PLANET NAS-7450 - Manual (Page 43)

42
Item Description
JBOD Just a Bunch Of Disks.
A JBOD-type volume contains only one hard disk as its member.
RAID 0 RAID level 0 is disk striping only, which distribute data evenly over multiple
disks for better performance. It does not provide safeguards against failure.
RAID level 0 uses two or more hard disks.
RAID 1 RAID level 1 uses disk mirroring, which provides 100% duplication of data. It
offers high reliability, but doubles storage cost. RAID level 1 uses two hard
disks.
RAID 5 RAID level 5 distributes data and parity bits over multiple disks for both
performance and fault tolerance. A RAID volume can still work when a hard disk
fails. RAID level 5 uses three or more hard disks. Building a RAID-5 volume
may take hours depending on capacity.
RAID 6 RAID 6 (striped disks with dual parity) combines four or more disks in a way
that protects data against loss of any two disks.
RAID 10 RAID 1+0 (or 10) is a mirrored data set (RAID 1) which is then striped (RAID 0),
hence the “1+0” name. A RAID 1+0 array requires a minimum of four drives –
two mirrored drives to hold half of the striped data, plus another two mirrored for
the other half of the data. In Linux, MD RAID 10 is a non-nested RAID type like
RAID 1 that only requires a minimum of two drives and may give read