分区--格式化-挂盘-磁盘阵列

Posted 2020-07-09

=============================== 生产环境 分区做raid

[[email protected]_168_11_203 tmp]# cat /proc/mdstat  查看做raid情况
Personalities : [raid1]
md0 : active raid1 sdc[1] sdb[0]
      998891520 blocks super 1.2 [2/2] [UU]
      bitmap: 2/8 pages [8KB], 65536KB chunk
unused devices: <none>

[[email protected]_168_11_203 ~]# fdisk -l  
   Disk /dev/sdb: 1023.0 GB, 1022999134208 bytes
   Disk /dev/sdc: 1023.0 GB, 1022999134208 bytes
   Disk /dev/sdd: 899.0  GB,  898999779328 bytes
   Disk /dev/sde: 899.0  GB,  898999779328 bytes
   Disk /dev/sda: 299.0  GB,  298999349248 bytes
   Disk /dev/md0: 1022.9 GB, 1022864916480 bytes

[[email protected]_168_11_203 ~]# df -h
   Filesystem            Size  Used Avail Use% Mounted on
   /dev/sda2              30G  4.8G   24G  17% /
   tmpfs                  64G  4.0K   64G   1% /dev/shm
   /dev/sda1             190M   47M  133M  27% /boot

  /dev/md0p1            938G  132G  759G  15% /data    <--- /dev/md0: 1022.9 GB
  /dev/sdd1             824G   73M  783G   1% /backup  <--- /dev/sdd: 899.0 GB
  /dev/sde1             824G   11G  773G   2% /logs    <--- /dev/sde: 899.0 GB
[[email protected]_168_11_203 ~]# cat /etc/fstab
  /dev/md0p1              /data                   ext4    defaults        0 0
  /dev/sdd1               /backup                 ext4    defaults        0 0
  /dev/sde1               /logs                   ext4    defaults        0 0

###################创建软RAID0
###分区
  fdisk /dev/sdb
    n/p/1/+50M/w
  fdisk /dev/sdc
    n/p/1/+50M/w
###安装软raid工具
   下载mdadm
      http://download.chinaunix.net/down.php?id=28095&ResourceID=6641&site=1
      tar jxf mdadm-3.0.tar.bz2
      make
      make install
 
###做软raid
   mdadm -C --verbose /dev/md0 --level=1 --raid-devices=2 /dev/sdb2 /dev/sdc2
   y

###查看是否有:/dev/md0
 fdisk -l
 
###格式化
   mkfs.ext4 /dev/md0
###查看raid信息
mdadm -D /dev/md0  
cat /proc/mdstat

###挂载
  mkdir /mdata
  mount /dev/md0 /mdata
### df -h 查看
/dev/md0         80M  1.6M   74M   3% /mdata




===================== 生成案例
[[email protected] /]# fdisk -l

Disk /dev/sda: 300.0 GB, 300000000000 bytes
255 heads, 63 sectors/track, 36472 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xe2b2e2b2

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          26      204800   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              26        3942    31457280   83  Linux
/dev/sda3            3942        4465     4194304   82  Linux swap / Solaris

Disk /dev/sdc: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000


Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000


Disk /dev/md0: 1000.1 GB, 1000070447104 bytes
2 heads, 4 sectors/track, 244157824 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 524288 bytes / 524288 bytes
Disk identifier: 0xfa2f1e15



[[email protected] /]# mdadm -C  /dev/md0 -c512 -l1 -n2 /dev/sd[b-c] --auto=yes


[[email protected] /]# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sdc[2] sdb[0]
      976631296 blocks super 1.2 level 5, 512k chunk, algorithm 2 [2/1] [U_]
      [==============>......]  recovery = 74.4% (727073492/976631296) finish=46.4min speed=89539K/sec
      bitmap: 0/8 pages [0KB], 65536KB chunk

unused devices: <none>


[[email protected]3 /]# mdadm -D /dev/md0
/dev/md0:
        Version : 1.2
  Creation Time : Fri May 20 16:41:57 2016
     Raid Level : raid5
     Array Size : 976631296 (931.39 GiB 1000.07 GB)
  Used Dev Size : 976631296 (931.39 GiB 1000.07 GB)
   Raid Devices : 2
  Total Devices : 2
    Persistence : Superblock is persistent

  Intent Bitmap : Internal

    Update Time : Fri May 20 18:49:25 2016
          State : clean, degraded, recovering
 Active Devices : 1
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 1

         Layout : left-symmetric
     Chunk Size : 512K

 Rebuild Status : 81% complete

           Name : oth-bj-119-090-062-013:0  (local to host oth-bj-119-090-062-013)
           UUID : 5e3e97cc:441c6a7e:5adc8f88:f21ec830
         Events : 1553

    Number   Major   Minor   RaidDevice State
       0       8       16        0      active sync   /dev/sdb
       2       8       32        1      spare rebuilding   /dev/sdc