Whether hard disks of different capacities can be used together

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Hard disks of different capacities can be used together on a server. However, it is not recommended that hard disks of different capacities be put in the same RAID group.

Other related questions:
Hard disk capacity of servers
For details about the hard disk types and capacities, see the server compatibility list.

Whether hardware configuration can be modified for servers
Server components that are in the compatibility list support hardware upgrade and configuration modification.

Hard disk capacity expansion for the USG6000 series
The USG6650/6660/6670/6680 supports dual hard disks. Do as follows to install a hard disk on the USG, which has been running for some time with a single hard disk: 1. Ensure that all configurations are saved. 2. Run the disk offline command in the system view. Wait for about 30 seconds until the system indicates that the hard disk stops working, remove the filler panel from the hard disk slot, and install a new hard disk unit. a. Remove the filler panel from the hard disk slot. HDD1 is used as an example. b. Hold the handlers of the tray and push the tray along the guide rails inside the hard disk slot till the tray panel aligns with the panel of the device. c. Press the tray handler inwardly to restore the tray. d. In the system view, run the reset raid primary-disk disk-id command to create a RAID group using disk-id as the primary disk for data synchronization. In this example, the command shall be reset raid primary-disk 0. Several hours later, run the display disk information command. If Filesystem Status is Mounted and DiskRaidMode is ACTIVE, both hard disks work properly. Note: After the RAID is created, the data in the active disk will be synchronized to the backup disk and the original data on the backup disk will be overwritten. Select the disk-id of the active disk before creating RAID.

Method of calculating the available capacity before configuring RAID
1. You can view the available capacity during RAID array configuration. 2. You can also estimate the ? RAID 0: 100% ? RAID 1: 50% ? RAID 5: (N-1)/N ? RAID 6: (N-2)/N ? RAID 10: 50% ? RAID 1E: (N+1)/2N ? RAID 50: (N-M)/N ? RAID 60: (N-M*2)/N N indicates the number of member hard disks in a RAID array. M indicates the number of sub-groups of a RAID array. For example, if three 300 GB disks are used to create a RAID 5 array, Disk usage rate: (3-1)/3 = 2/3 Available capacity of the RAID 5 array: 3 x 300 x 2/3 = 600 GB

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