Fingerprint Bucket Capacity, Deduplication Ratio and Effective Deduplication Space Range

little_fish · Created Feb 3, 2020 03:04:40

Hello Phany,

Here are some notes about this question.

1. Data fingerprint is used by storage arrays to search for data addresses. Memory of Dorado caches the fingerprint of each data block. Deduplication refers to the process of sharing the same fingerprint for identical data blocks.

2. The space of cached fingerprint is limited in the memory. Therefore, deduplication has limited valid space. Once valid deduplication space is used up, data will not be deduplicated.

3. A higher deduplication rate means a higher fingerprint reuse rate and larger valid deduplication space and vice versa.

The following table lists valid deduplication space for Dorado V3 of different versions.

Product Model	Memory (per controller)	Fingerprint Table Size	1:1 Valid Deduplication Space	3:1 Valid Deduplication Space	10:1 Valid Deduplication Space
Dorado5000 V3 SAS version	128 GB	16 GiB	22 TB	66 TB	220 TB
Dorado5000 V3 NVMe version	256 GB	32 GiB	45 TB	135 TB	450 TB
Dorado6000 V3 SAS version	256 GB	32 GiB	45 TB	135 TB	450 TB
Dorado6000 V3 SAS version	512 GB	60 GiB	85 TB	255 TB	850 TB

I hope it is helpful to you!

little_fish · Created Feb 3, 2020 03:04:40

Hello Phany,

Here are some notes about this question.

1. Data fingerprint is used by storage arrays to search for data addresses. Memory of Dorado caches the fingerprint of each data block. Deduplication refers to the process of sharing the same fingerprint for identical data blocks.

2. The space of cached fingerprint is limited in the memory. Therefore, deduplication has limited valid space. Once valid deduplication space is used up, data will not be deduplicated.

3. A higher deduplication rate means a higher fingerprint reuse rate and larger valid deduplication space and vice versa.

The following table lists valid deduplication space for Dorado V3 of different versions.

Product Model	Memory (per controller)	Fingerprint Table Size	1:1 Valid Deduplication Space	3:1 Valid Deduplication Space	10:1 Valid Deduplication Space
Dorado5000 V3 SAS version	128 GB	16 GiB	22 TB	66 TB	220 TB
Dorado5000 V3 NVMe version	256 GB	32 GiB	45 TB	135 TB	450 TB
Dorado6000 V3 SAS version	256 GB	32 GiB	45 TB	135 TB	450 TB
Dorado6000 V3 SAS version	512 GB	60 GiB	85 TB	255 TB	850 TB

I hope it is helpful to you!

Phany · Created Feb 3, 2020 03:44:43

Posted by little_fish at 2020-02-03 03:04 Hello Phany,Here are some notes about this question.1. Data fingerprint is used by s ...

Hi, can you explain how to ensure deduplication effect if the valid deduplication space is smaller than the capacity?

little_fish · Created Feb 3, 2020 03:47:51

Posted by Phany at 2020-02-03 03:44 Hi, can you explain how to ensure deduplication effect if the valid deduplication space is smaller ...

Data deduplication requires that data blocks are identical and applies to VDI and VSI system disks. The deduplication rate of system disks is usually much greater than 10. A higher deduplication rate means a higher fingerprint bucket capacity rate. Therefore, the deduplication effect can be guaranteed.

NACA4412 · Created Feb 21, 2020 21:07:35

Interesting, please share if you solve this

Fingerprint Bucket Capacity, Deduplication Ratio and Effective Deduplication Space Range

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Fingerprint Bucket Capacity, Deduplication Ratio and Effective Deduplication Space Range

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