57
PDM also counts the number of media errors reported by
Media Patrol.
A disk drive becomes unhealthy when:
A SMART error is reported
The bad sector remapping table fills to the specified
level.
You can specify the maximum levels for the reassigned and
error blocks in PDM settings. When the table fills to a
specified value, PDM triggers a migration of data from the
suspect drive (the disk drive with the bad sectors) to a
replacement physical drive.
During data migration, you will have access to your logical
drives but they will respond more slowly to read/write tasks
because of the additional operation. The time required for
data migration depends on the size of the disk drives.
PDM is enabled on all disk arrays by default. You can
disable PDM in the disk array settings, however that action
is not recommended.
−
Transition:
Transition is the Process of replacing a revertible spare
drive that is currently part of a disk array with an
un-configured physical drive or a non-revertible spare. The
revertible spare drive returns to its original status. In order
to run the Transition function, the spare drive must be
revertible.
In addition, you must specify an un-configured physical
drive of the same or larger capacity and same media type
as the revertible spare drive.
−
Synchronization:
Synchronization is automatically applied to logical drives
when they are created. Synchronization recalculates the
redundancy data to ensure that the working data on the
physical drives is Properly in sync.
Mouse-over on the logical drive, click the
View
button, and
