ZFS: Grow/Shrink an existing zfs filesystem

ZFS: Grow/Shrink an existing zfs filesystem

# Tested on RHEL 6 & 7


# Choose the F.S. to resize and verify current size

zfs list
   NAME           USED  AVAIL  REFER  MOUNTPOINT
   c_pool         204K  19.6G    30K  /c_pool
   c_pool/zfs01    30K  1024M    30K  /zfs01
   c_pool/zfs02    30K  19.6G    30K  /filesystem02
   m_pool         100K  9.78G    30K  /m_pool


ZPOOL=c_pool
ZFS=zfs01


df -h /$ZFS
   Filesystem            Size  Used Avail Use% Mounted on
   c_pool/zfs01          1.0G  128K  1.0G   1% /zfs01



# Extend F.S. to 2GB

zfs set quota=2g $ZPOOL/$ZFS



# Check

zfs list
   NAME           USED  AVAIL  REFER  MOUNTPOINT
   c_pool         204K  19.6G    30K  /c_pool
   c_pool/zfs01    30K  2.00G    30K  /zfs01
   c_pool/zfs02    30K  19.6G    30K  /filesystem02
   m_pool         100K  9.78G    30K  /m_pool


df -h /$ZFS
   Filesystem            Size  Used Avail Use% Mounted on
   c_pool/zfs01          2.0G  128K  2.0G   1% /zfs01



# Reduce F.S. back to 1GB

zfs set quota=1g $ZPOOL/$ZFS



# Check

zfs list
   NAME           USED  AVAIL  REFER  MOUNTPOINT
   c_pool         204K  19.6G    30K  /c_pool
   c_pool/zfs01    30K  1024M    30K  /zfs01
   c_pool/zfs02    30K  19.6G    30K  /filesystem02
   m_pool         100K  9.78G    30K  /m_pool



df -h /$ZFS
   Filesystem            Size  Used Avail Use% Mounted on
   c_pool/zfs01          1.0G  128K  1.0G   1% /zfs01



# Here is what happens if we fill up a little bit our filesystem and then try to reduce it
# below the boundary of used space

df -h /$ZFS
   Filesystem            Size  Used Avail Use% Mounted on
   c_pool/zfs01          1.0G  350M  675M  35% /zfs01


zfs set quota=256m $ZPOOL/$ZFS
   cannot set property for 'c_pool/zfs01': size is less than current used or reserved space
0 (0)
Article Rating (No Votes)
Rate this article
Attachments
There are no attachments for this article.
Comments
There are no comments for this article. Be the first to post a comment.
Full Name
Email Address
Security Code Security Code
Related Articles RSS Feed
Find All Large Files On A Linux System
Viewed 1715 times since Mon, Oct 29, 2018
Exclude multiple files and directories with rsync
Viewed 1914 times since Wed, Oct 31, 2018
Linux - How to get CPU information
Viewed 1585 times since Fri, Jun 8, 2018
LVM: Reduce SWAP size by removing a Logical Volume
Viewed 1645 times since Sat, Jun 2, 2018
List of 10 Must Know Oracle Database Parameters for Database Administrator
Viewed 112443 times since Thu, Jun 21, 2018
Turbocharge PuTTY with 12 Powerful Add-Ons – Software for Geeks #3
Viewed 14052 times since Sun, Sep 30, 2018
Super Grub2 Disk
Viewed 2929 times since Wed, May 22, 2019
ubuntu How to reset lost root password on Ubuntu 16.04 Xenial Xerus Linux
Viewed 7795 times since Tue, Dec 8, 2020
How to create a Systemd service in Linux
Viewed 2224 times since Mon, Dec 7, 2020
FIO (Flexible I/O) – a benchmark tool for any operating system
Viewed 18897 times since Wed, Jul 25, 2018