Mixing Disks From Different Manufacturers Or With Different Capacities - Impediment RS-1600-X24 User Manual

Table 1–2 Comparing RAID levels (Continued)
RAID Level Min No. of
Drives
RAID 10 4
(Also known
as mirrored)
Volume Sets 1
A.3 Mixing Disks from Different
Manufacturers or with Different
Capacities
An array can contain disks with different capacities; for example, an array can include a 36-GB disk and
a 72-GB disk. If you mix disks with different capacities, the smallest disk determines the logical capacity
of all other disks in the array, regardless of RAID level. For example, if a RAID 0 array contains one 36-
GB disk and four 72-GB disks, the capacity of the array is equivalent to approximately five 36-GB disks.
To maximize disk capacity, use disks of similar size.
Important The manufacturer does not support mixing of different models, or manufacturer's, of drives in the
same enclosure.
Description
Combination of RAID 0
(data striping) and RAID
1 (mirroring)
Non-RAID, non-striped
mapping to a single
drive (similar to JBOD)
Strengths
Highest performance and
data protection (can tolerate
multiple drive failures)
Ability to use a single drive to
store additional data
Weaknesses
High redundancy cost overhead;
because all data is duplicated,
twice the storage capacity is
required; requires minimum of
four drives
Not protected, lower performance
(not striped)
Array Basics
93