Requirements and Configuration of Storage Nodes

Supported Operating Systems for Storage Nodes

The storage node operating system must have LVM installed.

Hardware Configuration for Storage Nodes

Storage Node Memory Configuration Parameters

SSD is a service running on the storage node responsible for receiving backup data, writing to storage, and reading from storage for data restoration. Appropriate parameters can be configured based on the memory size of the storage node. The parameter file is located at <installation directory>/config/ssd.json。

[root@sn ~]# cat /opt/unispace/config/ssd.json 
{
	"csd_port": 9000,
	"csd_ip": "127.0.0.1",
	"max_buffer_size": 1000,
	"max_backup_stream_count": 200,
	"max_buffer_size_per_stream": 5,
	"enable_memory_pool_debug" : "false",
	"enable_memory_pool" : "false",
	"temp_path" : "/opt/unispace/ssd_temp"
}

max_buffer_size：The maximum memory that SSD can use, in MB. The default value is 1G. It can be configured to 40%–60% of the total memory of the storage node.
max_backup_stream_count：The maximum number of concurrent streams supported by this node.

Recommended Configuration for Storage Node Kernel Parameters

Execute the following command to make the changes take effect temporarily:

sysctl -w net.core.optmem_max = 81920
sysctl -w net.core.rmem_max = 2147483647
sysctl -w net.core.wmem_max = 2147483647
sysctl -w net.ipv4.tcp_rmem = "4096		87380	2147483647"
sysctl -w net.ipv4.tcp_wmem = "4096		65536	2147483647"

Edit the system file and append the following parameters:

sysctl -w net.core.optmem_max = 81920
sysctl -w net.core.rmem_max = 2147483647
sysctl -w net.core.wmem_max = 2147483647
sysctl -w net.ipv4.tcp_rmem = "4096		87380	2147483647"
sysctl -w net.ipv4.tcp_wmem = "4096		65536	2147483647"