NetApp: Enabling Deduplication (ASIS) On A Volume
Below shows how to setup NetApp deduplication (formerly ASIS) on an existing volume. The following example is running NetApp Release 7.2.5.1. The license are now free, and were already installed.
Check to make sure the licensces are installed
NAS> license
nearstore_option xxxxxZH
a_sis xxxxxCG
Enable sis (deduplication) on the volume
NAS> sis on /vol/testVol
SIS for “/vol/testVol” is enabled.
Already existing data could be processed by running “sis start -s /vol/testVol”.
Initiate deduplication service
NAS> sis start -s /vol/testVol
The file system will be scanned to process existing data in /vol/testVol.
This operation may initialize related existing metafiles.
Are you sure you want to proceed with scan (y/n)? y
Thu Nov 13 10:01:38 EST [wafl.scan.start:info]: Starting SIS volume scan on volume testVol.
The SIS operation for “/vol/testVol” is started.
NAS> Thu Nov 13 10:01:42 EST [wafl.snap.delete:info]: Snapshot copy sis.93057f3c-aed8-11dd-a6d9-00a09804ad86 on volume testVol NetApp was deleted by the Data ONTAP function dense_delete_snapshot. The unique ID for this Snapshot copy is (44, 156).
Sis status will display the state and running status on all volumes
NAS> sis status
| Path | State | Status | Progress |
| /vol/Shares | Enabled | Idle | Idle for 10:05:52 |
| /vol/testVol | Enabled | Idle | Idle for 08:48:40 |
| /vol/luns | Disabled | Idle | Idle for 2330:43:02 |
| /vol/vm | Enabled | Idle | Idle for 00:09:35 |
View the status on a specific volume
NAS> sis status /vol/testVol
| Path | State | Status | Progress |
| /vol/testVol | Enabled | Idle | Idle for 00:11:23 |
After sis completes, use df to show the amount saved and deduplication percentage
NAS> df -sh /vol/testVol
| Filesystem | used | saved | %saved |
| /vol/testVol/ | 519GB | 754GB | 59% |
Verify that sis is scheduled to run frequent enough at the times you want
NAS> sis config
| Path | Schedule |
| /vol/shares | sun-sat@0 |
| /vol/testVol | sun-sat@0 |
| /vol/luns | sun-sat@0 |
| /vol/vm | sun-sat@0 |
Below is the help output of sis config
NAS> sis help config
sis config [ [ -s schedule ] <path> | <path> … ]
- Sets up, modifies, and retrieves the schedule of SIS volumes.
Reschedule for nightly at 11pm
NAS> sis config -s sun-sat@23 /vol/testVol
Verify the new configuration
NAS> sis config /vol/testVol
| Path | Schedule |
| /vol/testVol | sun-sat@23 |
Note: ASIS is not real time deduplication. It is ran on a schedule instead of as the data is coming in. Also, when setting the schedule for a volume, you can only specifiy the hour to start running, in this case trying to specify sun-sat@23:45 did not work when testing.
Hi, Kevin.
Can you comment some recent FUD about step-by-step lowering an A-SIS (deduplication) rate at NetApp storages under a VMware, after a time, especially at NFS?
Some people spreading it, and I try to find a practical men, who used dedupe at NetApp with VMware/NFS for a years.
Can you comment your experience with dedupe savings rate since 2008?
romx said this on January 8, 2011 at 10:22 pm
Hi, great tips.
I managed to set the SIS a schedule like this:
sis config -s sat@0,6-12/6 /vol/nfs1_temp_01schedule would be: day@scheduled hours,starttime-endtime/frequency
lanmand said this on March 30, 2011 at 8:55 am