4.4 Deduplication and Compression

Starting in Data ONTAP 8.1 deduplicated data can be reallocated using physical reallocation or

read_realloc space_optimized. Although data may be shared by multiple files when deduplicated,

reallocate uses an intelligent algorithm to only reallocate the data the first time a shared block is

encountered. Prior versions of Data ONTAP do not support reallocation of deduplicated data and will skip

any deduplicated data encountered.

Compressed data will not be reallocated by reallocate or read reallocate, and it is not recommended to

run reallocate on compressed volumes.

On Thu, Jan 17, 2013 at 1:04 PM, Brad Smith <bsmith@iup.edu> wrote:

Looking for help/direction on reallocating deduplicated volumes. Have a FAS2040 running 7.3.6 and adding an additional DS4243 shelf with SAS drives and want to extend current aggregate by adding a new raid group created with the new disk to the aggregate. On this aggregate I have volumes that are deduplicated and have snapshots. I have read several NetApp documents that seem to conflict on running reallocate on the volumes after adding the new disks to the existing aggregate. I have read you should reallocate but not on a volume that is deduplicated. I have also read that if you use the -p switch this will be OK, reallocate start -f -p /vol/VOLUMENAME.

Will I have problems if I run reallocate on my deduplicated volumes?

Thanks.

Brad
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