Proware EP-4643S2D2-F8S6, User Manual

Page: 117 / 151

Fibre to SAS/SATA Disk Array
User Manual 117
Disk Capacity Truncation Mode:
The Disk Array use drive truncation so that drives from different vendors are more
likely to be able to be used as spares for each other. Drive truncation slightly
decreases the usable capacity of a drive that is used in the subsystem. Options are:
Multiples Of 10G : If you have several 120GB drives from different vendors,
chances are that the capacity varies slightly. For example, one drive might be
121.1 GB, and the other 120.4 GB. This drive truncation mode makes the
121.1 GB and 120.4 GB drives same capacity as 120 GB so that one could
replace the other.
Multiples Of 1G: If you have 120 GB drives from different vendors, chances
are that the capacity varies slightly. For example, one drive might be 121.1
GB, and the other 121.4 GB. This drive truncation mode makes the 121.1 GB
and 121.4 GB drives same capacity 121 GB
so that one could replace the other.
No Truncation . The capacity of the disk drive is not truncated.
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 temporally 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 applications and
experiment results.