Redundant Disk Array RAID
Under the circumstances, doubling the speed of the fastest
Reduced safety
Two were written to disk
Increased safety
Costs
Parity and
compression
60-75% speed increase
There are certain security guarantees
Cost will enhance
Security Improvements 2 times
2 times faster
Table 7-1 mdadm common parameters and action command
| parameter | effect |
|---|---|
| -a | Testing equipment Name |
| -n | Specifies the number of devices |
| -l | Assign a RAID level |
| -C | create |
| -v | Display process |
| -f | Simulation equipment damage |
| -r | Remove Device |
| -Q | View summary information |
| -D | check the detail information |
| -S | Stop RAID disk array |
ls -l / dev / sd *
mdadm -Cv /dev/md0 -n 4 -l 10 /dev/sd[b-e]
mdadm -Q /dev/md0
View information mdadm -D / dev / md0
Format mkfs.xfs / dev / md0
mkdir / xiaoniu
Mount mount / dev / md0 / xiaoniu
vim /etc/fstab
/dev/md0 /xiaoniu xfs defaults 0 0
mdadm -D /dev/md0
mdadm /dev/md0 -f /dev/sde
mdadm /dev/md0 -r /dev/sde
mdadm -D /dev/md0
Add a new hard disk
mdadm /dev/md0 -a /dev/sde
Hot spare
To create the array group mdadm -Cv / dev / md0 -n 3 -l 5 -x 1 / dev / sd [be]
mdadm -D /dev/md0
mkfs.ext4 /dev/md0
mkdir / xiaoniu
mount /dev/md0 /xiaoniu
vim /etc/fstab
/dev/md0 /xiaoniu ext4 defaults 0 0