zfs discuss - Sep 2010 - recordsize

What are the ramifications to changing the recordsize of a zfs filesystem that
already has data on it?

I want to tune down the recordsize to speed up very small reads to a size that
is more in line with the read size. can I do this on a filestystem that has data
already on it and how does it effect that data? zpool consists of 8 SANs Luns.

Thanks
mike
-- 
This message posted from opensolaris.org

On Thu, Sep 16, 2010 at 8:21 AM, Mike DeMarco <mikejd42 at yahoo.com>
wrote:
> What are the ramifications to changing the recordsize of a zfs filesystem
that already has data on it?
>
> I want to tune down the recordsize to speed up very small reads to a size
that is more in line with the read size.
> can I do this on a filestystem that has data already on it and how does it
effect that data? zpool consists of 8 SANs Luns.
Changing any of the zfs properties only affects data written after the
change is made.  Thus, reducing the recordsize for a filesystem will
only affect newly written data.  Any existing data is not affected
until it is re-written or copied.


-- 
Freddie Cash
fjwcash at gmail.com