Coffer Disk
The storage system has two kinds of coffer disks: built-in coffer disk and external coffer disk. Coffer disks are used to store three types of data: cache data requiring power failure protection, OceanStor OS system data, and system configuration information and logs.
Built-in Coffer Disk
Each controller houses one M.2 SATA disk (64 GB) to store system data. The flushing speed of the disk is 70 MB/s. Table 4-16 describes capacity partitions of the built-in coffer disks.
Partition Name |
Partition Size |
Description |
|---|---|---|
Cache dirty data partition |
9.5 GB |
Stores the cache dirty data that has not been written into a disk when the storage system is powered off. |
OS system partition |
32 GB |
Stores the OceanStor OS system data. |
CCDB partition |
3 GB |
Stores the user configuration information (such as user configuration data of features). |
LogZone partition |
2 GB |
Stores system logs and run logs when the storage system is powered off and write through is enabled. |
DB partition |
1 GB |
Stores the user configuration information (such as information about the LUN capacity, ID, WWN, Fibre Channel ports, and iSCSI ports). |
External Coffer Disk
The first four disks in the storage system are configured as coffer disks. SAS disks can be used as coffer disks. The type of the four coffer disks must be the same.
Appearance
Figure 4-27 shows the appearance of a coffer disk.
Positions
Figure 4-28 shows the positions of the first four disks in the storage system.
Capacity partitions: For the four disks, each spares 6 GB of space to form a RAID 1 group. The rest of the coffer disk space can be used to store service data. Table 4-17 describes capacity partitions of external coffer disks.
Partition Name |
Partition Size |
Description |
|---|---|---|
CCDB partition |
3 GB |
Stores the user configuration information (such as user configuration data of features). The four coffer disks are mirrors of each other for redundancy. |
LogZone partition |
2 GB |
Stores system logs and run logs when the storage system is powered off and write through is enabled. The four coffer disks are mirrors of each other for redundancy. |
DB partition |
1 GB |
Stores the user configuration information (such as information about the LUN capacity, ID, WWN, Fibre Channel ports, and iSCSI ports). The four coffer disks are mirrors of each other for redundancy. |