1.) Can anyone please elaborate on the concept of Freezing and Unfreezing of Tapes
About frozen media
Afrozen volume is unavailable for future backups.Afrozen volume never expires,
even after the retention period ends for all backups on the media. The media ID
is never deleted from the NetBackup media catalog, and it remains assigned to
NetBackup.Afrozen volume is available for restores. If the backups have expired,
you must import the backups first.
NetBackup freezes media automatically when read or write errors surpass the
threshold within the time window. The default media error threshold is 2. That
is, NetBackup freezes media on the third media error in the default time window
(12 hours).
NetBackup also freezes a volume if a write failure makes future attempts at
positioning the tape unreliable.
Common reasons for write failures are dirty write heads or old media.The reason
for the action is logged in the NetBackup error catalog (view the Media Logs report
or the All Log Entries report).
You can use the NetBackup nbemmcmd command with the -media_error_threshold
and -time_window options to change the default values.
2.) So is it so I can freeze the tapes only if data is written on it?
Why you want to freeze the media ?
