The /etc/zfs/zpool.cache file
$ zpool set cachefile=/etc/zfs/zpool.cache tank
$ zpool set cachefile=none tank
SR、LRM、LR、ER、ZR are terms used in fiber optic communications, stand for the transmission distance of the 10G modules.
SR stands for Short Range, these transceivers support link length of 300m over multi-mode fiber and use 850nm lasers.
LRM means Long Reach Multimode, these transceivers support distance up to 220m over multi-mode fiber and use 1310nm lasers.
LR means Long Reach, these transceivers support distance up to 10km over single mode fiber and use 1310nm lasers.
ER means Extended Reach, the data rate of these transceivers support distance up to 40km over single mode fiber and use 1550nm lasers.
ZR also stands for Extended Reach which can transmit 10G data rate and 80km distance over single mode fiber and use 1550nm lasers.
check the driver lists and set
only enterprise-class SSDs can be relied upon (at all) for safe behavior on power fail.
The enterprise-class SSDs have super-capacitors that store enough power to write all data stored in the RAM within the SSD on power fail, and vendors charge three times as much as they do for consumer class SSDs.
Some vendors do certify their SSDs, but you should check them under real power-fail conditions, like pulling the plug.
It is better to use an Arduino with a relay for experimenting with cutting off power.
you can use nmap to test open port gateway see below
or you can use nping as follows
snmpwalk -mALL -v1 -cpublic ip system
sysctl -w net.ipv4.ip_forward=1
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
If you want to enter the screen started by another user whose password you dont know
login as root or as sudo bash .
before screen -r SCREENNUM