ZyXEL NSA-2401 User Manual download pdf (Page 132)

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.

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.

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.

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.

" 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.

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. Table 42 on page 156

has some information about whether a higher or lower individual raw

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

1 2 ... 127 128 129 130 131 132 133 134 135 136 137 ... 361 362

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ZyXEL NSA-2401 User Manual Page 132