RAID-3µÈ¼¶
Parallel transfer with parity£¨²¢Ðд«Ê估УÑ飩
RAID 2µÈ¼¶µÄȱµãÏàÐÅ´ó¼ÒÒѾºÜÃ÷°×ÁË£¬ËäÈ»ÄܽøÐм´Ê±µÄECC£¬µ«³É±¾¼«Îª°º¹ó¡£Îª´Ë£¬Ò»ÖÖ¸üΪÏȽøµÄ¼´Ê±ECCµÄRAIDµÈ¼¶µ®Éú£¬Õâ¾ÍÊÇRAID 3¡£
RAID 3ÊÇÔÚRAID 2»ù´¡ÉÏ·¢Õ¹¶øÀ´µÄ£¬Ö÷ÒªµÄ±ä»¯ÊÇÓÃÏà¶Ô¼òµ¥µÄÒì»òÂß¼ÔËË㣨XOR£¬eXclusive OR£©Ð£Ñé´úÌæÁËÏà¶Ô¸´ÔӵĺºÃ÷ÂëУÑ飬´Ó¶øÒ²´ó·ù½µµÍÁ˳ɱ¾¡£XORµÄУÑéÔÀíÈçÏÂ±í£º
AÖµ |
BÖµ |
XOR½á¹û |
0 |
0 |
0 |
1 |
0 |
1 |
0 |
1 |
1 |
1 |
1 |
0 |
ÕâÀïµÄAÓëBÖµ¾Í´ú±íÁËÁ½¸ö룬´ÓÖпÉÒÔ·¢ÏÖ£¬AÓëBÒ»Ñùʱ£¬XOR½á¹ûΪ0£¬AÓëB²»Ò»Ñùʱ£¬XOR½á¹û¾ÍÊÇ1£¬¶øÇÒÖªµÀXOR½á¹ûºÍAÓëBÖеÄÈκÎÒ»¸öÊýÖµ£¬¾Í¿ÉÒÔ·´ÍƳöÁíÒ»¸öÊýÖµ¡£±ÈÈçAΪ1£¬XOR½á¹ûΪ1£¬ÄÇôB¿Ï¶¨Îª0£¬Èç¹ûXOR½á¹ûΪ0£¬ÄÇôB¿Ï¶¨Îª1¡£Õâ¾ÍÊÇXOR±àÂëÓëУÑéµÄ»ù±¾ÔÀí¡£
RAID 3µÄ½á¹¹Í¼ÈçÏ£º
RAID-3½á¹¹Í¼½â
´ÓͼÖпÉÒÔ·¢ÏÖ£¬Ð£ÑéÅÌÖ»ÓÐÒ»¸ö£¬¶øÊý¾ÝÓëRAID 0Ò»ÑùÊÇ·Ö³ÉÌõ´ø£¨Stripe£©´æÈëÊý¾ÝÕóÁÐÖУ¬Õâ¸öÌõ´øµÄÉî¶ÈµÄµ¥Î»Îª×Ö½Ú¶ø²»ÔÙÊÇbitÁË¡£ÔÚÊý¾Ý´æÈëʱ£¬Êý¾ÝÕóÁÐÖд¦ÓÚͬһµÈ¼¶µÄÌõ´øµÄXORУÑé±àÂë±»¼´Ê±Ð´ÔÚУÑéÅÌÏàÓ¦µÄλÖã¬ËùÒԱ˴˲»»á¸ÉÈÅ»ìÂÒ¡£¶Áȡʱ£¬ÔòÔÚµ÷³öÌõ´øµÄͬʱ¼ì²éУÑéÅÌÖÐÏàÓ¦µÄXOR±àÂ룬½øÐм´Ê±µÄECC¡£ÓÉÓÚÔÚ¶ÁдʱÓëRAID 0ºÜÏàËÆ£¬ËùÒÔRAID 3¾ßÓкܸߵÄÊý¾Ý´«ÊäЧÂÊ¡£
RAID 3ÔÚRAID 2»ù´¡Éϳɹ¦µØ½øÐнṹÓëÔËËãµÄ¼ò»¯£¬ÔøÊܵ½¹ã·ºµÄ»¶Ó£¬²¢´óÁ¿Ó¦Óá£Ö±µ½¸üΪÏȽø¸ßЧµÄRAID 5³öÏÖºó£¬RAID 3²Å¿ªÊ¼ÂýÂýÍ˳öÊг¡¡£ÏÂÃæÈÃÎÒÃÇ×ܽáÒ»ÏÂRAID 3µÄÌص㣺
×¢£ºÖ÷Öáͬ²½ÊÇÖ¸ÕóÁÐÖÐËùÓÐÓ²Å̵ÄÖ÷ÖáÂí´ïͬ²½ |