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 or more disks as coffer disks. Table 4-49 describes capacity partitions of the built-in coffer disks.
Built-in Coffer Disk |
5300 V3 |
5500 V3 |
5600 V3 |
5800 V3 |
6800 V3 |
Description |
|---|---|---|---|---|---|---|
Size |
1 x 64 GB SSD |
1 x 64 GB SSD disk |
1 x 64 GB SSD disk |
2 x 64 GB SSDs |
1 x 200 GB SSD |
- |
Cache dirty data partition |
21 GB |
21 GB |
32 GB |
32 GB |
64 GB |
Stores the cache dirty data that has not been written into a disk when the storage system is powered off. |
OS system partition |
8 GB |
Stores the OceanStor OS system data. |
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Cluster Configuration Database (CCDB) partition |
2 GB |
Stores the user configuration information (such as user configuration data of remote replication, HyperMetro, and NAS data). |
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LogZone partition |
2 GB |
Stores system logs and run logs when the storage system is powered off and write through is enabled. |
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DB partition |
1 GB |
Stores the user configuration information (such as information about the LUN capacity, ID, WWN, Fibre Channel ports, and iSCSI ports). |
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External Coffer Disk
If a storage system employs the disk and controller separation architecture, the first four disks in the first disk enclosure are configured as coffer disks. If a storage system employs the disk and controller integration architecture, the first four disks in the storage system are configured as coffer disks. SAS, NL-SAS, or SSD disks can be used as coffer disks. The type of the four coffer disks must be the same.
Appearance
Figure 4-105 and Figure 4-106 show the appearance of a coffer disk.
1 |
Disk module label |
2 |
Disk module handle |
3 |
Coffer disk label |
4 |
Disk module latch |
5 |
Alarm/Location indicator of the disk module |
6 |
Running indicator of the disk module |
7 |
Disk tray |
8 |
Disk |
Positions
- If a storage system employs the disk and controller integration architecture, the first four disks in the storage system are configured as coffer disks. Figure 4-107 uses a 2 U controller enclosure with 25 disk slots as an example.
- If a storage system employs the disk and controller separation architecture, the first four disks in the first disk enclosure are planned as coffer disks. Figure 4-108 uses a 2 U disk enclosure with 25 disk slots as an example.
In OceanStor 6800 V3, the first four disks in the first disk enclosure connected to controllers A and B are coffer disks, and the first four disks in the first disk enclosure connected to controllers C and D are coffer disks.
Capacity partitions: For the four disks, each spares 5 GB of space to form a RAID 1 group. The rest of the coffer disk space can be used to store service data. Table 4-50 describes capacity partitions of external coffer disks.
Partition Name |
Partition Size |
Description |
|---|---|---|
CCDB partition |
2 GB |
Stores the user configuration information (such as user configuration data of remote replication, HyperMetro, and NAS data). 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. |
