Areca 24/4 Internal/External Port Pcie 3.0 12 Gb/s SAS/SATA Raid Controller 2Gb Cache - Manual (Page 185)

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WEB BROWSER-BASED CONFIGURATION
• Smart Option For HDD
This option is used to increases the reliability of SSDs/HDDs
by automatically copying data from a drive with potential
to fail to a designated hot spare or newly inserted drive. The
options are: “Failed The Drive”, “Failed The Drive If Hot Spare
Exist”, and “Alert Only”. The default is “Alert Only”.
Failed The Drive - controllers kill off the SMART fail drive
immediately.
Failed The Drive If Hot Spare Exist – controllers kill off the
SMART fail disk if hot spare dive is existed.
Alert Only – it will trigger alert when there happens a SMART
failed drive.
• Smart Polling Interval
Besides the scheduled volume check, user can define the
Smart Pulling Interval to pull the SMART status of each disk.
The default is “on demand”. User can schedule every certain
period of time interval to pull the SMART status of each disk.
When SMART pulling is executed, disk activity will be tempo-
rally halted until the SMART parameter reading is finished.
That is why you don’t want to set the Interval too frequent.
What to use is up to the users to decide based on their ap-
plications and experiment results.