Areca 24/4 Internal/External Port Pcie 3.0 12 Gb/s SAS/SATA Raid Controller 2Gb Cache - Manual (Page 182)

WEB BROWSER-BASED CONFIGURATION
182
The RAID state will change to “Degraded Mode” while it pow-
ers on.
• Disk Write Cache Mode
User can set the “Disk Write Cache Mode” to Auto, Enabled, or
Disabled. “Enabled” increases speed, “Disabled” increases
reliability.
• Write Same For Initialization
Drives that support the Write Same feature (SCT) can write
to multiple drive sectors at once, improving initialization time.
To take advantage of this feature, all the drives in the unit
must support Write Same. User can set the “SAS And SATA”,
“SAS Only”, “SATA Only” or “Disabled” for the controller initial-
ization.
• Hot Plugged Disk For Rebuilding
It defines if the RAID array volume should start rebuilding or
not when detects a disk is inserted/re-inserted during online.
The options are: “Blank Disk Only”, “Always”, and “Disable”.
The default is “Blank Disk Only”.
“Blank Disk Only” – it will trigger the rebuilding if and only if
the inserted disk has not been in the RAID array before, which
has no RAID signature on it. So when a previously removed
disk is self re-inserted, it won’t trigger the degraded RAID ar-
ray to rebuild, and so that the administrator has a chance to
identify this mis-behaving disk and replaces it.
“Always” – it is what it was before. Whenever a disk is insert-
ed/re-inserted whether new or previously existed, it always
trigger a rebuilding for the Degraded RAID set/Volume.
“Disable” – it will not trigger rebuilding regardless what sort of
disk plugging in.
When “Disable” and/or “Blank Disk Only” is selected, the re-
inserted/previously removed disk will be identified as a disk in
a separate RAID set with duplicated RAID set# and with all
the rest of RAID members missing.