![]() So my mdf files reside on one LUN, and my ldf's on another, with additional LUNS available for tempdb, and finally backups. NetApp recommends that system database files remain local to the SQL Server physical server, while all other database files are split out on LUNS that are on the NetApp appliance. Where we are in our adoption of this tool is that we have no choice but to convert from backups on local drives or SAN drives (Tivoli) to using this volume backup methodology. ![]() This is an awesome tool from a storage tech's point of view. Therefore, the snap commands do not work.NETApp is very good for what it was designed to do, which is, taking very fast snapshot backups of entire drives. You can use the snap rename command to save a Snapshot copy that contains data you want.ĭuring the volume move cutover phase, the SnapMirror source volume is not accessible. The snap sched command overwrites and deletes regularly scheduled Snapshot copies. You might want to rename a Snapshot copy generated by the snap sched command if it contains data that you want to save. You can use the snap list command output to determine which Snapshot copies to delete to free the most disk space. How to determine which Snapshot copies to delete on the basis of size.The amount of space displayed is an approximation because writing to the volume, creating Snapshot copies, or deleting Snapshot copies causes the reclaimed amount to change. You can display the amount of space you can reclaim by deleting one or more Snapshot copies in a volume by using the snap reclaimable command. Displaying space reclaimed from deleted Snapshot copies.Automatically deleting Snapshot copies can help you manage space utilization. Deleting Snapshot copies automatically You can define and enable a policy for automatically deleting Snapshot copies by using the snap autodelete command.This information can help you determine a suitable Snapshot copy schedule and Snapshot copy reserve. You can use the snap delta command to view the rate of change between two Snapshot copies as well as the rate of change between a Snapshot copy and the active file system. Displaying the rate of change between Snapshot copies.What file folding means and how it saves disk spaceįile folding describes the process of checking the data in the most recent Snapshot copy, and if this data is identical to the Snapshot copy currently being created, by referencing the previous Snapshot copy instead of taking up disk space writing the same data in the new Snapshot copy.When a file is changed, the Snapshot copy still points to the disk blocks where the file existed before it was modified, and changes are written to new disk blocks. What Snapshot disk consumption is Data ONTAP preserves pointers to all the disk blocks currently in use at the time the Snapshot copy is created.When looking for the version of the file you need, you should look for it by means of the creation time of the Snapshot copy. You might notice the issue only after one or more Snapshot copies were created with the incorrect copy of the file. You might need to access an earlier version of a file, because a file was changed, corrupted, or erased. Why you might need to access a particular Snapshot copy. ![]() You can create Snapshot copies manually by using the snap create command. You might need to create Snapshot copies outside a specified schedule. The schedule creates Snapshot copies automatically, and deletes older Snapshot copies after a specified period. You can configure the schedule to fit your needs.
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