Functions of a controller

1

A controller has the following functions:
A controller is the core component of a storage system. It processes storage services, receives configuration management commands, saves configuration data, connects to disk enclosures, and saves critical data onto coffer disks.

Other related questions:
Functions of license control items on firewalls
Functions of license control items on firewalls are as follows: -Function: A license control item controls whether a function of a product is available. The function can be used only after the license file is successfully loaded. -Resource: A license control item controls the maximum number of resources used by a certain function of a product. Without the license, the function can be used with only limited resources. -Upgrade service: A license control item controls the upgrade service of a certain product function. The upgrade service is provided for the function only after the license file is successfully loaded.

Functions of USG firewalls controlled by a license
The license control items of the USG2000, USG5000, and USG6000 series are different. 1. License control items of the USG5500: Number of virtual firewalls, number of concurrent SSL VPN users, intrusion prevention system (IPS), anti-virus (AV), real-time blackhole list (RBL) for spams, remote query of URL predefined category, mail content filtering, web content filtering, search keyword filtering, FTP filtering, and GTP 2. License control items of the USG2110-X, USG2100, USG2200, USG5100, USG2200, and USG 5100 HSR: Number of virtual firewalls, number of concurrent SSL VPN users, IPS, AV, RBL for spams, remote query of URL predefined category, mail content filtering, web content filtering, search keyword filtering, and FTP filtering 3. License control items of the USG6000 series: Number of virtual systems, number of concurrent SSL VPN users, content security combination (file type filtering, content filtering, application behavior control, mail filtering, and auditing), IPS, AV, remote query of URL predefined category, and encryption algorithms approved by the State Password Administration Committee Office (SM2, SM3, and SM4)

Memory function of RAID controller card
1. If the LSISAS2208/LSISAS3108 RAID controller card is configured with a battery or supercapacitor, data is written into the cache first. When the data volume in the cache reaches its limit, data is written into hard disks in sequence, greatly improving the access speed of small files. Cache is volatile storage. If it does not have a battery or supercapacitor, its data will be lost when the server is powered off. This may cause data inconsistency. For example, when a data record is written into the database, the RAID controller card stores the data record in cache first. However, at that time, the data record has not been written onto hard disks. If the server is powered off at that time, the data record will be lost and cannot be found in the database when required. The database keeps searching for the data endlessly. In extreme conditions, the database may crash. The battery or supercapacitor can prevent data loss in power failures. When a server is powered off unexpectedly, the batter or supercapacitor provides power to the RAID controller card. 2. If the LSISAS2208/LSISAS3108 RAID controller card does not have a battery or supercapacitor, data is directly written into hard disks.

If you have more questions, you can seek help from following ways:
To iKnow To Live Chat
Scroll to top