b8c\u6574\u6027\uff0c\u4ece\u800c\u4fdd\u8bc1\u4e86\u6570\u636e\u5b89\u5168\u3002\u5f53\u635f\u574f\u7684\u78c1\u76d8\u88ab\u66ff\u6362\u540e\uff0cRAID\u8fd8\u4f1a\u81ea\u52a8 \u5229\u7528\u5269\u4e0b\u5947\u5076\u6821\u9a8c\u4fe1\u606f\u53bb\u91cd\u5efa\u6b64\u78c1\u76d8\u4e0a\u7684\u6570\u636e\uff0c\u6765\u4fdd\u6301RAID5\u7684\u9ad8\u53ef\u9760\u6027\u3002<\/p>\n
RAID 5\u53ef\u4ee5\u7406\u89e3\u4e3a\u662fRAID 0\u548cRAID 1\u7684\u6298\u8877\u65b9\u6848\u3002RAID 5\u53ef\u4ee5\u4e3a\u7cfb\u7edf\u63d0\u4f9b\u6570\u636e\u5b89\u5168\u4fdd\u969c\uff0c\u4f46\u4fdd\u969c\u7a0b\u5ea6\u8981\u6bd4\u955c\u50cf\u4f4e\u800c\u78c1\u76d8\u7a7a\u95f4\u5229\u7528\u7387\u8981\u6bd4\u955c\u50cf\u9ad8\u3002RAID 5\u5177\u6709\u548cRAID 0\u76f8\u8fd1\u4f3c\u7684\u6570\u636e\u8bfb\u53d6 \u901f\u5ea6\uff0c\u53ea\u662f\u56e0\u4e3a\u591a\u4e86\u4e00\u4e2a\u5947\u5076\u6821\u9a8c\u4fe1\u606f\uff0c\u5199\u5165\u6570\u636e\u7684\u901f\u5ea6\u76f8\u5bf9\u5355\u72ec\u5199\u5165\u4e00\u5757\u786c\u76d8\u7684\u901f\u5ea6\u7565\u6162\u3002<\/p>\n
RAID 6<\/strong><\/span><\/div>\n
\u7c7b\u4f3cRAID5,\u4f46\u662f\u589e\u52a0\u4e86\u7b2c\u4e8c\u4e2a\u72ec\u7acb\u7684\u5947\u5076\u6821\u9a8c\u4fe1\u606f\u5757\uff0c\u4e24\u4e2a\u72ec\u7acb\u7684\u5947\u5076\u7cfb\u7edf\u4f7f\u7528\u4e0d\u540c\u7684\u7b97\u6cd5\uff0c\u6570\u636e\u7684\u53ef\u9760\u6027\u975e\u5e38\u9ad8\uff0c\u5373\u4f7f\u4e24\u5757\u78c1\u76d8\u540c\u65f6\u5931\u6548\u4e5f\u4e0d\u4f1a\u5f71\u54cd\u6570\u636e\u7684\u4f7f\u7528\u3002\u4f46RAID 6\u9700\u8981\u5206\u914d\u7ed9 \u5947\u5076\u6821\u9a8c\u4fe1\u606f\u66f4\u5927\u7684\u78c1\u76d8\u7a7a\u95f4\uff0c\u76f8\u5bf9\u4e8eRAID 5\u6709\u66f4\u5927\u7684\u201c\u5199\u635f\u5931\u201d\uff0c\u56e0\u6b64\u201c\u5199\u6027\u80fd\u201d\u975e\u5e38\u5dee\u3002<\/p>\n
$\"\u57fa\u7840$ <\/p>\n
\u7531\u56fe\u6240\u77e5\uff0c\u6bcf\u4e2a\u786c\u76d8\u4e0a\u9664\u4e86\u90fd\u6709\u540c\u7ea7\u6570\u636eXOR\u6821\u9a8c\u533a\u5916\uff0c\u8fd8\u6709\u4e00\u4e2a\u9488\u5bf9\u6bcf\u4e2a\u6570\u636e \u5757\u7684XOR\u6821\u9a8c\u533a\u3002\u5f53\u7136\uff0c\u5f53\u524d\u76d8\u6570\u636e\u5757\u7684\u6821\u9a8c\u6570\u636e\u4e0d\u53ef\u80fd\u5b58\u5728\u5f53\u524d\u76d8\u800c\u662f\u4ea4\u9519\u5b58\u50a8\u7684\u3002\u4ece\u6570\u5b66\u89d2\u5ea6\u6765\u8bf4\uff0cRAID 5\u4f7f\u7528\u4e00\u4e2a\u65b9\u7a0b\u5f0f\u89e3\u51fa\u4e00\u4e2a\u672a\u77e5\u53d8\u91cf\uff0c\u800cRAID 6\u5219\u80fd\u901a\u8fc7\u4e24\u4e2a\u72ec\u7acb\u7684\u7ebf\u6027\u65b9\u7a0b\u6784\u6210\u65b9\u7a0b\u7ec4\uff0c\u4ece\u800c\u6062\u590d\u4e24\u4e2a\u672a\u77e5\u6570\u636e\u3002<\/p>\n
\u4f34\u968f\u7740\u786c\u76d8\u5bb9\u91cf\u7684\u589e\u957f,RAID6\u5df2\u7ecf\u53d8\u5f97\u8d8a\u6765\u8d8a\u91cd\u8981\u3002TB\u7ea7\u522b\u7684\u786c\u76d8\u4e0a\u66f4\u5bb9\u6613\u9020\u6210\u6570\u636e\u4e22\u5931\uff0c\u6570\u636e\u91cd\u5efa\u8fc7\u7a0b(\u6bd4\u5982RAID5\uff0c\u53ea\u5141\u8bb8\u4e00\u5757\u786c\u76d8\u635f\u574f)\u4e5f\u8d8a\u6765\u8d8a\u957f\uff0c\u751a\u81f3\u5230\u6570\u5468\uff0c\u8fd9\u662f\u5b8c\u5168\u4e0d\u53ef\u63a5\u53d7\u7684\u3002\u800cRAID6\u5141\u8bb8\u4e24\u5757\u786c\u76d8\u540c\u65f6\u53d1\u751f\u6545\u969c\uff0c\u6240\u4ee5\u6e10\u6e10\u53d7\u5230\u4eba\u4eec\u7684\u9752\u7750\u3002<\/p>\n
\u4f34\u968fCD\uff0cDVD\u548c\u84dd\u5149\u5149\u76d8\u7684\u95ee\u4e16\uff0c\u5b58\u50a8\u4ecb\u8d28\u51fa\u73b0\u4e86\u64e6\u9664\u7801\u6280\u672f\uff0c\u5373\u4f7f\u5a92\u4ecb\u8868\u9762\u51fa\u73b0\u5212\u75d5\uff0c\u4ecd \u7136\u53ef\u4ee5\u64ad\u653e\uff0c\u5927\u591a\u6570\u5e38\u89c1\u7684\u64e6\u9664\u7801\u7b97\u6cd5\u5df2\u7ecf\u6f14\u53d8\u4e3a\u4e0a\u4e16\u7eaa60\u5e74\u4ee3\u9ebb\u7701\u7406\u5de5\u5b66\u9662\u6797\u80af\u5b9e\u9a8c\u5ba4\u5f00\u53d1\u7684Reed-Solomon\u7801\u3002\u5b9e\u9645\u60c5\u51b5\u4e2d\uff0c\u591a\u6570RAID6\u5b9e\u73b0\u90fd\u91c7\u7528\u4e86\u6807\u51c6\u7684RAID5\u6559\u6821\u9a8c\u6bd4\u7279\u548cReed-Solomon\u7801 \u3002\u800c\u7eaf\u64e6\u9664\u7801\u7b97\u6cd5\u7684\u4f7f\u7528\u4f7f\u5f97RAID6\u9635\u5217\u53ef\u4ee5\u5931\u6548\u4e24\u5757\u4ee5\u4e0a\u7684\u786c\u76d8,\u4fdd\u62a4\u529b\u5ea6\u66f4\u5f3a,\u6709\u4e9b\u5b9e\u73b0\u65b9\u6cd5\u63d0\u4f9b\u4e86\u591a\u79cd\u7ea7\u522b\u7684\u4fdd\u62a4\uff0c\u751a\u81f3\u5141\u8bb8\u7528\u6237(\u6216\u5b58\u50a8\u7ba1\u7406\u5458)\u6307\u5b9a\u4fdd\u62a4\u7ea7\u522b\u3002<\/p>\n
\u6df7\u5408RAID<\/strong><\/div>\n
RAID 01<\/strong><\/span><\/div>\n
\u987e\u540d\u601d\u4e49\uff0c\u662fRAID0\u548cRAID1\u7684\u7ed3\u5408\u3002\u5148\u505a\u6761\u5e26(0),\u518d\u505a\u955c\u50cf(1)\u3002<\/p>\n
$\"\"$ <\/p>\n
RAID 10<\/strong><\/span><\/div>\n
\u540c\u4e0a\uff0c\u4f46\u662f\u5148\u505a\u955c\u50cf(1)\uff0c\u518d\u505a\u6761\u5e26(0)<\/p>\n
$\"\"$ <\/p>\n
RAID01\u548cRAID10\u975e\u5e38\u76f8\u4f3c\uff0c\u4e8c\u8005\u5728\u8bfb\u5199\u6027\u80fd\u4e0a\u6ca1\u6709\u4ec0\u4e48\u5dee\u522b\u3002\u4f46\u662f\u5728\u5b89\u5168\u6027\u4e0aRAID10\u8981\u597d\u4e8e RAID01\u3002\u5982\u56fe\u4e2d\u6240\u793a\uff0c\u5047\u8bbeDISK0\u635f\u574f\uff0c\u5728RAID10\u4e2d\uff0c\u5728\u5269\u4e0b\u76843\u5757\u76d8\u4e2d\uff0c\u53ea\u6709\u5f53DISK1\u6545\u969c\uff0c \u6574\u4e2aRAID\u624d\u4f1a\u5931\u6548\u3002\u4f46\u5728RAID01\u4e2d\uff0cDISK0\u635f\u574f\u540e\uff0c\u5de6\u8fb9\u7684\u6761\u5e26\u5c06\u65e0\u6cd5\u8bfb\u53d6\uff0c\u5728\u5269\u4e0b\u76843\u5feb\u76d8 \u4e2d,\u53ea\u8981DISK2\u6216DISK3\u4e24\u4e2a\u76d8\u4e2d\u4efb\u4f55\u4e00\u4e2a\u635f\u574f,\u90fd\u4f1a\u5bfc\u81f4RAID\u5931\u6548\u3002<\/p>\n
RAID10\u548cRAID5\u4e5f\u662f\u7ecf\u5e38\u7528\u6765\u6bd4\u8f83\u7684\u4e24\u79cd\u65b9\u6848\uff0c\u4e8c\u8005\u90fd\u5728\u751f\u4ea7\u5b9e\u8df5\u4e2d\u5f97\u5230\u4e86\u5e7f\u6cdb\u7684\u5e94\u7528\u3002 RAID10\u5b89\u5168\u6027\u66f4\u9ad8\uff0c\u4f46\u662f\u7a7a\u95f4\u5229\u7528\u7387\u4f4e\u3002\u81f3\u4e8e\u8bfb\u5199\u6027\u80fd\uff0c\u4e0ecache\u6709\u5f88\u5927\u5173\u8054\uff0c\u6700\u597d\u6839\u636e\u5b9e \u9645\u60c5\u51b5\u6d4b\u8bd5\u6bd4\u8f83\u9009\u62e9\u3002<\/p>\n
\u975e\u6807\u51c6RAID<\/strong><\/div>\n
DRFS<\/strong><\/span><\/div>\n
DRFS,\u5373DistributedRaidFileSystem,\u662f\u4e00\u79cd\u5c1d\u8bd5\u5c06RAID\u4e0eHadoop\u7684DFS\u7ed3\u5408\u8d77\u6765\u7684\u6280\u672f\u3002 \u901a\u5e38\u7684HDFS\u5728\u5b9e\u8df5\u4e2d\u9700\u8981\u5c06replication factor\u8bbe\u4e3a3\u4ee5\u4fdd\u8bc1\u6570\u636e\u5b8c\u6574\u6027\uff0c\u800c\u5982\u679c\u5229\u7528 RAID\u7684stripe\u548cpartity(\u5947\u5076\u6821\u9a8c)\u6280\u672f,\u5c06\u6570\u636e\u5206\u4e3a\u591a\u4e2a\u5757\uff0c\u5e76\u4e14\u5b58\u50a8\u5404\u4e2a\u5757\u7684\u6821\u9a8c\u4fe1 \u606f(XOR\u6216\u64e6\u9664\u7801)\u3002\u6709\u4e86\u8fd9\u4e9b\u63aa\u65bd\uff0c\u5757\u7684\u526f\u672c\u6570\u5c31\u53ef\u4ee5\u964d\u4f4e\u5e76\u4e14\u4fdd\u8bc1\u540c\u6837\u7684\u6570\u636e\u53ef\u9760\u6027\uff0c\u5c31\u80fd\u8282\u7701\u76f8\u5f53\u4e00\u90e8\u5206\u7684\u5b58\u50a8\u7a7a\u95f4\u3002<\/p>\n
DRFS\u5305\u542b\u4ee5\u4e0b\u51e0\u4e2a\u7ec4\u4ef6\uff1a<\/p>\n
\n
DRFS client\u00a0: \u63d0\u4f9b\u5e94\u7528\u7a0b\u5e8f\u8bbf\u95eeDRFS\u7684\u63a5\u53e3\uff0c\u5728\u53d1\u73b0\u8bfb\u53d6\u5230\u7684\u6587\u4ef6\u6709\u635f\u574f\u65f6\u4fee\u590d,\u6574 \u4e2a\u64cd\u4f5c\u5bf9\u5e94\u7528\u7a0b\u5e8f\u900f\u660e<\/li>\n
RaidNode\u00a0: \u521b\u5efa\uff0c\u7ef4\u62a4\u68c0\u9a8c\u6587\u4ef6\u7684daemon<\/li>\n
BlockFixer\u00a0: \u5468\u671f\u6027\u5730\u68c0\u67e5\u6587\u4ef6,\u91cd\u65b0\u8ba1\u7b97\u6821\u9a8c\u548c,\u4fee\u590d\u6587\u4ef6.<\/li>\n
RaidShell\u00a0: \u7c7b\u4f3c\u4e8ehadoop shell.<\/li>\n
ErasureCode\u00a0: \u5373DRFS\u6240\u4f7f\u7528\u7684\u751f\u6210\u6821\u9a8c\u7801\u7684\u7b97\u6cd5\uff0c\u53ef\u4e3aXOR\u6216\u8005\u00a0Reed-Solomon\u7b97\u6cd5\u3002 XOR\u4ec5\u80fd\u521b\u5efa\u4e00\u4e2a\u6821\u9a8c\u5b57\u8282\uff0c\u800cReed-Solomon\u5219\u53ef\u4ee5\u521b\u5efa\u65e0\u6570\u4f4d(\u4f4d\u6570\u8d8a\u591a\uff0c\u80fd\u6062\u590d\u7684\u6570 \u636e\u4e5f\u8d8a\u591a),\u5982\u679c\u4f7f\u7528Reed-Solomon,replication\u751a\u81f3\u53ef\u4ee5\u964d\u4e3a1\uff0c\u7f3a\u70b9\u662f\u964d\u4f4e\u4e86\u6570\u636e\u8bfb \u5199\u7684\u5e76\u884c\u7a0b\u5ea6(\u53ea\u80fd\u4ece\u5355\u673a\u8bfb\u5199)\u3002<\/li>\n<\/ul>\n
\u5b9e\u73b0<\/strong><\/div>\n
\u8f6f\u4ef6\u5b9e\u73b0<\/strong><\/span><\/div>\n
\u73b0\u5728\u5f88\u90fd\u64cd\u4f5c\u7cfb\u7edf\u90fd\u63d0\u4f9b\u4e86RAID\u7684\u8f6f\u4ef6\u5b9e\u73b0,\u4e3b\u8981\u7531\u4ee5\u4e0b\u51e0\u4e2a\u65b9\u9762:<\/p>\n
\n
\u7531\u8f6f\u4ef6\u5728\u591a\u4e2a\u8bbe\u5907\u4e0a\u521b\u5efaRAID\uff0c\u6bd4\u5982linux\u4e0a\u7684mdadm\u5de5\u5177.\u5177\u4f53\u4f7f\u7528\u65b9\u6cd5\u53ef\u67e5\u770b\u53c2\u8003\u94fe\u63a5\u4e2d \u7684\u4f8b\u5b50\u3002<\/li>\n
LVM\u6216\u8005\u00a0Veritas,\u865a\u62df\u5377\u7ba1\u7406\u5de5\u5177.<\/li>\n
\u6587\u4ef6\u7cfb\u7edf\u5b9e\u73b0 :\u00a0btrfs,ZFS,GPFS.\u8fd9\u4e9b\u6587\u4ef6\u90fd\u53ef\u4ee5\u76f4\u63a5\u7ba1\u7406\u591a\u4e2a\u8bbe\u5907\u4e0a\u7684\u6570\u636e\uff0c\u5b9e \u73b0\u4e86\u7c7b\u4f3c\u5404\u7ea7RAID\u7684\u529f\u80fd\u3002<\/li>\n
\u5728\u5df2\u6709\u6587\u4ef6\u7cfb\u7edf\u4e4b\u4e0a\u63d0\u4f9b\u6570\u636e\u6821\u9a8c\u529f\u80fd\u7684RAID\u7cfb\u7edf(RAID-F)<\/li>\n<\/ul>\n
\u56fa\u4ef6\/\u9a71\u52a8\u5b9e\u73b0<\/strong><\/span><\/div>\n
\u8f6f\u4ef6\u5b9e\u73b0\u5e76\u603b\u662f\u4e0e\u7cfb\u7edf\u7684\u542f\u52a8\u8fdb\u7a0b\u517c\u5bb9\uff0c\u786c\u4ef6\u5b9e\u73b0(RAID\u63a7\u5236\u5668)\u603b\u662f\u592a\u8d35\u5e76\u4e14\u90fd\u662f\u5382\u5546\u4e13\u6709\u7684\u6280\u672f\uff0c\u6240\u4ee5 \u6709\u4e86\u4e00\u4e2d\u6df7\u5408\u7684\u5b9e\u73b0:\u7cfb\u7edf\u542f\u52a8\u65f6\uff0c\u7531\u56fa\u4ef6(firmware)\u6765\u5b9e\u73b0RAID\uff0c\u7cfb\u7edf\u542f\u52a8\u7684\u5dee\u4e0d\u591a\u4e86\uff0c\u7531\u9a71\u52a8\u6765\u7ba1 \u7406RAID\u3002\u5f53\u7136\uff0c\u8fd9\u9700\u8981\u64cd\u4f5c\u7cfb\u7edf\u5bf9\u8fd9\u79cd\u9a71\u52a8\u63d0\u4f9b\u652f\u6301\u3002<\/p>\n
\n
\u539f\u6587\u6765\u81ea\uff1ahttps:\/\/linux.cn\/article-4776-1.html<\/a><\/p>\n
\u672c\u6587\u5730\u5740\uff1a http:\/\/gulass.cn\/introduction-summary-raid.html<\/a>\u7f16\u8f91\u5458\uff1a\u90ed\u5efa\u9e4f\uff0c\u5ba1\u6838\u5458\uff1a\u9004\u589e\u5b9d<\/span><\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"
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