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Forum Discussion
RN314 - want to limit number of daily snapshots kept
Hello from sunny Los Angeles, CA! Ken here, working IT for a Wholesale business where I administer a ReadyNAS 314 with two mirrored 4TB drives. First day in the forum here, was about to start searc...
Yes.
btaroli wrote: Also good to know. But it is possible to have CoW enabled without snapshots. That's the basic point I wanted to make. The block behavior is driven by CoW.
-if bitrot protection is enabled and snapshots are enabled then CoW is enabled all the time
-if bitrot protection is disabled and snapshots are enabled, then CoW is enabled before a snapshot is taken, and disabled immediately afterwords.
In the latter case, "enabling" CoW means that the snapshot and the main share start out both pointing to the same underlying data when the snapshot is taken. If CoW were disabled, then the snapshot would start out as an independent copy. Future changes to the main share can still increase fragmentation, and will increase the amount of real disk space taken up by the snapshots.
Either way, it is the data churn that actually causes the fragmentation. If files are not updated (but are only added/deleted/renamed or completely re-written) then CoW will not increase fragmentation.
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