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FortiAnalyzer Version 3.0 MR7 Administration Guide
64 05-30007-0082-20080908
Config System
RAID 10
RAID 10 (or 1+0), includes nested RAID levels 1 and 0, or a stripe (RAID 0) of
mirrors (RAID 1). The total disk space available is the total number of disks in the
array (a minimum of 4) divided by 2. Any drive from a RAID 1 array can fail without
loss of data. However, should the other drive in the RAID 1 array fail, all data will
be lost. In this situation, it is important to replace a failed drive as quickly as
possible.
RAID 50
RAID 50 (or 5+0) includes nested RAID levels 5 and 0, or a stripe (RAID 0) and
stripe with parity (RAID 5). RAID 50 provides increased performance and also
ensures no data loss for the same reasons as RAID 5. For the following
FortiAnalyzer units, data is recoverable when:
• up to three disks fail (FortiAnalyzer-4000/4000A)
• up to two disks fail (FortiAnalyzer-2000/2000A).
RAID 5 with hot spare
FortiAnalyzer-2000/2000A and FortiAnalyzer-4000/4000A units can use one of
their hard disks as a hot spare (a stand-by disk for the RAID), should any of the
other RAID hard disks fail. If a hard disk fails, within a minute of the failure, the
FortiAnalyzer unit begins to automatically substitute the hot spare for the failed
drive, integrating it into the RAID array, and rebuilding the RAID’s data.
When you replace the failed hard disk, the FortiAnalyzer unit uses the new hard
disk as the new hot spare.
Hot swapping hard disks
Hot swapping refers to removing a failed hard disk and replacing it with a new one
while the FortiAnalyzer unit remains in operation.
FortiAnalyzer-100A/100B and FortiAnalyzer-100 units have a single hard disk. Hot
swapping is not available on these models.
FortiAnalyzer-400 models and higher can hot swap hard disks. For more
information, see the Knowledge Center article Replacing Hard Disks on the
FortiAnalyzer.
Hot swapping is supported only in FortiAnalyzer firmware 3.0 MR1 (build 292) and
higher. Hard disks in FortiAnalyzer units running firmware 3.0 (build 219) or earlier
are not hot swappable. Before replacing a disk, verify your firmware version in the
Dashboard of the web-based manager.
Note: Fortinet recommends using RAID 10 for redundancy instead of RAID 5 on
FortiAnalyzer units with software RAID. RAID 5 causes system performance issues.
Note: RAID 10 requires an even number of disks. For example, on the
FortiAnalyzer-2000/2000A, when selecting RAID 10 with hot spare, the FortiAnalyzer unit
will use four of the six disks in the RAID 10 array, keeping one as a hot spare. The
additional hard disk will be defined as idle.
The FortiAnalyzer-2000/2000A and FortiAnalyzer-4000/4000A also supports hot swapping
of hard drive disks during operation. For more information, see “Hot swapping the
FortiAnalyzer-2000/2000A and FortiAnalyzer-4000/4000A” on page 66.