This concise post aims to cover the basics of ZFS administration on Solaris. Excuse the brevity, it is for reference rather than a detailed explanation.
ZFS Pools
zpool list && zpool status rpool
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In a lab environment, files can replace actual physical disks
cd /dev/dsk && mkfile 200m disk {0..9}
Create a ZPool and Expand a ZPool
zpool create labpool raidz disk0 disk1 disk2 && zpool list && zpool list labpool
zpool add labpool raidz disk4 disk5 disk6 && zpool list && zfs list labpool
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ZFS Compression
zfs create labpool/zman && zfs set compression=gzip labpool/zman
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You can copy files to this zfs filesystem that has gzip compression enabled and save nearly half your disk space.
ZFS Deduplication
zfs create -o dedup=on -o compression=gzip labpool/archive
zfs create labpool/archive/a (b, c d)
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By copying multiple instances of the same file into /labpool/archive/a, b, c and d whereby the /labpool/archive filesystem has deduplication turned on, you’ll see that zpool list labpool will increment the value in the DEDUP column to reflect the deduplication ratio as more and more similar files are added.
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Note also that compression is enabled at the zfs file system level but copying an already gzipped file will not result in further gains – the value returned by zfs get compressratio labpool/archive stays at 1.00x.
ZFS Snapshots
zfs snapshot -r labpool/archive@snap1 && zfs list -r -t all labpool
zfs rollback labpool/archive/a@snap1
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Snapshots can be created that copy-on-write (or any other kind of IO) such that changes made can be rolled back. As a result, snapshots don’t take up a lot of space, unless left in place for filesystems with high IO of course.
ZFS Clones
zfs clone labpool/archive/a@snap1 labpool/a_work
zfs list -r -t all labpool
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zfs list -r -t all labpool will show all the zfs filesystems including snapshots and clones. Changes can be made to the clone filesystem without affecting the original.
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