Restore part of a file from a Snapshot copy
You can use the volume snapshot partial-restore-file
command to restore a range of data from a Snapshot copy to a LUN or to an NFS or SMB container file, assuming you know the starting byte offset of the data and the byte count. You might use this command to restore one of the databases on a host that stores multiple databases in the same LUN.
Beginning in ONTAP 9.12.1, partial restore is available for volumes using SnapMirror active sync.
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List the Snapshot copies in a volume:
volume snapshot show -vserver SVM -volume volume
For complete command syntax, see the man page.
The following example shows the Snapshot copies in
vol1
:clus1::> volume snapshot show -vserver vs1 -volume vol1 Vserver Volume Snapshot State Size Total% Used% ------- ------ ---------- ----------- ------ ----- ------ ----- vs1 vol1 hourly.2013-01-25_0005 valid 224KB 0% 0% daily.2013-01-25_0010 valid 92KB 0% 0% hourly.2013-01-25_0105 valid 228KB 0% 0% hourly.2013-01-25_0205 valid 236KB 0% 0% hourly.2013-01-25_0305 valid 244KB 0% 0% hourly.2013-01-25_0405 valid 244KB 0% 0% hourly.2013-01-25_0505 valid 244KB 0% 0% 7 entries were displayed.
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Restore part of a file from a Snapshot copy:
volume snapshot partial-restore-file -vserver SVM -volume volume -snapshot snapshot -path file_path -start-byte starting_byte -byte-count byte_count
The starting byte offset and byte count must be multiples of 4,096.
The following example restores the first 4,096 bytes of the file
myfile.txt
:cluster1::> volume snapshot partial-restore-file -vserver vs0 -volume vol1 -snapshot daily.2013-01-25_0010 -path /myfile.txt -start-byte 0 -byte-count 4096