8 zfs

bucde edited this page 2022-11-10 12:43:59 +00:00

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Table of Contents

• ZFS
• Create ZPOOL
• ZPOOL compression
• Create ZVOL
• Create datastore
• Set quota for datastore
• Adjust ZFS cache

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ZFS

Create ZPOOL

• -m <MOUNTPOINT> set the mountpoint (default is /<POOLNAME>)
• -o ashift=12 set blocksize to 4k
• <POOLNAME> name of the pool to be created
• <RAIDLEVEL> can be
  • LEAVE_EMPTY for striped group
  • mirror for mirrored group
  • raid10 for stripped mirror
  • raidz for single parity (like RAID5)
  • raidz2 for dual parity (like RAID5 with dual parity)
• <DISK_x> list of all disks to be used for the new pool
  • for unique identification you should use the disk ids /dev/disk/by-id/<DISK_ID>
  • e.g. /dev/disk/by-id/ata-HGST_HTS725050A7E630_TF0500WJ09RMZL

zpool create -m <MOUNTPOINT> -o ashift=12 <POOLNAME> <RAIDLEVEL> <DISK_1> <DISK_2> ... <DISK_n>

ZPOOL compression

Enable compression for ZPOOL with:

zfs set compression=lz4 <POOLNAME>

Create ZVOL

• -s thin zfs volume
• -v verbose
• -V <BYTES> size of the new zfs volume
• <POOLNAME> name of existing pool
• <ZVOLNAME> name of the new zfs volume

zfs create -s -v -V <BYTES> <POOLNAME>/<ZVOLNAME>

Create datastore

• -o mountpoint=<MOUNTPOINT> set the mountpoint (default is /<POOLNAME>/<DATASTORENAME>)
• <POOLNAME> name of existing pool
• <DATASTORENAME> name of the new datastore

zfs create –o mountpoint=<MOUNTPOINT>  <POOLNAME>/<DATASTORENAME>

Set quota for datastore

• <SIZE> quota size (you can use M or G)
• <POOLNAME> name of existing pool
• <DATASTORE> name of existing datastore

zfs set quota=<SIZE> <POOLNAME>/<DATASTORE>

Adjust ZFS cache

In this example we set the ZFS cache to 4G (4294967296 bytes). Create or extend the file /etc/modprobe.d/zfs.conf with the following:

options zfs zfs_arc_min=4294967295
options zfs zfs_arc_max=4294967296

Save the file and update-initramfs -u -k all

Reboot the system.

You can show statistics with arc_summary.