RAID Array and LVM Logical Volume Group (upper)

RAID Arrays and LVM logical volume groups are primarily used for backup-to-disk and extensions, where raid is used for Backup-to-disk and LVM for disk space management.

One: The principle of RAID work.

1. Soft raid is more commonly used with RAID0, RAID1, RAID5 and raid10,raid0 at least one hard drive: If multiple hard drives, the data will be striped across the hard disk (as shown). Because it does not provide redundancy, RAID0 is the fastest read/write in all raid scenarios, but without fault tolerance, any damage to a hard drive will disable the entire RAID and be less secure

2.RAID1 also requires a minimum of 2 hard drives, mirroring each other, a single working backup (pictured above), the highest security in a raid scenario.

3.RAID5 is based on the RAID0, no backup function; When a hard drive is broken, RAID5 will use the rest of the data and the corresponding checksum information to recover the corrupted data.

4.RAID10 is a combination of Raid0 and RAID1, which increases both the read/write speed and the backup function of the hard disk. But RAID10 requires a minimum of 4 hard drives (pictured above).