Specifications

NetApp Deduplication for FAS and V-Series Deployment and Implementation Guide
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11 TROUBLESHOOTING
This section covers issues that occasionally come up when configuring and running deduplication.
11.1 LICENSING
Make sure that deduplication is properly licensed and, if the platform is not an R200, make sure that the
NearStore option is also properly licensed:
fas3070-rtp01> license
…
a_sis <license key>
nearstore_option <license key>
…
If licensing is removed or expired, no additional deduplication can occur, and no sis commands can run.
However, the flexible volume remains a deduplicated volume, the existing storage savings are kept, and all
data is usable.
Deduplication must be disabled before removing the deduplication license. Before removing the
deduplication license, you must disable deduplication on all the flexible volumes, using the sis off
command. If you attempt to remove the license without first disabling deduplication, you will receive a
warning message asking you to disable this feature. Note: Any volume deduplication that occurred before
removing the license will remain unchanged.
11.2 VOLUME SIZES
From a deduplicated volume size limit perspective, a volume cannot exceed the size limit for the entire life of
the volume (that is, if a volume is larger than the maximum size and is then shrunk, you still cannot enable
deduplication on that volume). If you need to run deduplication on a volume that was (at some point in time)
larger than the maximum supported size, you can do so by creating a new volume and migrating the data
from the old volume to the newly created volume.
Here is an example of the message displayed if the volume is, or has been, too large to enable
deduplication:
london-fs3> sis on /vol/projects
Volume or maxfiles exceeded max allowed for SIS: /vol/projects
11.3 LOGS AND ERROR MESSAGES
The location of the deduplication log file is:
/etc/log/sis
Error messages with explanations:
Registry errors: Check if vol0 is full (only in Data ONTAP 7.2.X).
Metafile op errors: Check if the deduplicated volume is full (in Data ONTAP 7.2.X).
Metafile op errors: Check if the deduplicated aggregate is full (in Data ONTAP 7.2.X).
License errors: Check if the license is installed.
Change log full error: Perform a sis start operation to empty the change log metafile when finished
11.4 NOT SEEING SPACE SAVINGS
If you’ve run deduplication on a flexible volume that you’re confident contains data that should deduplicate
well, but you are not seeing any space savings, there’s a good chance that a bunch of Snapshot copies exist