{"id":477108,"date":"2023-08-09T09:07:44","date_gmt":"2023-08-09T09:07:44","guid":{"rendered":""},"modified":"2023-09-05T11:14:03","modified_gmt":"2023-09-05T11:14:03","slug":"erasure-coding","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/erasure-coding\/","title":{"rendered":"X\u00f3a m\u00e3 h\u00f3a"},"content":{"rendered":"<h2>Gi\u1edbi thi\u1ec7u<\/h2>\n<p>M\u00e3 h\u00f3a x\u00f3a l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt b\u1ea3o v\u1ec7 d\u1eef li\u1ec7u v\u00e0 s\u1eeda l\u1ed7i m\u1ea1nh m\u1ebd \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong khoa h\u1ecdc m\u00e1y t\u00ednh v\u00e0 h\u1ec7 th\u1ed1ng l\u01b0u tr\u1eef d\u1eef li\u1ec7u. N\u00f3 cho ph\u00e9p d\u1ef1 ph\u00f2ng d\u1eef li\u1ec7u v\u00e0 kh\u1ea3 n\u0103ng ch\u1ecbu l\u1ed7i, \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a d\u1eef li\u1ec7u ngay c\u1ea3 khi m\u1ed9t s\u1ed1 ph\u1ea7n d\u1eef li\u1ec7u nh\u1ea5t \u0111\u1ecbnh kh\u00f4ng kh\u1ea3 d\u1ee5ng ho\u1eb7c b\u1ecb h\u1ecfng. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd \u0111i s\u00e2u v\u00e0o l\u1ecbch s\u1eed, nguy\u00ean t\u1eafc l\u00e0m vi\u1ec7c, lo\u1ea1i h\u00ecnh, \u1ee9ng d\u1ee5ng v\u00e0 quan \u0111i\u1ec3m trong t\u01b0\u01a1ng lai c\u1ee7a m\u00e3 h\u00f3a Erasure.<\/p>\n<h2>Ngu\u1ed3n g\u1ed1c v\u00e0 \u0111\u1ec1 c\u1eadp \u0111\u1ea7u ti\u00ean<\/h2>\n<p>Kh\u00e1i ni\u1ec7m m\u00e3 h\u00f3a Erasure c\u00f3 t\u1eeb nh\u1eefng n\u0103m 1950 khi Richard Hamming l\u1ea7n \u0111\u1ea7u ti\u00ean gi\u1edbi thi\u1ec7u c\u00e1c m\u00e3 s\u1eeda l\u1ed7i, \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 m\u00e3 Hamming, \u0111\u1ec3 ph\u00e1t hi\u1ec7n v\u00e0 s\u1eeda l\u1ed7i trong truy\u1ec1n d\u1eef li\u1ec7u s\u1ed1. \u00dd t\u01b0\u1edfng n\u00e0y c\u00f2n ph\u00e1t tri\u1ec3n h\u01a1n n\u1eefa v\u00e0 v\u00e0o nh\u1eefng n\u0103m 1990, c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u nh\u01b0 James S. Plank v\u00e0 Michael O. Rabin \u0111\u00e3 \u0111\u1eb7t n\u1ec1n m\u00f3ng cho c\u00e1c k\u1ef9 thu\u1eadt m\u00e3 h\u00f3a Erasure hi\u1ec7n \u0111\u1ea1i. K\u1ec3 t\u1eeb \u0111\u00f3, m\u00e3 h\u00f3a Erasure \u0111\u00e3 tr\u1edf th\u00e0nh m\u1ed9t kh\u00eda c\u1ea1nh quan tr\u1ecdng c\u1ee7a h\u1ec7 th\u1ed1ng l\u01b0u tr\u1eef d\u1eef li\u1ec7u, \u0111i\u1ec7n to\u00e1n \u0111\u00e1m m\u00e2y v\u00e0 \u0111i\u1ec7n to\u00e1n ph\u00e2n t\u00e1n.<\/p>\n<h2>Hi\u1ec3u m\u00e3 h\u00f3a x\u00f3a<\/h2>\n<p>M\u00e3 h\u00f3a x\u00f3a l\u00e0 m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p d\u1ef1 ph\u00f2ng d\u1eef li\u1ec7u trong \u0111\u00f3 d\u1eef li\u1ec7u g\u1ed1c \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i th\u00e0nh m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c \u0111o\u1ea1n ho\u1eb7c \u201ckh\u1ed1i\u201d \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a. C\u00e1c kh\u1ed1i n\u00e0y \u0111\u01b0\u1ee3c ph\u00e2n ph\u1ed1i tr\u00ean nhi\u1ec1u thi\u1ebft b\u1ecb l\u01b0u tr\u1eef ho\u1eb7c m\u00e1y ch\u1ee7, t\u1ea1o ra m\u1ed9t h\u1ec7 th\u1ed1ng c\u00f3 kh\u1ea3 n\u0103ng ch\u1ecbu l\u1ed7i. Khi d\u1eef li\u1ec7u b\u1ecb m\u1ea5t ho\u1eb7c kh\u00f4ng kh\u1ea3 d\u1ee5ng do l\u1ed7i ph\u1ea7n c\u1ee9ng ho\u1eb7c c\u00e1c s\u1ef1 c\u1ed1 kh\u00e1c, nh\u1eefng ph\u1ea7n b\u1ecb thi\u1ebfu c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng l\u1ea1i b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u00e1c \u0111o\u1ea1n c\u00f2n l\u1ea1i.<\/p>\n<h2>C\u01a1 c\u1ea5u n\u1ed9i b\u1ed9 v\u00e0 nguy\u00ean t\u1eafc l\u00e0m vi\u1ec7c<\/h2>\n<p>C\u1ed1t l\u00f5i c\u1ee7a m\u00e3 h\u00f3a Erasure l\u00e0 c\u00e1c thu\u1eadt to\u00e1n to\u00e1n h\u1ecdc chia d\u1eef li\u1ec7u th\u00e0nh c\u00e1c ph\u1ea7n nh\u1ecf h\u01a1n, th\u00eam d\u1eef li\u1ec7u d\u01b0 th\u1eeba v\u00e0 ph\u00e2n ph\u1ed1i ch\u00fang tr\u00ean c\u00e1c n\u00fat l\u01b0u tr\u1eef. Khi c\u00f3 y\u00eau c\u1ea7u truy xu\u1ea5t d\u1eef li\u1ec7u, h\u1ec7 th\u1ed1ng s\u1ebd thu th\u1eadp c\u00e1c \u0111o\u1ea1n \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a c\u00f3 s\u1eb5n v\u00e0 gi\u1ea3i m\u00e3 ch\u00fang \u0111\u1ec3 t\u00e1i t\u1ea1o l\u1ea1i d\u1eef li\u1ec7u g\u1ed1c. C\u00e1c nguy\u00ean t\u1eafc l\u00e0m vi\u1ec7c ch\u00ednh c\u1ee7a m\u00e3 h\u00f3a Erasure bao g\u1ed3m:<\/p>\n<ol>\n<li>\n<p><strong>T\u00e1ch d\u1eef li\u1ec7u<\/strong>: D\u1eef li\u1ec7u g\u1ed1c \u0111\u01b0\u1ee3c chia th\u00e0nh c\u00e1c \u0111o\u1ea1n ho\u1eb7c kh\u1ed1i nh\u1ecf h\u01a1n, m\u1ed7i \u0111o\u1ea1n ch\u1ee9a m\u1ed9t ph\u1ea7n d\u1eef li\u1ec7u.<\/p>\n<\/li>\n<li>\n<p><strong>D\u01b0<\/strong>: D\u1eef li\u1ec7u b\u1ed5 sung, \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 d\u1eef li\u1ec7u ch\u1eb5n l\u1ebb ho\u1eb7c d\u1eef li\u1ec7u d\u1ef1 ph\u00f2ng, \u0111\u01b0\u1ee3c t\u1ea1o t\u1eeb c\u00e1c kh\u1ed1i ban \u0111\u1ea7u \u0111\u1ec3 cho ph\u00e9p t\u00e1i c\u1ea5u tr\u00fac.<\/p>\n<\/li>\n<li>\n<p><strong>Ph\u00e2n b\u1ed5<\/strong>: C\u00e1c kh\u1ed1i \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a, c\u00f9ng v\u1edbi d\u1eef li\u1ec7u ch\u1eb5n l\u1ebb, \u0111\u01b0\u1ee3c ph\u00e2n ph\u1ed1i tr\u00ean nhi\u1ec1u n\u00fat l\u01b0u tr\u1eef ho\u1eb7c m\u00e1y ch\u1ee7.<\/p>\n<\/li>\n<li>\n<p><strong>T\u00e1i thi\u1ebft<\/strong>: Khi d\u1eef li\u1ec7u b\u1ecb m\u1ea5t ho\u1eb7c kh\u00f4ng th\u1ec3 truy c\u1eadp \u0111\u01b0\u1ee3c, c\u00e1c \u0111o\u1ea1n \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a c\u00f2n l\u1ea1i s\u1ebd \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng c\u00f9ng v\u1edbi d\u1eef li\u1ec7u ch\u1eb5n l\u1ebb \u0111\u1ec3 t\u00e1i t\u1ea1o l\u1ea1i c\u00e1c ph\u1ea7n b\u1ecb thi\u1ebfu.<\/p>\n<\/li>\n<\/ol>\n<h2>C\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a m\u00e3 h\u00f3a x\u00f3a<\/h2>\n<p>M\u00e3 h\u00f3a x\u00f3a cung c\u1ea5p m\u1ed9t s\u1ed1 t\u00ednh n\u0103ng quan tr\u1ecdng khi\u1ebfn n\u00f3 tr\u1edf th\u00e0nh c\u00f4ng ngh\u1ec7 c\u00f3 gi\u00e1 tr\u1ecb \u0111\u1ec3 b\u1ea3o v\u1ec7 v\u00e0 ph\u1ee5c h\u1ed3i d\u1eef li\u1ec7u:<\/p>\n<ul>\n<li>\n<p><strong>Dung sai l\u1ed7i<\/strong>: M\u00e3 h\u00f3a x\u00f3a cung c\u1ea5p kh\u1ea3 n\u0103ng ch\u1ecbu l\u1ed7i cao, cho ph\u00e9p ph\u1ee5c h\u1ed3i d\u1eef li\u1ec7u ngay c\u1ea3 khi c\u00f3 nhi\u1ec1u l\u1ed7i.<\/p>\n<\/li>\n<li>\n<p><strong>Gi\u1ea3m chi ph\u00ed l\u01b0u tr\u1eef<\/strong>: So v\u1edbi c\u00e1c ph\u01b0\u01a1ng ph\u00e1p sao ch\u00e9p d\u1eef li\u1ec7u truy\u1ec1n th\u1ed1ng, m\u00e3 h\u00f3a Erasure y\u00eau c\u1ea7u \u00edt kh\u00f4ng gian l\u01b0u tr\u1eef h\u01a1n \u0111\u1ec3 d\u1ef1 ph\u00f2ng.<\/p>\n<\/li>\n<li>\n<p><strong>\u0110\u1ed9 b\u1ec1n d\u1eef li\u1ec7u<\/strong>: D\u1eef li\u1ec7u \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 ch\u1ed1ng m\u1ea5t m\u00e1t v\u00e0 h\u01b0 h\u1ecfng, \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 b\u1ec1n l\u00e2u d\u00e0i.<\/p>\n<\/li>\n<li>\n<p><strong>Hi\u1ec7u qu\u1ea3 m\u1ea1ng<\/strong>: M\u00e3 h\u00f3a x\u00f3a l\u00e0m gi\u1ea3m m\u1ee9c ti\u00eau th\u1ee5 b\u0103ng th\u00f4ng m\u1ea1ng trong qu\u00e1 tr\u00ecnh x\u00e2y d\u1ef1ng l\u1ea1i d\u1eef li\u1ec7u.<\/p>\n<\/li>\n<li>\n<p><strong>Hi\u1ec7u qu\u1ea3 chi ph\u00ed<\/strong>: B\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng \u00edt kh\u00f4ng gian l\u01b0u tr\u1eef h\u01a1n, n\u00f3 c\u00f3 th\u1ec3 gi\u1ea3m \u0111\u00e1ng k\u1ec3 chi ph\u00ed c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng l\u01b0u tr\u1eef.<\/p>\n<\/li>\n<\/ul>\n<h2>C\u00e1c lo\u1ea1i m\u00e3 h\u00f3a x\u00f3a<\/h2>\n<p>M\u00e3 h\u00f3a x\u00f3a c\u00f3 nhi\u1ec1u lo\u1ea1i kh\u00e1c nhau, m\u1ed7i lo\u1ea1i \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u v\u00e0 s\u1ef1 c\u00e2n b\u1eb1ng c\u1ee5 th\u1ec3. C\u00e1c lo\u1ea1i m\u00e3 h\u00f3a Erasure th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng bao g\u1ed3m:<\/p>\n<table>\n<thead>\n<tr>\n<th>T\u00ean<\/th>\n<th>S\u1ef1 mi\u00eau t\u1ea3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Reed-Solomon<\/td>\n<td>\u0110\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i cho c\u00e1c h\u1ec7 th\u1ed1ng l\u01b0u tr\u1eef d\u1eef li\u1ec7u v\u00e0 c\u1ea5u h\u00ecnh RAID.<\/td>\n<\/tr>\n<tr>\n<td>Bi\u1ebfn \u0111\u1ed5i Luby (LT)<\/td>\n<td>\u0110\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c \u1ee9ng d\u1ee5ng truy\u1ec1n th\u00f4ng m\u1ea1ng v\u00e0 truy\u1ec1n ph\u00e1t.<\/td>\n<\/tr>\n<tr>\n<td>Cauchy Reed-Solomon<\/td>\n<td>Th\u00edch h\u1ee3p cho m\u00f4i tr\u01b0\u1eddng c\u00f3 \u0111\u1ed9 tr\u1ec5 cao v\u00e0 b\u0103ng th\u00f4ng h\u1ea1n ch\u1ebf.<\/td>\n<\/tr>\n<tr>\n<td>X\u00f3a d\u1ef1a tr\u00ean XOR<\/td>\n<td>\u0110\u01a1n gi\u1ea3n v\u00e0 hi\u1ec7u qu\u1ea3, nh\u01b0ng \u00edt ch\u1ecbu \u0111\u1ef1ng \u0111\u01b0\u1ee3c nhi\u1ec1u th\u1ea5t b\u1ea1i.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>S\u1eed d\u1ee5ng, th\u00e1ch th\u1ee9c v\u00e0 gi\u1ea3i ph\u00e1p<\/h2>\n<p>M\u00e3 h\u00f3a x\u00f3a t\u00ecm th\u1ea5y c\u00e1c \u1ee9ng d\u1ee5ng trong nhi\u1ec1u l\u0129nh v\u1ef1c kh\u00e1c nhau, ch\u1eb3ng h\u1ea1n nh\u01b0:<\/p>\n<ul>\n<li>\n<p><strong>L\u01b0u tr\u1eef d\u1eef li\u1ec7u<\/strong>: M\u00e3 h\u00f3a x\u00f3a \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c h\u1ec7 th\u1ed1ng l\u01b0u tr\u1eef ph\u00e2n t\u00e1n, l\u01b0u tr\u1eef \u0111\u1ed1i t\u01b0\u1ee3ng v\u00e0 n\u1ec1n t\u1ea3ng \u0111\u00e1m m\u00e2y \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 b\u1ec1n v\u00e0 t\u00ednh kh\u1ea3 d\u1ee5ng c\u1ee7a d\u1eef li\u1ec7u.<\/p>\n<\/li>\n<li>\n<p><strong>Ph\u00e2n ph\u1ed1i m\u00e1y t\u00ednh<\/strong>: Trong c\u00e1c khung \u0111i\u1ec7n to\u00e1n ph\u00e2n t\u00e1n, m\u00e3 h\u00f3a Erasure n\u00e2ng cao \u0111\u1ed9 tin c\u1eady c\u1ee7a d\u1eef li\u1ec7u v\u00e0 kh\u1ea3 n\u0103ng ch\u1ecbu l\u1ed7i.<\/p>\n<\/li>\n<li>\n<p><strong>M\u1ea1ng truy\u1ec1n th\u00f4ng<\/strong>: M\u00e3 h\u00f3a x\u00f3a \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c giao th\u1ee9c m\u1ea1ng \u0111\u1ec3 c\u1ea3i thi\u1ec7n hi\u1ec7u qu\u1ea3 truy\u1ec1n d\u1eef li\u1ec7u v\u00e0 kh\u1ea3 n\u0103ng ph\u1ee5c h\u1ed3i ch\u1ed1ng m\u1ea5t g\u00f3i.<\/p>\n<\/li>\n<\/ul>\n<p>Tuy nhi\u00ean, c\u00f3 m\u1ed9t s\u1ed1 th\u00e1ch th\u1ee9c li\u00ean quan \u0111\u1ebfn m\u00e3 h\u00f3a Erasure:<\/p>\n<ul>\n<li>\n<p><strong>Chi ph\u00ed CPU cao<\/strong>: C\u00e1c ho\u1ea1t \u0111\u1ed9ng m\u00e3 h\u00f3a v\u00e0 gi\u1ea3i m\u00e3 c\u00f3 th\u1ec3 \u0111\u00f2i h\u1ecfi nhi\u1ec1u t\u00ednh to\u00e1n, \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u n\u0103ng t\u1ed5ng th\u1ec3 c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n<\/li>\n<li>\n<p><strong>\u0110o\u1ea1n m\u00e3 x\u00f3a l\u1edbn<\/strong>: C\u00e1c \u0111o\u1ea1n m\u00e3 l\u1edbn h\u01a1n c\u00f3 th\u1ec3 l\u00e0m t\u0103ng y\u00eau c\u1ea7u v\u1ec1 b\u0103ng th\u00f4ng s\u1eeda ch\u1eefa, d\u1eabn \u0111\u1ebfn m\u1ee9c s\u1eed d\u1ee5ng m\u1ea1ng cao h\u01a1n.<\/p>\n<\/li>\n<\/ul>\n<p>\u0110\u1ec3 gi\u1ea3i quy\u1ebft nh\u1eefng th\u00e1ch th\u1ee9c n\u00e0y, c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u v\u00e0 k\u1ef9 s\u01b0 \u0111ang li\u00ean t\u1ee5c l\u00e0m vi\u1ec7c \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a c\u00e1c thu\u1eadt to\u00e1n v\u00e0 tri\u1ec3n khai m\u00e3 h\u00f3a Erasure.<\/p>\n<h2>\u0110\u1eb7c \u0111i\u1ec3m ch\u00ednh v\u00e0 so s\u00e1nh<\/h2>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 so s\u00e1nh m\u00e3 h\u00f3a Erasure v\u1edbi c\u00e1c k\u1ef9 thu\u1eadt b\u1ea3o v\u1ec7 d\u1eef li\u1ec7u kh\u00e1c:<\/p>\n<table>\n<thead>\n<tr>\n<th>K\u1ef9 thu\u1eadt<\/th>\n<th>M\u1ee9c \u0111\u1ed9 d\u01b0 th\u1eeba<\/th>\n<th>Chi ph\u00ed l\u01b0u tr\u1eef<\/th>\n<th>Dung sai l\u1ed7i<\/th>\n<th>Hi\u1ec7u qu\u1ea3 t\u00e1i thi\u1ebft<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Sao ch\u00e9p d\u1eef li\u1ec7u<\/td>\n<td>Cao<\/td>\n<td>Cao<\/td>\n<td>Gi\u1edbi h\u1ea1n<\/td>\n<td>Nhanh<\/td>\n<\/tr>\n<tr>\n<td>M\u00e3 h\u00f3a x\u00f3a<\/td>\n<td>Th\u1ea5p\/Trung b\u00ecnh<\/td>\n<td>Th\u1ea5p\/Trung b\u00ecnh<\/td>\n<td>Cao<\/td>\n<td>Bi\u1ebfn \u0111\u1ed5i<\/td>\n<\/tr>\n<tr>\n<td>S\u1eeda l\u1ed7i<\/td>\n<td>V\u1eeba ph\u1ea3i<\/td>\n<td>V\u1eeba ph\u1ea3i<\/td>\n<td>V\u1eeba ph\u1ea3i<\/td>\n<td>Bi\u1ebfn \u0111\u1ed5i<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Tri\u1ec3n v\u1ecdng t\u01b0\u01a1ng lai<\/h2>\n<p>Khi nhu c\u1ea7u l\u01b0u tr\u1eef d\u1eef li\u1ec7u t\u0103ng l\u00ean, m\u00e3 h\u00f3a Erasure d\u1ef1 ki\u1ebfn s\u1ebd \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong c\u00e1c c\u00f4ng ngh\u1ec7 t\u01b0\u01a1ng lai. Nh\u1eefng ti\u1ebfn b\u1ed9 trong t\u1ed1i \u01b0u h\u00f3a ph\u1ea7n c\u1ee9ng v\u00e0 ph\u1ea7n m\u1ec1m s\u1ebd gi\u00fap m\u00e3 h\u00f3a Erasure hi\u1ec7u qu\u1ea3 h\u01a1n v\u00e0 \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng r\u1ed9ng r\u00e3i h\u01a1n. Ngo\u00e0i ra, vi\u1ec7c t\u00edch h\u1ee3p m\u00e3 h\u00f3a Erasure v\u1edbi h\u1ecdc m\u00e1y v\u00e0 tr\u00ed tu\u1ec7 nh\u00e2n t\u1ea1o c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn nh\u1eefng c\u1ea3i ti\u1ebfn h\u01a1n n\u1eefa v\u1ec1 kh\u1ea3 n\u0103ng ch\u1ecbu l\u1ed7i v\u00e0 k\u1ef9 thu\u1eadt t\u00e1i t\u1ea1o d\u1eef li\u1ec7u.<\/p>\n<h2>X\u00f3a m\u00e3 h\u00f3a v\u00e0 m\u00e1y ch\u1ee7 proxy<\/h2>\n<p>C\u00e1c nh\u00e0 cung c\u1ea5p m\u00e1y ch\u1ee7 proxy nh\u01b0 OneProxy c\u00f3 th\u1ec3 h\u01b0\u1edfng l\u1ee3i t\u1eeb m\u00e3 h\u00f3a Erasure theo nhi\u1ec1u c\u00e1ch. B\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng m\u00e3 h\u00f3a Erasure cho h\u1ec7 th\u1ed1ng l\u01b0u tr\u1eef c\u1ee7a m\u00ecnh, h\u1ecd c\u00f3 th\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 b\u1ec1n d\u1eef li\u1ec7u cao v\u00e0 kh\u1ea3 n\u0103ng ch\u1ecbu l\u1ed7i. H\u01a1n n\u1eefa, h\u1ecd c\u00f3 th\u1ec3 t\u1ed1i \u01b0u h\u00f3a vi\u1ec7c s\u1eed d\u1ee5ng b\u0103ng th\u00f4ng m\u1ea1ng trong qu\u00e1 tr\u00ecnh x\u00e2y d\u1ef1ng l\u1ea1i d\u1eef li\u1ec7u, cung c\u1ea5p c\u00e1c d\u1ecbch v\u1ee5 nhanh h\u01a1n v\u00e0 \u0111\u00e1ng tin c\u1eady h\u01a1n cho kh\u00e1ch h\u00e0ng c\u1ee7a m\u00ecnh.<\/p>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<p>\u0110\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin v\u1ec1 m\u00e3 h\u00f3a Erasure, b\u1ea1n c\u00f3 th\u1ec3 kh\u00e1m ph\u00e1 c\u00e1c t\u00e0i nguy\u00ean sau:<\/p>\n<ol>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Erasure_code\" target=\"_new\" rel=\"noopener nofollow\">Wikipedia - M\u00e3 x\u00f3a<\/a><\/li>\n<li><a href=\"https:\/\/www.snia.org\/educational-library\/introduction-erasure-coding\" target=\"_new\" rel=\"noopener nofollow\">Gi\u1edbi thi\u1ec7u v\u1ec1 m\u00e3 h\u00f3a x\u00f3a<\/a><\/li>\n<li><a href=\"https:\/\/www.microsoft.com\/en-us\/research\/publication\/erasure-coding-in-windows-azure-storage\/\" target=\"_new\" rel=\"noopener nofollow\">X\u00f3a m\u00e3 h\u00f3a trong b\u1ed9 l\u01b0u tr\u1eef Windows Azure<\/a><\/li>\n<\/ol>\n<p>M\u00e3 h\u00f3a x\u00f3a l\u00e0 m\u1ed9t c\u00f4ng c\u1ee5 thi\u1ebft y\u1ebfu trong h\u1ec7 th\u1ed1ng m\u1ea1ng v\u00e0 l\u01b0u tr\u1eef d\u1eef li\u1ec7u hi\u1ec7n \u0111\u1ea1i. Kh\u1ea3 n\u0103ng \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n v\u00e0 s\u1eb5n c\u00f3 c\u1ee7a d\u1eef li\u1ec7u khi\u1ebfn n\u00f3 tr\u1edf th\u00e0nh c\u00f4ng ngh\u1ec7 c\u00f3 gi\u00e1 tr\u1ecb cho c\u00e1c doanh nghi\u1ec7p v\u00e0 t\u1ed5 ch\u1ee9c d\u1ef1a v\u00e0o vi\u1ec7c l\u01b0u tr\u1eef v\u00e0 ph\u00e2n ph\u1ed1i d\u1eef li\u1ec7u quy m\u00f4 l\u1edbn. Khi kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u ti\u1ebfp t\u1ee5c t\u0103ng l\u00ean, t\u1ea7m quan tr\u1ecdng c\u1ee7a m\u00e3 h\u00f3a Erasure s\u1ebd ng\u00e0y c\u00e0ng tr\u1edf n\u00ean r\u00f5 r\u00e0ng h\u01a1n trong vi\u1ec7c \u0111\u1ecbnh h\u00ecnh t\u01b0\u01a1ng lai c\u1ee7a c\u00e1c c\u00f4ng ngh\u1ec7 ph\u1ee5c h\u1ed3i v\u00e0 b\u1ea3o v\u1ec7 d\u1eef li\u1ec7u.<\/p>","protected":false},"featured_media":477109,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-477108","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Erasure Coding: An Overview<\/mark>","faq_items":[{"question":"What is Erasure coding?","answer":"<p>Erasure coding is a data protection and error correction technique used in computer science and data storage systems. It involves breaking down data into smaller encoded fragments, distributing them across multiple storage devices, and using redundant data to reconstruct lost or corrupted parts, ensuring data integrity and fault tolerance.<\/p>"},{"question":"How did Erasure coding originate?","answer":"<p>The concept of Erasure coding has its roots in the 1950s when Richard Hamming introduced error-correcting codes. Modern Erasure coding techniques were further developed by researchers like James S. Plank and Michael O. Rabin in the 1990s.<\/p>"},{"question":"How does Erasure coding work?","answer":"<p>Erasure coding internally employs mathematical algorithms to split data into smaller chunks, add redundancy, distribute them across storage nodes, and reconstruct missing parts using available encoded fragments and parity data.<\/p>"},{"question":"What are the key features of Erasure coding?","answer":"<p>Erasure coding offers fault tolerance, reduced storage overhead, data durability, network efficiency, and cost-effectiveness compared to traditional replication methods.<\/p>"},{"question":"What types of Erasure coding exist?","answer":"<p>Erasure coding comes in various types, including Reed-Solomon, Luby Transform (LT), Cauchy Reed-Solomon, and XOR-based Erasure coding, each tailored to specific requirements and trade-offs.<\/p>"},{"question":"How is Erasure coding used?","answer":"<p>Erasure coding finds applications in data storage systems, cloud computing, distributed computing, and communication networks, ensuring data durability and reliability.<\/p>"},{"question":"What are the challenges and solutions related to Erasure coding?","answer":"<p>Challenges include high CPU overhead and increased repair bandwidth for large code fragments. Solutions involve continuous optimization of algorithms and implementations.<\/p>"},{"question":"How does Erasure coding compare to other data protection techniques?","answer":"<p>In comparison to data replication and error correction, Erasure coding offers lower storage overhead, higher fault tolerance, and varying reconstruction efficiency.<\/p>"},{"question":"What are the future perspectives of Erasure coding?","answer":"<p>As data demands grow, Erasure coding is expected to play a vital role, with advancements in hardware and software optimization leading to greater efficiency and adoption. Integration with AI and machine learning may further enhance fault tolerance and data reconstruction.<\/p>"},{"question":"How can proxy servers benefit from Erasure coding?","answer":"<p>Proxy server providers like OneProxy can leverage Erasure coding for improved data durability, fault tolerance, and network efficiency, ensuring reliable and efficient services for their clients.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/477108","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/477108\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media\/477109"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=477108"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}