Category Archives: ZFS

Anything related to ZFS

When to create a ZFS filesystem?

Someone named “Edward M” posted on the freebsd-questions mailing list a question of when should we create a ZFS filesystem. I didn’t reply to any of the messages, but I decided to write this post expressing my view.

In short, whenever a part of the filesystem hierarchy exhibits different characteristics, create one or more ZFS filesystems for that particular subtree. Continue reading When to create a ZFS filesystem?

Resizing mirrored ZFS root pool

George Mamalakis was having trouble with ZFS not detecting and utilizing his resized GPT freebsd-zfs partitions. Marco van Tol came to the rescue with a corrective procedure.

Credit goes to George Mamalakis for raising the issue and to Marco van Tol for the solution. I’m just a simple bystander in comparison to these two, fine gentlemen.

Below are my notes from a simple experiment performed late this evening demonstrating one way of making ZFS grow its pool size. The experiment is based on George Mamalakis’ setup as explained in his post linked above. Note, some system administrator’s liberty has been applied. Continue reading Resizing mirrored ZFS root pool

New server and first attempt at running FreeBSD/amd64 with ZFS for all storage

The switch to new hardware finally happened. This is the first server to run FreeBSD/amd64 under my supervision. ZFS is used for all storage on this server. I chose to install the newly released FreeBSD/amd64 9.0-RELEASE, before upgrading to FreeBSD/amd64 9.0-STABLE by source. It’s just a matter of preference, given my 13-14 years of experience with FreeBSD. Continue reading New server and first attempt at running FreeBSD/amd64 with ZFS for all storage

ZFS root fs on FreeBSD 9.0

Gone are the old MFS root fs image and the sysinstall utility. To create a useable ZFS root fs from the 9.0-RELEASE DVD we must specify an alternate location for the temporary zpool.cache file and an alternate mountpoint for the ZFS root fs by using a command like:

zpool create -o cachefile=/tmp/zpool.cache -m /tmp/zroot zroot /dev/gpt/disk0

Also, the FreeBSD distribution is now stored as a handful of xz compressed tar files in /usr/freebsd-dist on the DVD. Everything else remain largely the same. The instructions below also apply to 9.1-RELEASE.

See and for further details.

Keep on reading if you want my recipe for creating a ZFS root fs. Continue reading ZFS root fs on FreeBSD 9.0