## ZFS
```
zpool status -v #shows zpool status infos

zpool iostat 1 #shows IOps and R/W bandwidth every second

zfs list -t snapshot #lists all the snapshots, add | grep "" to filter

arc_summary.py #shows ARC stats

arcstat.py #shows ARC stats

zdb -C your_pool_name | grep ashift #shows the ashift value

```

## Feature Flags
```
man zpool-features  #To see the Feature Flags supported by the version of ZFS you're running

zpool get all poolname | grep feature  #To view the status of Feature Flags on a pool

zpool upgrade   #To view available Feature Flags

zpool upgrade poolname   #Feature Flags can be enabled

zpool import -o feature@feature_name=enabled poolname   #Feature flags can be selectively enabled at import time

https://forums.freenas.org/index.php?resources/zfs-feature-flags-in-freenas.95/
```




## Smart
```
smartctl -h #shows smart control help, lots of commands examples

smartctl -a /dev/daX #shows all smart attributes

smartctl -A /dev/daX #same as -a but without vendor infos, last test infos, ...

smartctl -l selftest /dev/daX #shows result of last smart test

smartctl -l scttemp /dev/daX #shows the temperatures history

smartctl -t long /dev/daX #executes a long test (replace "long" by "short" for a short test)
```



## HDD
```
glabel status  #shows gptids and devices names

gstat -f daX -I 1000ms #shows IOps and R/W bandwidth every second

iostat daX #shows IOps and R/W bandwidth
```



## HBA
```
dmesg | grep mps #used to check FW and driver versions on HBA cards using the mps driver
```



**UPS**
```
upsc ups #shows all ups attributes (change "ups" with your ups name)
```



**Misc**
```
kldload ipmi.ko #loads ipmitool
ipmitool sensor #shows all ipmi sensors values

systat -vm #shows system infos (cpu load, ram usage, drives I/O, ...)

dmidecode | more #shows all hardware bios infos

cat /var/log/messages | more #shows the log (same as in the GUI footer)

freenas-debug -h more /var/tmp/fndebug #shows all debug infos

camcontrol devlist #shows all devices

usbconfig #shows all usb devices
```



**Burn-in/Benchmark**
```
dd if=/dev/zero of=/mnt/tank/tmp.zero bs=2048k count=50k #disable shares and compression for the test!!!
dd if=/mnt/tank/tmp.zero of=/dev/null bs=2048k count=50k #disable shares and compression for the test!!! don't forget to delete tmp.zero after

diskinfo -t daX #test seek and transfer times

for i in 1 2 3 4; do while : ; do : ; done & done #cpu burn test for 4 threads
```