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66
U Series User Manual
Deduplication size limit*: dedup performance is highly dependent on the size of memory.
When the size limit has reached, deduplication function on all storage pools will be disabled
automatically and grey out.
Memory size
Deduplication size limit
4GB
87GB
8GB
137GB
16GB
371GB
*
Starting from FW1.0.3, there will be deduplication size limit imposed on enabling deduplication to
avoid performance degradation.
Deduplication size limit can be removed by the following means :
。
Per pool basis. Add read cache (L2ARC) using SSD drives provided by JetStor
Technology.
。
Per system basis. Add more memory to the system or delete deduplicated data to
release space.
How to check deduplication size limit?
1.
Go to Summary/Overview tab, dedup usage number will be shown here.
2.
Check deduplication ratio. Dedup ratio is displayed along with pool information. It
represents the overall amount of deduplicated data from all file systems and volumes in
the same pool.
Dedup Ratio = (Data size before dedup) / (Data size after dedup)
From the screenshot in step 1 above, 7564MB (7GB) is the data size after dedup.