Frequently Asked Questions
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Question |
Which is the
better RAID level, RAID 5 or RAID 6? |
Answer |
Generally,
this question is better posed as “which is the
more appropriate RAID level (5 or 6) for a
particular applicationâ€. Since both RAID 5 and
RAID 6 configurations will protect data in the event
of disk failures, the decision as to which to use
typically depends upon the number of drives in the
storage system and how much data protection is
desired. A RAID 5 system, regardless of how many
drives are in the configuration, will only protect
data from a single drive failure. If a second drive
fails, before the first failed drive is replaced
(and the lost data reconstructed), all of the data
on the array will be lost. However, RAID 6 systems
can protect from data loss even if two of its drives
fail simultaneously. Note that RAID level 5
requires a minimum of 3 drives in a storage system,
while RAID 6 requires a minimum of 4 (and sometimes
6) drives. Generally, in order to maximize capacity
and protection, RAID 6 is more appropriate only if a
storage system has 8 or more drives. With systems
that have fewer than 8 drives, RAID 5 is typically
the better choice. Additionally, in very mission
critical applications, RAID 6 is often the better
choice since two drives can fail without incurring
data loss. Again, for RAID 6 configurations, it is
best employed if a storage system has at least 8
drives. |