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--- computing:zfsreminders [2022/08/05 00:22] – created oemb1905
+++ computing:zfsreminders [2024/04/21 23:12] (current) – oemb1905
@@ Line 1: / Line 1: @@
-Rename zpool
+-------------------------------------------
+  * **zfsreminders**
+  * **Jonathan Haack**
+  * **Haack's Networking**
+  * **webmaster@haacksnetworking.org**
+-------------------------------------------
+//zfsreminders//
+-------------------------------------------
+Create a pool on a single drive and specify a mountpoint for it. Note: use id, not uuid.
+  zpool create -m /mnt/Pool Pool -f /dev/disk/by-id/b592...
+If you have more than one drive to begin with, you can make mirrors as follows:
+  zpool create -m /mnt/Pool Pool -f mirror /dev/disy/by-id/2323... /dev/disy/by-id/3232...
+If you accidentally used short names, then export and import to change it asap like this:
+  zpool export vms
+  zpool import -d /dev/disk/by-id vms
+If you messed up and picked a wrong name and/or mountpoint, adjust later as follows. To rename:
   zpool export [pool_name]
   zpool import [original_pool_name] [new_pool_name]
-Change mountpoint
+To change mountpoint:
   zfs set mountpoint=/myspecialfolder mypool
-Adding another drive to an existing single-drive zfs pool to form a mirror:
+If you now have more than one drive, add another drive as a mirror as follows:
   zpool attach nameofpool /dev/disk/by-id/currentdisk /dev/disk/by-id/newdisk
+To create an encrypted dataset you generate a key and then specify the location and name of the pool as follows:
+  dd if=/dev/random of=/secure/area/example.key bs=1 count=32
+  zfs create -o encryption=on -o keyformat=raw -o keylocation=file:///mnt/vault/example.key pool/dataset
+After reboot, import (mount), the data set as follows:
+  zfs load-key pool/dataset
+  zfs mount pool/dataset
+If you need to delete a dataset, do the following:
+  zfs destroy -r pool/dataset
+To create snapshots, here is a reasonable template:
+  DATE=`date +"%Y%m%d-%H:%M:%S"`
+  /usr/sbin/zfs snapshot -r pool/dataset@backup_$DATE
+To delete all snapshots and start over:
+  zfs list -H -o name -t snapshot | xargs -n1 zfs destroy
+To add a zfs cache or slog hard drive to your pool, do the following:
+  zpool add pool cache /dev/disk/by-id/3434...
+  zpool add pool log /dev/disk/by-id/3434...
+To view current snapshots, do the following:
+  zfs list -r -t snapshot -o name,creation pool/dataset
+  zfs list -r -t snapshot -o name,creation pool
+To view pool space, including snapshots, do the following:
+  zfs list -ro space
+To replace a failed drive, power down the host, remove drive, reboot, get ''by-id'' of the new drive, and run ''zpool status -v'' for hard drive number of old drive, then do:
+  sudo zpool replace pool <hard-drive-number> /dev/disk/by-id/</dev/disk/by-id/newdrive>
+  sudo zpool replace pool 3347762980558930904 /dev/disk/by-id/ata-WDC_WD...
+To check the health, statistics, and basic specs of your pool:
+  zpool status -v
+  zpool iostat -v
+  zpool list -v
+Also, to see whether cache volume is necessary, run and look at cache hit/miss ratio:
+  arc_summary
+Change location of the keys for your encrypted datasets:
+  sudo zfs set keylocation=file:///keys/my.key mypool/mydataset
+Send and receive entire pool to new pool
+  zfs snapshot -r pool1@latestsnap
+  zfs send -R pool1@latestsnap | zfs receive -F pool2
+Arc information
+  arcstat
+  arc_summary -d | less
+  nano /etc/modprobe.d/zfs.conf
+  <# 8GB example - 8*(2^30) = below>
+  <#options zfs zfs_arc_max=8589934592>
+  <# Set Max ARC size => 2GB == 2147483648 Bytes>
+  <options zfs zfs_arc_max=2147483648>
+  <# Set Min ARC size => 1GB == 1073741824>
+  <options zfs zfs_arc_min=1073741824>
+  cat /sys/module/zfs/parameters/zfs_arc_min
+  cat /sys/module/zfs/parameters/zfs_arc_max
+More examples ...
+ --- //[[webmaster@haacksnetworking.org|oemb1905]] 2024/04/21 23:12//

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