Memory function of RAID controller card

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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.

Other related questions:
RAID controller card
For details about RAID controller cards supported by Huawei servers, enter a product model + RAID controller card; for example, RH2288 V3 RAID controller card.

What is the function of the RAID controller card in the RH2288 V3
The RH2288 V3 supports the following models of RAID controller cards: SR320: Uses the LSISAS2208 chip. Supports RAID 0, 1, 10, 5, 50, 6, and 60. Provides a supercapacitor to protect cache data from power failures. SR120: Uses the LSISAS2308 chip. Supports RAID 0, 1, 1E, and 10. Does not protect cache data from power failures. SR130: Uses the LSISAS3008 chip. Supports RAID 0, 1, 1E, and 10. Does not protect cache data from power failures. SR430C: Uses the LSISAS3108 chip. Supports RAID 0, 1, 10, 5, 50, 6, and 60. Provides a supercapacitor to protect cache data from power failures. Supports a maximum of 32 hard disks. Provides 1 GB or 2 GB cache. SR135: Uses the PM8068 chip. Supports RAID 0, 1, 10, and 5. Does not protect cache data from power failures. These RAID controller cards support RAID state migration, RAID configuration memory, and web-based remote configuration.

What is the function of the RAID controller card in the RH1288 V3
The RH1288 V3 supports the following models of RAID controller cards: SR320: Uses the LSISAS2208 chip. Supports RAID 0, 1, 10, 5, 50, 6, and 60. Provides a supercapacitor to protect cache data from power failures. SR120: Uses the LSISAS2308 chip. Supports RAID 0, 1, 1E, and 10. Does not protect cache data from power failures. SR130: Uses the LSISAS3008 chip. Supports RAID 0, 1, 1E, and 10. Does not protect cache data from power failures. SR430C: Uses the LSISAS3108 chip. Supports RAID 0, 1, 10, 5, 50, 6, and 60. Provides a supercapacitor to protect cache data from power failures. Supports a maximum of 32 hard disks. Provides 1 GB or 2 GB cache. SR135: Uses the PM8068 chip. Supports RAID 0, 1, 10, and 5. Does not protect cache data from power failures. These RAID controller cards support RAID state migration, RAID configuration memory, and web-based remote configuration.

Functions of the TFM configured for LSISAS 2208 RAID controller cards
The TFM configured for LSISAS 2208 RAID controller cards is used to protect data in case of power failures. If this function is not required, you do not need to configure the TFM. LSISAS 2208 RAID controller cards will work properly without the TFM. The working principles of the TFM are as follows: During a power failure, data in the cache of an LSISAS 2208 RAID controller card is synchronized to the TFM, and supercapacitors are used to power the synchronization process. The TFM supports data recovery in various power failure scenarios.

Necessity of configuring RAID arrays for a RAID controller card
If the LSISAS1078, LSISAS2208, or LSISAS3108 RAID controller card is used, the disks can be recognized by the system only when they are in RAID arrays. If the LSISAS1068, LSISAS2308, or LSISAS3008 RAID controller card is used, the disks can be used as individual disks for OS installation, if they are not in RAID arrays.

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