ZyXEL Communications NSA-2401 用户手册
Chapter 6 Storage Screens
NSA-2401 User’s Guide
132
6.4 Arrays
RAID (Redundant Array of Independent Disks) or JBOD is the storage method that the NSA
uses. The storage method you use depends on how many disks you have and how many
volumes you want to create. It’s important that you consider this carefully as all data is deleted
when you re-create a volume.
uses. The storage method you use depends on how many disks you have and how many
volumes you want to create. It’s important that you consider this carefully as all data is deleted
when you re-create a volume.
RAID is a method of storing data on multiple disks to provide a combination of greater
capacity, reliability, and/or speed. The NSA also supports JBOD (Just a Bunch Of Disks)
which is not technically a RAID storage method. You combine multiple physical disks into a
RAID or JBOD array.
capacity, reliability, and/or speed. The NSA also supports JBOD (Just a Bunch Of Disks)
which is not technically a RAID storage method. You combine multiple physical disks into a
RAID or JBOD array.
Hard Drives to Use With RAID
You can use RAID or JBOD for the physical hard disk drives installed in the NSA’s drive
bays. If you use RAID (instead of JBOD), it is recommended that you use hard drives of the
same storage capacity as RAID uses the capacity of the array’s smallest drive. For example, if
you have four disks of sizes 100 GB, 150 GB, 150 GB and 200 GB respectively in one RAID
array, then the maximum capacity is based on the size of the smallest disk size (100 GB) and
the remaining space (300 GB) is unused.
bays. If you use RAID (instead of JBOD), it is recommended that you use hard drives of the
same storage capacity as RAID uses the capacity of the array’s smallest drive. For example, if
you have four disks of sizes 100 GB, 150 GB, 150 GB and 200 GB respectively in one RAID
array, then the maximum capacity is based on the size of the smallest disk size (100 GB) and
the remaining space (300 GB) is unused.
6.4.1 RAID Levels
The type of array you use depends on how many disks you have and how many arrays you
want to create. Consider this carefully as all data is deleted when you re-create an array.
want to create. Consider this carefully as all data is deleted when you re-create an array.
"
Back up your data before deleting or re-creating an array
When Failed
This column indicates when (if ever) the attribute failed. An attribute has
failed if the normalized value is less than or equal to the threshold.
-: This displays if the attribute is not failing now and has never failed in the
past.
FAILING_NOW: This displays if the attribute’s current normalized value is
less than or equal to the threshold.
In_the_past: This displays if the attribute’s current normalized value is
greater than the threshold but the worst recorded value is less than or
equal to the threshold.
failed if the normalized value is less than or equal to the threshold.
-: This displays if the attribute is not failing now and has never failed in the
past.
FAILING_NOW: This displays if the attribute’s current normalized value is
less than or equal to the threshold.
In_the_past: This displays if the attribute’s current normalized value is
greater than the threshold but the worst recorded value is less than or
equal to the threshold.
Raw Value
This is the attribute’s unprocessed raw data. These values show exact
amounts of time or numbers of attempts or errors. The meaning to the raw
values is specific to the hard drive manufacturer.
amounts of time or numbers of attempts or errors. The meaning to the raw
values is specific to the hard drive manufacturer.
has some information about whether a higher or lower individual raw
S.M.A.R.T. attribute value is better.
S.M.A.R.T. attribute value is better.
OK
Click this button to close the screen.
Table 23 Storage > Internal Storage > Disk > S.M.A.R.T. (Full Summary) (continued)
LABEL/ICON
DESCRIPTION