{"id":19245,"date":"2016-07-31T06:52:11","date_gmt":"2016-07-30T22:52:11","guid":{"rendered":"https:\/\/2blog.ilc.edu.tw\/25793\/2016\/07\/31\/%e5%9c%a8-centos-7-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-7-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\/31\/%e5%9c%a8-centos-7-x-%e4%b8%8a%e4%bd%bf%e7%94%a8-raid-5\/","title":{"rendered":"\u5728 CentOS 7.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><\/p>\n

[@more@]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: 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: 42.9 GB, 42916118528 bytes, 83820544 sectors<\/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 : Thu Jun 30 03:31:44 2016<\/span>
\u00a0\u00a0\u00a0\u00a0 Raid Level : raid5<\/span>
\u00a0\u00a0\u00a0\u00a0 Array Size : 41910272 (39.97 GiB 42.92 GB)<\/span>
\u00a0 Used Dev Size : 20955136 (19.98 GiB 21.46 GB)<\/span>
\u00a0\u00a0 Raid Devices : 3<\/span>
\u00a0 Total Devices : 3<\/span>
\u00a0\u00a0\u00a0 Persistence : Superblock is persistent<\/span><\/p>\n

\u00a0\u00a0\u00a0 Update Time : Thu Jun 30 03:36:27 2016<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 State : clean, degraded, recovering<\/span>
\u00a0Active Devices : 2<\/span>
Working Devices : 3<\/span>
\u00a0Failed Devices : 0<\/span>
\u00a0 Spare Devices : 1<\/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 : 47% 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 : 40801919:fa833719:77db4a5b:bd3e0c50<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Events : 10<\/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 3\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 spare rebuilding\u00a0\u00a0 \/dev\/sdd<\/span><\/p>\n

6. \u683c\u5f0f\u5316\u5206\u5272\u5340 CentOS 7 \u6539\u7528 xfs
# mkfs.xfs \/dev\/md0<\/span>
meta-data=\/dev\/md0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 isize=256\u00a0\u00a0\u00a0 agcount=16, agsize=654720 blks<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 =\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 sectsz=512\u00a0\u00a0 attr=2, projid32bit=1<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 =\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 crc=0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 finobt=0<\/span>
data\u00a0\u00a0\u00a0\u00a0 =\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 bsize=4096\u00a0\u00a0 blocks=10475520, imaxpct=25<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 =\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 sunit=128\u00a0\u00a0\u00a0 swidth=256 blks<\/span>
naming\u00a0\u00a0 =version 2\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 bsize=4096\u00a0\u00a0 ascii-ci=0 ftype=0<\/span>
log\u00a0\u00a0\u00a0\u00a0\u00a0 =internal log\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 bsize=4096\u00a0\u00a0 blocks=5120, version=2<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 =\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 sectsz=512\u00a0\u00a0 sunit=8 blks, lazy-count=1<\/span>
realtime =none\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 extsz=4096\u00a0\u00a0 blocks=0, rtextents=0<\/span><\/p>\n

7. \u67e5\u770b\u786c\u789f\u7684 UUID
# blkid | grep \/dev\/md0<\/span>
\/dev\/md0: UUID=”fe9ac611-bb4a-4d85-87af-2998f6213cb8″ TYPE=”xfs”<\/span><\/p>\n

8. \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\u00a0\u00a0\u00a0 Size\u00a0 Used Avail Use% Mounted on<\/span>
\/dev\/mapper\/centos-root\u00a0 8.5G\u00a0 1.3G\u00a0 7.2G\u00a0 16% \/<\/span>
devtmpfs\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 983M\u00a0\u00a0\u00a0\u00a0 0\u00a0 983M\u00a0\u00a0 0% \/dev<\/span>
tmpfs\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 993M\u00a0\u00a0\u00a0\u00a0 0\u00a0 993M\u00a0\u00a0 0% \/dev\/shm<\/span>
tmpfs\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 993M\u00a0 8.7M\u00a0 985M\u00a0\u00a0 1% \/run<\/span>
tmpfs\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 993M\u00a0\u00a0\u00a0\u00a0 0\u00a0 993M\u00a0\u00a0 0% \/sys\/fs\/cgroup<\/span>
\/dev\/sda1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 497M\u00a0 153M\u00a0 345M\u00a0 31% \/boot<\/span>
tmpfs\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 199M\u00a0\u00a0\u00a0\u00a0 0\u00a0 199M\u00a0\u00a0 0% \/run\/user\/0<\/span>
\/dev\/md0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 40G\u00a0\u00a0 33M\u00a0\u00a0 40G\u00a0\u00a0 1% \/mnt\/raid5<\/span><\/p>\n

9. \u4fee\u6539 \/etc\/fstab<\/span>
# vim \/etc\/fstab<\/span>
\u52a0\u5165\u4e0b\u9762\u4e00\u884c
UUID=fe9ac611-bb4a-4d85-87af-2998f6213cb8 \/mnt\/raid5\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 xfs\u00a0\u00a0\u00a0\u00a0 defaults\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0 0<\/span><\/p>\n

10. \u7de8\u8f2f \/etc\/mdadm.conf<\/span>\u00a0 \u8a2d\u5b9a\u6a94
# mdadm –detail –scan –verbose > \/etc\/mdadm.conf<\/span>
# cat \/etc\/mdadm.conf<\/span>
ARRAY \/dev\/md0 level=raid5 num-devices=3 metadata=1.2 spares=1 name=localhost.localdomain:0 UUID=40801919:fa833719:77db4a5b:bd3e0c50<\/span>
\u00a0\u00a0 devices=\/dev\/sdb,\/dev\/sdc,\/dev\/sdd<\/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 7.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-19245","post","type-post","status-publish","format-standard","hentry","category-c-78462","category-c-98643"],"meta_key":{"_pingme":["1"],"_encloseme":["1"],"lt_post_id":["648880"]},"_links":{"self":[{"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/posts\/19245"}],"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=19245"}],"version-history":[{"count":1,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/posts\/19245\/revisions"}],"predecessor-version":[{"id":20803,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/posts\/19245\/revisions\/20803"}],"wp:attachment":[{"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/media?parent=19245"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/categories?post=19245"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/2blog.ilc.edu.tw\/25793\/wp-json\/wp\/v2\/tags?post=19245"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}