slow ZFS on FreeBSD 8.1

Matthew Seaman m.seaman at
Thu Dec 30 14:07:46 UTC 2010

On 30/12/2010 12:20, Dan Langille wrote:
> On 12/30/2010 4:00 AM, Matthew Seaman wrote:
>> On 30/12/2010 00:56, Dan Langille wrote:

>> Yes, if you're booting from ZFS and you're using gpt to partition the
>> disks, as described at
>> et seq. That's probably the most common way of installing FreeBSD+ZFS in
>> use today.

> The reason I've not installed ZFS on root is because of the added
> complications.  I run the OS on ufs (with gmirror) and my data is on
> ZFS.   We must be hanging out with different groups.  Most of the people
> I know don't have ZFS on root.

Hmmm... well, complication is in the eye of the beholder.  Installing
root on ZFS is more work, certainly.  Mostly because sysinstall doesn't
support it (but the PC-BSD installer does).  Once it is set up, it's no
more bother than root on UFS during normal use, and personally I'd say a
pure ZFS system is simpler and cleaner than a hybrid UFS/ZFS setup[*].

The whole deal with updating gptzfsloader is a thing you only need to
worry about on rare occasions; typically only during version upgrades.
Unless you're tracking a dev branch or running experimental code.
8.1-RELEASE has v13.  8.2-RELEASE will have v15.  9.0 and 8.3 will
probably have v28 -- it's anybodies' guess after that, given Oracle's
actions over OpenSolaris.



[*] There's a good argument for a system with root on ZFS and data on
UFS, as a DB server -- ZFS is not the best performing filesystem for the
sort of small randomly located IOs that RDBMSes generate.

Dr Matthew J Seaman MA, D.Phil.                   7 Priory Courtyard
                                                  Flat 3
PGP:     Ramsgate
JID: matthew at               Kent, CT11 9PW

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