User`s guide

XStack Storage User’s Guide 29
In either case, when the XStack Storage unit finds replacement space on another drive, it
performs one Rebuild task for each extent that used space on the failed drive. If replacement
space is not available on the drives in the pool associated with the volume, and one or more
drives exist in the available pool, a drive is obtained from the available pool and
automatically moved to the volume’s pool. A Rebuild task can be suspended and resumed,
but cannot be cancelled.
 Grow (or Expand) Volume: The Administrator can expand the size of a volume. If the
volume’s organization requires initialization, the initialization of the new space is performed
with a Grow task. A Grow task can be suspended and resumed, but cannot be deleted. An
initiator can access the new space while the Grow task is being performed.
 Media Scan: The Administrator can scan a non-parity volume for media errors by starting a
Media Scan task. This task reads every block in the volume to ensure there are no errors. If
there are errors, this task fixes them if possible. A Media Scan task can be cancelled,
suspended, and/or resumed by the Administrator. It can also be scheduled for a future time
and/or at a recurring interval.
 Parity Scan: The Administrator can scan a parity volume for errors by starting a Parity Scan
task. This task reads every block in the volume looking for errors as described for Media Scan
to ensure that parity is correct. If parity errors are found, this task corrects the errors. A
Parity Scan task can be cancelled, suspended, and/or resumed by the Administrator. It can
also be scheduled for a future time and/or at a recurring interval.