quickreference:zfs
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| quickreference:zfs [2022/12/06 18:56] – [Useful commands] rodolico | quickreference:zfs [2025/01/06 23:05] (current) – [Create a zpool] rodolico | ||
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| zpool create -f storage raidz2 / | zpool create -f storage raidz2 / | ||
| </ | </ | ||
| + | |||
| + | You can add extra functionality by creating //intent//, //dedup// and //cache// vdev's at the same time. Following example shows adding a vdev (mirror) to a pool. | ||
| + | <code bash> | ||
| + | zpool create -f -m /storage storage raidz2 da4 da5 da6 da7 da8 da9 dedup mirror da2 da3 | ||
| + | </ | ||
| + | |||
| + | This will create a pool named storage, mounted (-m) at /storage, forced to ignore most drive errors. The pool will be a raidz2 (aka RAID 6) with 6 drives (4-9), and have a dedup vdev consisting of a mirror from da2 and 3. | ||
| ===== Create a Dataset ===== | ===== Create a Dataset ===== | ||
| Line 56: | Line 63: | ||
| # turn swap back on (could also use swapon / | # turn swap back on (could also use swapon / | ||
| swapon -aL | swapon -aL | ||
| + | </ | ||
| + | |||
| + | ===== Using a file for swap space ===== | ||
| + | |||
| + | Instead of using a swap partition or zvol, we can simply use a file. In this case, we can add swap space by deleting/ | ||
| + | |||
| + | Following code creates an 8G swap file. Note that after reading https:// | ||
| + | |||
| + | <code bash> | ||
| + | # create an 8G swap file | ||
| + | dd if=/ | ||
| + | # set permissions | ||
| + | chmod 0600 /swap | ||
| + | # look for an unused md device (ie, not listed) | ||
| + | mdconfig -lv | ||
| + | cp /etc/fstab / | ||
| + | # edit /etc/fstab and add the following line, using the correct md## | ||
| + | joe /etc/fstab | ||
| + | md42 none swap sw, | ||
| + | # save your file | ||
| + | # turn on swap | ||
| + | swapon -aq | ||
| + | # look at swap information | ||
| + | swapinfo -k | ||
| </ | </ | ||
| ===== iSCSI considerations ===== | ===== iSCSI considerations ===== | ||
| + | |||
| + | On FreeBSD, the iSCSI config is / | ||
| iSCSI generally uses volumes which are then exported by the target. I have found that it is useful, from a management perspective, | iSCSI generally uses volumes which are then exported by the target. I have found that it is useful, from a management perspective, | ||
| Line 68: | Line 101: | ||
| <code bash> | <code bash> | ||
| zfs create storage/ | zfs create storage/ | ||
| - | zfs -V 10G storage/ | + | zfs create |
| - | zfs -V 10G storage/ | + | zfs create |
| </ | </ | ||
| Line 85: | Line 118: | ||
| - detach from iSCSI initiator (not sure if this is required) | - detach from iSCSI initiator (not sure if this is required) | ||
| - On iSCSI target | - On iSCSI target | ||
| - | - edit config | + | - Rename the volume |
| - | - <code zfs rename storage/ | + | - Edit the config to point to new location (**/ |
| - | - reload iscsi service | + | - reload iscsi service |
| - On initiator | - On initiator | ||
| - rescan target | - rescan target | ||
| - allow access to volume | - allow access to volume | ||
| - | I have **NOT** done this yet. This is based on some research I have done, and a little testing, so use at your own risk. | + | |
| ===== Getting and setting properties ===== | ===== Getting and setting properties ===== | ||
| Line 140: | Line 173: | ||
| ===== Useful commands ===== | ===== Useful commands ===== | ||
| - | * Create a snapshot of path/ | + | * Create a snapshot of **path/ |
| * List all snapshots in a particular tree. gives USED (space used by snapshot) and REFER (data referred to in original set)< | * List all snapshots in a particular tree. gives USED (space used by snapshot) and REFER (data referred to in original set)< | ||
| * Remove an existing snapshot (use above command to find the correct name)< | * Remove an existing snapshot (use above command to find the correct name)< | ||
| Line 156: | Line 189: | ||
| * https:// | * https:// | ||
| * https:// | * https:// | ||
| + | * https:// | ||
quickreference/zfs.1670374566.txt.gz · Last modified: 2022/12/06 18:56 by rodolico