{"id":19242,"date":"2016-07-28T06:06:51","date_gmt":"2016-07-27T22:06:51","guid":{"rendered":"https:\/\/2blog.ilc.edu.tw\/25793\/2016\/07\/28\/%e5%9c%a8-centos-6-x-%e4%b8%8a%e4%bd%bf%e7%94%a8-raid-5\/"},"modified":"2021-03-18T17:24:46","modified_gmt":"2021-03-18T09:24:46","slug":"%e5%9c%a8-centos-6-x-%e4%b8%8a%e4%bd%bf%e7%94%a8-raid-5","status":"publish","type":"post","link":"https:\/\/2blog.ilc.edu.tw\/25793\/2016\/07\/28\/%e5%9c%a8-centos-6-x-%e4%b8%8a%e4%bd%bf%e7%94%a8-raid-5\/","title":{"rendered":"\u5728 CentOS 6.x \u4e0a\u4f7f\u7528 RAID 5"},"content":{"rendered":"

1. \u5b89\u88dd mdadm \u5957\u4ef6
# yum install mdadm<\/span> <\/p>\n

2. \u67e5\u770b\u76ee\u524d\u78c1\u789f\u72c0\u614b
# fdisk -l | grep ‘^Disk \/dev\/sd’<\/span>
Disk \/dev\/sda: 10.7 GB, 10737418240 bytes <\/span>
Disk \/dev\/sdb: 21.5 GB, 21474836480 bytes <\/span>
Disk \/dev\/sdc: 21.5 GB, 21474836480 bytes <\/span>
Disk \/dev\/sdd: 21.5 GB, 21474836480 bytes <\/span>
Disk \/dev\/sde: 21.5 GB, 21474836480 bytes<\/span>[@more@]<\/p>\n

3. \u5efa\u7acb\u78c1\u789f\u5206\u5272\u5340
# fdisk \/dev\/sdb<\/span>
\"\" <\/a> <\/p>\n

\"\" <\/a> <\/p>\n

\"\" <\/a>
\u91cd\u8907\u4e0a\u9762\u7684\u52d5\u4f5c\uff0c\u5b8c\u6210\u6240\u6709\u7684\u78c1\u789f
# fdisk \/dev\/sdc<\/span>
# fdisk \/dev\/sdd<\/span>
# fdisk \/dev\/sde<\/span> <\/p>\n

4. \u5efa\u7acb \/dev\/md0<\/span> \u78c1\u789f\u9663\u5217\u5206\u5272\u5340
# mdadm –create –verbose –auto=yes \/dev\/md0 –level=5 –raid-devices=4 \/dev\/sd[b-e]<\/span>
mdadm: layout defaults to left-symmetric<\/span>
mdadm: layout defaults to left-symmetric<\/span>
mdadm: chunk size defaults to 512K<\/span>
mdadm: \/dev\/sdb appears to be part of a raid array:<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 level=raid0 devices=0 ctime=Thu Jan\u00a0 1 08:00:00 1970<\/span>
mdadm: partition table exists on \/dev\/sdb but will be lost or<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 meaningless after creating array<\/span>
mdadm: \/dev\/sdc appears to be part of a raid array:<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 level=raid0 devices=0 ctime=Thu Jan\u00a0 1 08:00:00 1970<\/span>
mdadm: partition table exists on \/dev\/sdc but will be lost or<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 meaningless after creating array<\/span>
mdadm: \/dev\/sdd appears to be part of a raid array:<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 level=raid0 devices=0 ctime=Thu Jan\u00a0 1 08:00:00 1970<\/span>
mdadm: partition table exists on \/dev\/sdd but will be lost or<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 meaningless after creating array<\/span>
mdadm: \/dev\/sde appears to be part of a raid array:<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 level=raid0 devices=0 ctime=Thu Jan\u00a0 1 08:00:00 1970<\/span>
mdadm: partition table exists on \/dev\/sde but will be lost or<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 meaningless after creating array<\/span>
mdadm: size set to 20955136K<\/span>
Continue creating array? yes<\/span><\/span>
mdadm: Defaulting to version 1.2 metadata<\/span>
mdadm: array \/dev\/md0 started.<\/span><\/p>\n

5. \u67e5\u770b\u5efa\u7f6e\u7d50\u679c
# fdisk -l | grep \/dev\/md0<\/span>
Disk \/dev\/md0: 64.4<\/span> GB, 64374177792 bytes<\/span><\/p>\n

# cat \/proc\/mdstat<\/span>
Personalities : [raid6] [raid5] [raid4]<\/span>
md0 : active raid5 sde[4] sdd[2] sdc[1] sdb[0]<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0 62865408 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4\/3] [UUU_]<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0 [>………………..]\u00a0 recovery =\u00a0 2.8% (607044\/20955136) finish=6.7min speed=50587K\/sec<\/span><\/p>\n

unused devices: <none><\/span><\/p>\n

# mdadm -D \/dev\/md0<\/span>
\/dev\/md0:<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Version : 1.2<\/span>
\u00a0 Creation Time : Wed Jun 29 08:16:51 2016<\/span>
\u00a0\u00a0\u00a0\u00a0 Raid Level : raid5<\/span>
\u00a0\u00a0\u00a0\u00a0 Array Size : 62865408 (59.95 GiB 64.37 GB)<\/span>
\u00a0 Used Dev Size : 20955136 (19.98 GiB 21.46 GB)<\/span>
\u00a0\u00a0 Raid Devices : 4<\/span>
\u00a0 Total Devices : 4<\/span>
\u00a0\u00a0\u00a0 Persistence : Superblock is persistent<\/span><\/p>\n

\u00a0\u00a0\u00a0 Update Time : Wed Jun 29 08:17:14 2016<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 State : clean, degraded, recovering<\/span>
\u00a0Active Devices : 3<\/span>
Working Devices : 4<\/span>
\u00a0Failed Devices : 0<\/span>
\u00a0 Spare Devices : 1<\/span><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Layout : left-symmetric<\/span>
\u00a0\u00a0\u00a0\u00a0 Chunk Size : 512K<\/span><\/p>\n

\u00a0Rebuild Status : 6% complete<\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Name : localhost.localdomain:0\u00a0 (local to host localhost.localdomain)<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 UUID : 17b9df4d:e3542df5:34c1a172:298a07a5<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Events : 2<\/span><\/p>\n

\u00a0\u00a0\u00a0 Number\u00a0\u00a0 Major\u00a0\u00a0 Minor\u00a0\u00a0 RaidDevice State<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 8\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 16\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a0 active sync\u00a0\u00a0 \/dev\/sdb<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 8\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 32\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1\u00a0\u00a0\u00a0\u00a0\u00a0 active sync\u00a0\u00a0 \/dev\/sdc<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 2\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 8\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 48\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 2\u00a0\u00a0\u00a0\u00a0\u00a0 active sync\u00a0\u00a0 \/dev\/sdd<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 4\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 8\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 64\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 3\u00a0\u00a0\u00a0\u00a0\u00a0 spare rebuilding\u00a0\u00a0 \/dev\/sde<\/span><\/p>\n

6. \u683c\u5f0f\u5316\u5206\u5272\u5340
# mkfs -t ext4 \/dev\/md0<\/span>
mke2fs 1.41.12 (17-May-2010)<\/span>
Filesystem label=<\/span>
OS type: Linux<\/span>
Block size=4096 (log=2)<\/span>
Fragment size=4096 (log=2)<\/span>
Stride=128 blocks, Stripe width=384 blocks<\/span>
3932160 inodes, 15716352 blocks<\/span>
785817 blocks (5.00%) reserved for the super user<\/span>
First data block=0<\/span>
Maximum filesystem blocks=4294967296<\/span>
480 block groups<\/span>
32768 blocks per group, 32768 fragments per group<\/span>
8192 inodes per group<\/span>
Superblock backups stored on blocks:<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 4096000, 7962624, 11239424<\/span><\/p>\n

Writing inode tables: done<\/span>
Creating journal (32768 blocks): done<\/span>
Writing superblocks and filesystem accounting information: done<\/span><\/p>\n

This filesystem will be automatically checked every 35 mounts or<\/span>
180 days, whichever comes first.\u00a0 Use tune2fs -c or -i to override.<\/span><\/p>\n

7. \u5efa\u7acb\u639b\u8f09\u76ee\u9304\u4e26\u639b\u8f09
# mkdir \/mnt\/raid5<\/span>
# mount \/dev\/md0 \/mnt\/raid5<\/span>
# df -h<\/span>
Filesystem\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Size\u00a0 Used Avail Use% Mounted on<\/span>
\/dev\/mapper\/VolGroup-lv_root<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 8.3G 1022M\u00a0 6.9G\u00a0 13% \/<\/span>
tmpfs\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 931M\u00a0\u00a0\u00a0\u00a0 0\u00a0 931M\u00a0\u00a0 0% \/dev\/shm<\/span>
\/dev\/sda1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 477M\u00a0\u00a0 63M\u00a0 389M\u00a0 14% \/boot<\/span>
\/dev\/md0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 59G\u00a0\u00a0 52M\u00a0\u00a0 56G\u00a0\u00a0 1% \/mnt\/raid5<\/span><\/p>\n

8. \u67e5\u770b\u786c\u789f\u7684 UUID
# blkid | grep \/dev\/md0<\/span>
\/dev\/md0: UUID=”a24bbe2b-c0f1-4417-99d9-866ea1f2a33d” TYPE=”ext4″<\/span><\/p>\n

9. \u4fee\u6539 \/etc\/fstab<\/span>
# vim \/etc\/fstab<\/span>
\u52a0\u5165\u4e0b\u9762\u4e00\u884c
UUID=a24bbe2b-c0f1-4417-99d9-866ea1f2a33d \/mnt\/raid5\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ext4\u00a0\u00a0\u00a0 defaults\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1 1<\/span><\/p>\n

10. \u7de8\u8f2f \/etc\/mdadm.conf<\/span>\u00a0 \u8a2d\u5b9a\u6a94
# mdadm –detail –scan –verbose >> \/etc\/mdadm.conf<\/span>
ARRAY \/dev\/md0 level=raid5 num-devices=4 metadata=1.2 name=localhost.localdomain:0 UUID=232bc54c:6583d975:ab90c836:78be7854<\/span>
\u00a0\u00a0 devices=\/dev\/sdb,\/dev\/sdc,\/dev\/sdd,\/dev\/sde<\/span><\/p>\n

11. \u91cd\u65b0\u555f\u52d5\u96fb\u8166
# reboot<\/span><\/p>\n

12. \u78c1\u789f\u5206\u5272\u8cc7\u8a0a
# fdisk -l | grep \/dev\/sd<\/span>
Disk \/dev\/sda: 10.7 GB, 10737418240 bytes<\/span>
\/dev\/sda1\u00a0\u00a0 *\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 64\u00a0\u00a0\u00a0\u00a0\u00a0 512000\u00a0\u00a0 83\u00a0 Linux<\/span>
\/dev\/sda2\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 64\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1306\u00a0\u00a0\u00a0\u00a0 9972736\u00a0\u00a0 8e\u00a0 Linux LVM<\/span>
Disk \/dev\/sdb: 21.5 GB, 21474836480 bytes<\/span>
\/dev\/sdb1\u00a0<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 2610\u00a0\u00a0\u00a0 20964793+\u00a0 fd\u00a0 Linux raid autodetect<\/span><\/span>
Disk \/dev\/sdc: 21.5 GB, 21474836480 bytes<\/span>
\/dev\/sdc1\u00a0<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 2610\u00a0\u00a0\u00a0 20964793+\u00a0 fd\u00a0 Linux raid autodetect<\/span><\/span>
Disk \/dev\/sdd: 21.5 GB, 21474836480 bytes<\/span>
\/dev\/sdd1<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 2610\u00a0\u00a0\u00a0 20964793+\u00a0 fd\u00a0 Linux raid autodetect<\/span><\/span>
Disk \/dev\/sde: 21.5 GB, 21474836480 bytes<\/span>
\/dev\/sde1<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 2610\u00a0\u00a0\u00a0 20964793+\u00a0 fd\u00a0 Linux raid autodetect<\/span><\/span><\/p>\n

13. \u6aa2\u67e5\u662f\u5426\u6709\u6b63\u78ba\u639b\u8f09
# df -h<\/span>
Filesystem\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Size\u00a0 Used Avail Use% Mounted on<\/span>
\/dev\/mapper\/VolGroup-lv_root<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 8.3G 1022M\u00a0 6.9G\u00a0 13% \/<\/span>
tmpfs\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 931M\u00a0\u00a0\u00a0\u00a0 0\u00a0 931M\u00a0\u00a0 0% \/dev\/shm<\/span>
\/dev\/sda1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 477M\u00a0\u00a0 63M\u00a0 389M\u00a0 14% \/boot<\/span>
\/dev\/md0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 59G\u00a0\u00a0 52M\u00a0\u00a0 56G\u00a0\u00a0 1% \/mnt\/raid5<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

1. \u5b89\u88dd mdadm \u5957\u4ef6 # yum install mdadm 2. \u67e5\u770b\u76ee\u524d\u78c1\u789f\u72c0\u614b # fdisk … <\/p>\n

\u95b1\u8b80\u5168\u6587\u3008\u5728 CentOS 6.x \u4e0a\u4f7f\u7528 RAID 5\u3009<\/span><\/a><\/p>\n","protected":false},"author":55,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[117,104],"tags":[],"class_list":["post-19242","post","type-post","status-publish","format-standard","hentry","category-c-78462","category-c-98643"],"meta_key":{"_pingme":["1"],"_encloseme":["1"],"lt_post_id":["648797"]},"_links":{"self":[{"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/posts\/19242"}],"collection":[{"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/users\/55"}],"replies":[{"embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/comments?post=19242"}],"version-history":[{"count":1,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/posts\/19242\/revisions"}],"predecessor-version":[{"id":20802,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/posts\/19242\/revisions\/20802"}],"wp:attachment":[{"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/media?parent=19242"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/categories?post=19242"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/tags?post=19242"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}