RAID 1åQ?å’?的逻辑驱动器ä‹É用了å•一的阵列ã€?/p>
  ½Ž€å•地è¯ß_¼ŒRAID 0是没有冗余,它å¯ç”׃¸€ä¸ªæˆ–多个物ç†é©±åŠ¨å™¨ç»„æˆã€?/p>
  RAID 1是镜åƒå†—余,它在一个阵列ä¸éœ€è¦ä¸¤ä¸ªç‰©ç†é©±åЍ噍ã€?/p>
  RAID 3ä¸ÞZ¸“ç”¨å¥‡å¶æ ¡éªŒå†—余,åÏx‰€æœ‰çš„冗余数æ®éƒ½å˜å‚¨åœ¨ä¸€ä¸ªä¸“用的¼‚盘上,一个阵列至ž®‘由三个物ç†é©±åŠ¨å™¨ç»„æˆã€?/p>
  RAID 5ä¸ºåˆ†æ•£å¥‡å¶æ ¡éªŒå†—余,å³é˜µåˆ—ä¸çš„冗余数æ®åˆ†æ•£å˜å‚¨åœ¨é˜µåˆ—䏿‰€æœ‰ç£ç›˜ä¸ŠåQŒå®ƒçš„一个阵列ä¸è‡›_°‘需è¦ä¸‰ä¸ªç‰©ç†é©±åЍ噍ã€?/p>
  RAID 10åQ?0å’?0是逻辑驱动器跨‘Šé˜µåˆ—而组æˆçš„ã€?br /> 1.什么是¼‚盘阵列?
aåQŒå˜å‚¨çš„ä¿¡æ¯é‡å¤§åQŒæ¯”普通硬盘大了许多å€ï¼Œ˜q™ç§å€æ•°å…³ç³»ç”Þq¡¬ç›˜ä¸ªæ•°ã€æ¨¡å¼è®¾¾|®æ‰€å†›_®šã€?/p>
båQŒä¿¡æ¯å˜å–的速度快,是一å—硬盘读å–速度的åå€ä»¥ä¸Šï¼Œ¼‚盘阵列本èín一般都带有大容é‡ç¼“å˜ï¼Œòq¶ä¸”采用预读机制åQŒä¸ä»…能有效地æé«˜æ•°æ®çš„ä¼ è¾“é€ŸçŽ‡åQŒè¿˜èƒ½å‡ž®? ¼‹¬ç›˜çš„寻個ơ数åQŒä»Žè€Œé™ä½Žç¡¬ç›˜çš„æœºæ¢°¼‚¨æŸåQŒåšg长硬盘的使用寿命ã€?/p>
cåQŒå…·å¤‡æ•°æ®å®¹é”™èƒ½åŠ›å’ŒçùN𾿢å¤èƒ½åŠ›åQŒè¿™æ˜¯ç£ç›˜é˜µåˆ—最é‡è¦çš„特点\‚盘阵列采用一¿U冗余算法æ¥å˜å‚¨æ•°æ®åQŒå½“æ•°æ®å—æŸæˆ–其䏿Ÿå—硬盘出现故障时åQŒæ•´ä¸ªç³»¾lŸè¿˜ 能æ£å¸æ€‹É用,ä¸å—å½±å“åQŒåƈ且当æ¢ä¸Šæ–°ç›˜æ—Óž¼Œ¾pÈ»Ÿèƒ½å°†æ•°æ®ä¿®å¤ã€?/p>
dåQŒå¯æ ÒŽ(gu¨©)®æ•°æ®çš„é‡è¦è®¾¾|®ä¸åŒçš„工作模å¼åQŒåˆ†åˆ«å¯¹åº”ä¸åŒçš„安全¾U§åˆ«ã€?/p>
2.什么是RAID?
3.什么是RAID Level 0?
4.什么是RAID Level 1?
5.什么是RAID Level 3?
6.什么是RAID Level 5?
7.ä»€ä¹ˆæ˜¯çƒæ’拔硬ç›?
è¡?3ã€RAID0+1
从RAID
0+1å称上我们便å¯ä»¥çœ‹å‡ºæ˜¯RAID0与RAID1的结åˆä½“。在我们å•独使用RAID
1也会出现¾cÖM¼¼å•独使用RAID
0é‚£æ ·çš„é—®é¢˜ï¼Œå›_œ¨åŒä¸€æ—‰™—´å†…åªèƒ½å‘一å—ç£ç›˜å†™å…¥æ•°æ®ï¼Œä¸èƒ½å……分利用所有的资æºã€‚äØ“äº†è§£å†Œ™¿™ä¸€é—®é¢˜åQŒæˆ‘们å¯ä»¥åœ¨¼‚盘镜åƒä¸å¾ç«‹å¸¦åŒºé›†ã€‚å› ä¸ø™¿™¿Ué…¾|®æ–¹å¼ç»¼
åˆäº†å¸¦åŒºé›†å’Œé•œåƒçš„优势,所以被¿UîCØ“RAID
0+1。把RAID0å’ŒRAID1技术结åˆè“væ¥ï¼Œæ•°æ®é™¤åˆ†å¸ƒåœ¨å¤šä¸ªç›˜ä¸Šå¤–,æ¯ä¸ªç›˜éƒ½æœ‰å…¶ç‰©ç†é•œåƒç›˜ï¼Œæä¾›å…¨å†—余能力,å…许一个以下ç£ç›˜æ•…障,而ä¸å½±å“æ•°æ®
å¯ç”¨æ€§ï¼Œòq¶å…·æœ‰å¿«é€Ÿè¯»/写能力。RAID0+1è¦åœ¨¼‚盘镜åƒä¸å¾ç«‹å¸¦åŒºé›†è‡›_°‘4个硬盘ã€?/p>
ç”׃ºŽæˆ‘ä»¬æ¤æ¬¡åªæ˜¯ä»‹ç»å®¶ç”¨å°å¼æœºå¦‚何组建RAID¼‚盘阵列功能åQŒç›®å‰ä¸»‹¹çš„ä¸ÀL¿ä¹Ÿåªæ˜¯æä¾›è¿™ä¸‰ç§¾l„徿¨¡å¼åQŒå› æ¤å…¶å®ƒè¯¸å¦‚æœåŠ¡ç‰çš„高¾U§RAID模å¼åQŒè¿™é‡Œæˆ‘
们将ä¸å†˜q‡å¤šçš„介¾lã€?
傿•°å¾ˆå¤š,一般我们用 -c å’?-n 傿•°ž®±å¯ä»¥äº†. 例如:
./ab -c 1000 -n 1000 http://127.0.0.1/index.php
˜q™ä¸ªè¡¨ç¤ºåŒæ—¶å¤„ç†1000ä¸ªè¯·æ±‚åÆˆ˜q行1000‹Æ¡index.phpæ–‡äšg.
#/usr/local/xiaobai/apache2054/bin/ab -c 1000 -n 1000 http://127.0.0.1/index.html.zh-cn.gb2312
This is ApacheBench, Version 2.0.41-dev <$Revision: 1.121.2.12 $> apache-2.0
Copyright (c) 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright (c) 1998-2002 The Apache Software Foundation, http://www.apache.org/
Benchmarking 127.0.0.1 (be patient)
Completed 100 requests
Completed 200 requests
Completed 300 requests
Completed 400 requests
Completed 500 requests
Completed 600 requests
Completed 700 requests
Completed 800 requests
Completed 900 requests
Finished 1000 requests
Server Software: Apache/2.0.54
//òq›_°apache 版本2.0.54
Server Hostname: 127.0.0.1
//æœåŠ¡å™¨ä¸»æœºå
Server Port: 80
//æœåŠ¡å™¨ç«¯å?/font>
Document Path: /index.html.zh-cn.gb2312
//‹¹‹è¯•çš„é¡µé¢æ–‡æ¡?/font>
Document Length: 1018 bytes
//文档大å°
Concurrency Level: 1000
//òq¶å‘æ•?br />
Time taken for tests: 8.188731 seconds
//整个‹¹‹è¯•æŒç®‹çš„æ—¶é—?/font>
Complete requests: 1000
//完æˆçš„请求数é‡?/font>
Failed requests: 0
//å¤ÞpÓ|的请求数é‡?/font>
Write errors: 0
Total transferred: 1361581 bytes
//整个场景ä¸çš„¾|‘ç»œä¼ è¾“é‡?/font>
HTML transferred: 1055666 bytes
//整个场景ä¸çš„HTMLå†…å®¹ä¼ è¾“é‡?br />
Requests per second: 122.12 [#/sec] (mean)
//大家最兛_¿ƒçš„æŒ‡æ ‡ä¹‹ä¸€åQŒç›¸å½“于 LR ä¸çš„ æ¯ç§’事务æ•?/span> åQŒåŽé¢æ‹¬å·ä¸çš?/span> mean 表示˜q™æ˜¯ä¸€ä¸ªåã^å‡å€?/span>
Time per request: 8188.731 [ms] (mean)
//大家最兛_¿ƒçš„æŒ‡æ ‡ä¹‹äºŒï¼Œç›¸å½“äº?/span> LR ä¸çš„ òq›_‡äº‹åŠ¡å“应旉™—´ åQŒåŽé¢æ‹¬å·ä¸çš?/span> mean 表示˜q™æ˜¯ä¸€ä¸ªåã^å‡å€?/span>
Time per request: 8.189 [ms] (mean, across all concurrent requests)
//æ¯ä¸ªè¯äh±‚实际˜q行旉™—´çš„åã^å‡å€?/font>
Transfer rate: 162.30 [Kbytes/sec] received
//òq›_‡æ¯ç§’¾|‘络上的‹¹é‡åQŒå¯ä»¥å¸®åŠ©æŽ’é™¤æ˜¯å¦å˜åœ¨ç½‘¾lœæµé‡è¿‡å¤§å¯¼è‡´å“应时间åšg长的问题
Connection Times (ms)
min mean[+/-sd] median max
Connect: 4 646 1078.7 89 3291
Processing: 165 992 493.1 938 4712
Waiting: 118 934 480.6 882 4554
Total: 813 1638 1338.9 1093 7785
//¾|‘络上消耗的旉™—´çš„分解,å„项数æ®çš„å…·ä½“ç®—æ³•è¿˜ä¸æ˜¯å¾ˆæ¸…æ¥?/span>
Percentage of the requests served within a certain time (ms)
50% 1093
66% 1247
75% 1373
80% 1493
90% 4061
95% 4398
98% 5608
99% 7368
100% 7785 (longest request)
//æ•´ä¸ªåœºæ™¯ä¸æ‰€æœ‰è¯·æ±‚çš„å“åº”æƒ…å†µã€‚åœ¨åœºæ™¯ä¸æ¯ä¸ªè¯·æ±‚都有一个å“应时é—ß_¼Œå…¶ä¸50åQ…的用户å“应旉™—´ž®äºŽ1093 毫秒åQ?0åQ?的用户å“应时间å°äº?247 毫秒åQŒæœ€å¤§çš„å“应旉™—´ž®äºŽ7785 毫秒
ç”׃ºŽå¯¹äºŽòq¶å‘è¯äh±‚åQŒcpuå®žé™…ä¸ŠåÆˆä¸æ˜¯åŒæ—¶å¤„ç†çš„,而是按照æ¯ä¸ªè¯äh±‚获得的时间片é€ä¸ªè½®è{处ç†çš„,所以基本上½W¬ä¸€ä¸ªTime per requestæ—‰™—´¾U¦ç‰äºŽç¬¬äºŒä¸ªTime per requestæ—‰™—´ä¹˜ä»¥òq¶å‘è¯äh±‚æ•?/font>