Darya.zelenina: Created page with "A '''minicopy''' is a streamlined copy operation involving copying data from a shadow set to a returning member of this shadow set using a Shadow Bitmap|shado..."

2019-07-17T09:47:00Z

Created page with "A '''minicopy''' is a streamlined copy operation involving copying data from a shadow set to a returning member of this shadow set using a Shadow Bitmap|shado..."

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A '''minicopy''' is a streamlined copy operation involving copying data from a [[Shadow Set|shadow set]] to a returning member of this shadow set using a [[Shadow Bitmap|shadow bitmap]]. A bitmap tracks writes to a shadow set
and is used to direct a minicopy operation when a shadow set memberis returned to the shadow set. Instead of copying the entire contents of a device, only the changed blocks, identified by the bitmap, are copied. Minicopy ensures that the data on a shadow set member, when returned to the shadow set, is identical to the data in the shadow set.

The minicopy feature was introduced in [[OpenVMS Version 7.3]].

=Preparing for Minicopy=
To prepare a shadow set for minicopy, use /POLICY=MINICOPY on the DISMOUNT command. You can view the bitmap created with SHOW DEVICES/BITMAP or SHOW DEVICES/FULL. You need the [[LOG_IO]] privilege to create bitmaps.

=Performing a Minicopy=
When a shadow set member for which a shadow bitmap was created (see [[#Performing a Minicopy|Performing a Minicopy]]) is returned to the shadow set with a MOUNT command, a minicopy is performed automatically. To guarantee that only a minicopy takes place, use the /POLICY=MINICOPY qualifier on the MOUNT command.

=See also=
* [https://support.hpe.com/hpsc/doc/public/display?docId=emr_na-c04622352 Volume Shadowing for OpenVMS]

Minicopy - Revision history

Darya.zelenina: Created page with "A '''minicopy''' is a streamlined copy operation involving copying data from a shadow set to a returning member of this shadow set using a Shadow Bitmap|shado..."