[daily][archlinux][mdadm][RAID] 软RAID

一, 使用mdadm创建RAID

参考：https://wiki.archlinux.org/index.php/RAID

1.  安装 mdadm

/home/tong [tong@TStation] [:]
> pacman -Ss mdadm
core/mdadm 4.0- (base) [installed]
    A tool for managing/monitoring Linux md device arrays, also known as Software RAID

2.  给单盘分区

　　2.1  GPT分区。

　　2.2  做好有分区，虽然裸盘也可以。

　　2.3  分区尾部预留100M的空余，因为：

Even hard drives of the same manufacturer and model can have small size differences. By leaving a little space at the end of the disk unallocated one can 
compensate for the size differences between drives, which makes choosing a replacement drive model easier. Therefore, it is good practice to leave 
about  MB of unallocated space at the end of the disk.

(parted) print free
Model: ATA WDC WD3000FYYZ- (scsi)
Disk /dev/sdc: 3001GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system  Name  Flags
        .4kB  1049kB  1031kB  Free Space
       1049kB  3000GB  3000GB  xfs
        3000GB  3001GB  105MB   Free Space

(parted) print
Model: ATA WDC WD3000FYYZ- (scsi)
Disk /dev/sdd: 3001GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system  Name  Flags
       1049kB  3000GB  3000GB

3.  使用mdadm制作RAID

/home/tong [tong@TStation] [:]
> sudo mdadm --create --verbose --level= --metadata=1.2 --raid-devices= /dev/md0 /dev/sdc1 /dev/sdd1
mdadm: size set to 2930030976K
mdadm: automatically enabling write-intent bitmap on large array
mdadm: array /dev/md0 started.

4. 后续详细设置参考:

https://wiki.archlinux.org/index.php/RAID#Installation

二, 使用lvm创建RAID

https://wiki.archlinux.org/index.php/LVM#RAID

0. 使用parted分区。

/home/tong [tong@TStation] [:]
> sudo parted /dev/sdc print
Model: ATA WDC WD3000FYYZ- (scsi)
Disk /dev/sdc: 3001GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system  Name  Flags
       2097kB  3000GB  3000GB

/home/tong [tong@TStation] [:]
> sudo parted /dev/sdd print
Model: ATA WDC WD3000FYYZ- (scsi)
Disk /dev/sdd: 3001GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system  Name  Flags
       2097kB  3000GB  3000GB

1.  创建物理卷

/home/tong [tong@TStation] [:]
> sudo pvcreate /dev/sdc1 /dev/sdd1
  Physical volume "/dev/sdc1" successfully created.
  Physical volume "/dev/sdd1" successfully created.

2. 创建卷组

/home/tong [tong@TStation] [:]
> sudo vgcreate VG_storage /dev/sdc1 /dev/sdd1
  Volume group "VG_storage" successfully created

3. 创建逻辑卷

more information： https://jlk.fjfi.cvut.cz/arch/manpages/man/lvmraid.7

How  LV data blocks are placed onto PVs is determined by the RAID level.  
RAID levels are commonly referred to as 'raid' followed by a number, e.g.  raid1, raid5 or  raid6.  

/home/tong [tong@TStation] [:]
> sudo lvcreate --type raid1 -l %FREE -n storage_raid1 VG_storage /dev/sdc1 /dev/sdd1
  Logical volume "storage_raid1" created.

/home/tong [tong@TStation] [:]
> sudo lvs -o name,segtype,size
  LV            Type  LSize
  storage_raid1 raid1 <.73t

4.  创建文件系统

/home/tong [tong@TStation] [:]
> sudo mkfs.xfs /dev/VG_storage/storage_raid1
meta-data=/dev/VG_storage/storage_raid1 isize=    agcount=, agsize= blks
         =                       sectsz=   attr=, projid32bit=
         =                       crc=        finobt=, sparse=, rmapbt=, reflink=
data     =                       bsize=   blocks=, imaxpct=
         =                       sunit=      swidth= blks
naming   =version               bsize=   ascii-ci= ftype=
log      =internal log           bsize=   blocks=, version=
         =                       sectsz=   sunit= blks, lazy-count=
realtime =none                   extsz=   blocks=, rtextents=

5。 挂载

/home/tong [tong@TStation] [:]
> tail -n  /etc/fstab
# /dev/mapper/VG_storage-storage_raid1
UUID=c5b048a0-b376-4a00-9a6f-9a9e418d982b       /home/tong/Storage      xfs             rw,relatime,attr2,inode64,noquota