Network Appliance (NetApp) advanced single-instance storage (A-SIS) deduplication is a free technology that ships with every NetApp filer. The technology works at the block level to efficiently compress volumes so that you can get more data in a limited space. All the deduplication setup and maintenance operations are controlled with the
sis command. For example, here is the output from
> sis status Path State Status Progress /vol/vol1 Enabled Idle Idle for 01:17:58 /vol/vol2 Enabled Idle Idle for 14:32:20 /vol/vol3 Enabled Idle Idle for 13:32:33
For some reason, there is no
sis command that will reveal how much space the deduplication has created. Fortunately,
df -s will take care of that.
> df -sh Filesystem used saved %saved /vol/vol0/ 2146MB 0MB 0% /vol/vol1/ 883GB 673GB 43% /vol/vol2/ 826GB 1557MB 0% /vol/vol3/ 100GB 40GB 29%
I added the
-h to make things a bit more readable.