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netapp snapshot

Posted on 2014-09-22
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Last Modified: 2014-10-12
Is there any reason why the old snapshot grow.
I understand that last snapshot grow when there is an activities on the lun.
See the lis below. The snap14 was on 50% testerday and today it went up to 51%.

  %/used       %/total  date          name
----------  ----------  ------------  --------
  3% ( 3%)    1% ( 1%)        sanp1
  3% ( 0%)    1% ( 0%)  
  3% ( 0%)    1% ( 0%)  
 14% (12%)    7% ( 6%)  
47% (13%)   39% ( 6%)  
 50% (10%)   44% ( 5%)  
 51% ( 1%)   44% ( 0%)          snap13
 51% ( 0%)   44% ( 0%)           snap14
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Question by:sara2000
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paulsolov earned 500 total points
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The oldest snapshot will grow since they're holding onto block that are changing.  The old the snapshot the more blocks it hold that have changed thus the larger it gets
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by:sara2000
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My understanding is this. When you take the snapshot the block is locked and it is only a read-only.
snapshot is pointing to that block and if there is any change on the data in that block then the change of data will be written in an another block.
Are you saying that the change of data will be written on the same block because of this the snapshot size is increasing?
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by:paulsolov
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Let me clarify.  Let's say you have a snapshot and you delete files/blocks as data changes over time.  This old data is still locked in the old snapshot so that the more things changed from the time you took the snapshot the larger it will get.  Say you have log file for a sql server, You take a snapshot, flush the log.  At this time the old log is still sitting in a snapshot until the snapshot is deleted.
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