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NAS 202

Using SSD Caching on an ASUSTOR NAS

Using SSD Caching on an ASUSTOR NAS

2019-06-12

COURSE OBJECTIVES

Upon completion of this course you should be able to:

Set up SSD Caching on an ASUSTOR NAS.

PREREQUISITES

Course Prerequisites:

N/A

Students are expected to have a working knowledge of:

N/A


OUTLINE

1. How to use SSD Caching
1.1. Setting up Read Only mode
1.2. Setting up Read/Write mode
1.3. Notes:
2. Supported models


1. How to use SSD Caching

There are two SSD cache modes – Read/Write and Read Only.

Read Only mode is best when only one SSD is installed. In the event of SSD failure, Read Only mode avoids data loss by keeping all data on the hard drives. Read/Write mode provides faster write speeds and is best if two SSDs are installed to protect against data loss if one fails.

1.1 Setting up Read Only mode

Install an SSD into a NAS. Open Storage Manager, and click on Volume. Click Management and select SSD Cache. In the Creation Wizard, please select Read Only mode and allocate SSD cache capacity.


Figure 1. Selecting a volume and SSD Cache mode in Storage Manager.

Figure 2. Read Only mode is only available if one SSD is installed.


Figure 3. SSD caching is enabled.


1.2 Setting up Read/Write mode

Read/Write mode is available for NAS systems with two or more SSDs. If at least two SSDs are detected, the SSD Cache Creation Wizard will enable Read/Write mode. Select a volume and click SSD Cache under Management. In the SSD Cache Creation Wizard, please select Read/Write and allocate SSD cache capacity.

Figure 4. Select Read/Write mode when two or more SSDs are installed.



1.3 Notes:

(A) Every Gigabyte of Cache created requires a half Megabyte of RAM.

(B) Do not remove SSDs without ejecting safely. If SSD Caching is no longer required, the SSD must be ejected first before removal. Click SSD Cache under Management. Do not turn off the NAS before the ejection completes.

(C) After creating a cache, click SSD Cache under Management to check cache usage. A read hit rate will be displayed and a higher rate indicates higher efficiency. 100% is the maximum.

(D) Skipping sequential I/O will write sequential data to the hard drives. To attain better performance in reading random non-sequential data on the SSD rather than the hard drives, it is better to write sequential data into the hard drives and random non-sequential data to SSD to achieve the best efficiency and performance.

2. Supported models

Currently SSD Cache is supported on: AS31/32/40/50/51/61/62/63/64/70/Nimbustor series

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