executar o comando:
lspci -vv

e procurar no resultado o endereço do barramento, neste caso uma plava nvme pcie-e:

printf 'options zfs zfs_arc_max=2147483648' >> /etc/modprobe.d/zfs.conf
echo 3 > /proc/sys/vm/drop_caches

e para verificar:
cat /proc/spl/kstat/zfs/arcstats |grep c_

https://serverfault.com/questions/581669/why-isnt-the-arc-max-setting-h…

https://web.archive.org/web/20180303034326/http://www.tuxradar.com/cont…
https://dzone.com/articles/linux-pam-easy-guide

zpool create -o ashift=12 -O compression=lz4 -O dnodesize=auto -O normalization=formD -O relatime=on -O xattr=sa -O atime=off -O acltype=posixacl -O encryption=aes-256-gcm -O keylocation=prompt -O keyformat=passphrase tank0 mirror wwn-0x5000cca22dcbf093 wwn-0x5000cca22dd2fc89 mirror wwn-0x5000cca22dd31cdb wwn-0x5000cca22dd0624

https://www.howtoforge.com/tutorial/configure-postfix-to-use-gmail-as-a…
https://www.linode.com/docs/email/postfix/configure-postfix-to-send-mai…

systemctl stop pve-cluster
/usr/bin/pmxcfs -l

https://forum.proxmox.com/threads/one-node-cannot-initialize-cmap-servi…

https://forum.proxmox.com/threads/zfs-pool-configuration-same-name.5327…

xana-desktop:

./cdm_fio.sh .
Testing in .
Configuration: Size:1024m Loops:2 Write Only Zeroes:0
Running Benchmark, please wait...

Results:

Sequential Read: 1564MB/s IOPS=1
Sequential Write: 1272MB/s IOPS=1

512KB Read: 4830MB/s IOPS=9660
512KB Write: 3016MB/s IOPS=6032

Sequential Q32T1 Read: 1915MB/s IOPS=59
Sequential Q32T1 Write: 1229MB/s IOPS=38

4KB Read: 486MB/s IOPS=124533
4KB Write: 198MB/s IOPS=50739

4KB Q32T1 Read: 56MB/s IOPS=14421
4KB Q32T1 Write: 1MB/s IOPS=297

instalar:
apt install pdfgrep

pesquisar:
pdfgrep -i '0,250 POR CENTO' ./*

https://www.svennd.be/basic-zfs-tune-tips/
https://jrs-s.net/2018/08/17/zfs-tuning-cheat-sheet/

/etc/systemd/system/rc-local.service:

[Unit]
Description=/etc/rc.local Compatibility
ConditionPathExists=/etc/rc.local

[Service]
Type=forking
ExecStart=/etc/rc.local start
TimeoutSec=0
StandardOutput=tty
RemainAfterExit=yes
SysVStartPriority=99

[Install]
WantedBy=multi-user.target

systemctl enable rc-local
systemctl start rc-local.service
systemctl status rc-local.service

/etc/rc.local: